Journal articles on the topic 'Seismic area'
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Kamiludin, Udaya, I. Nyoman Astawa, and Moch Akrom Mustafa. "INDIKASI KETERDAPATAN ENDAPAN PLASER PEMBAWA TIMAH DAN UNSUR TANAH JARANG (REE), DI PERAIRAN TODAK, SINGKEP, KEPULAUAN RIAU." JURNAL GEOLOGI KELAUTAN 13, no. 2 (February 16, 2016): 109. http://dx.doi.org/10.32693/jgk.13.2.2015.266.
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Penelitian geofisika di Perairan Todak, Singkep, Kepulauan Riau menggunakan seperangkat peralatan seismik pantul dangkal saluran tunggal. Tujuan penelitian ini adalah untuk menunjang penelitian keterdapatan endapan plaser pembawa timah dan unsur tanah jarang (REE). Hasil interpretasi rekaman seismik diperoleh terdapatnya lembah/mangkuk yang terbentuk secara alami akibat adanya terobosan batuan granit, di mana lembah/mangkuk-mangkuk ini merupakan tempat terjadinya sedimentasi dari hasil pelapukan batuan di sekitarnya. Hasil interpretasi rekaman seismik pantul saluran tunggal analog di perairan Todak, Singkep, dapat diklasifikasikan menjadi 3 runtunan yaitu runtunan A, B, dan runtunan C.Kata kunci Data seismik, endapan plaser, lembah/mangkuk, Perairan Todak. Geophysical research at Todak, Singkep, Riau Archipelago Province, by using single channel sahllow seismic refletion. The purpose of research is to support placer deposit bearing tin and rare earth element research at this area. From seismic interpretation can be recognized the distribution of valley/bowls which is naturally formed, caused by granite rock intrusion. Those valleys are sedimentation places of wheathered rock from the surrounding area. Beside that, the seismic research also for determining the placer deposit thickness. Interpratation of analog single channel seismic records in the Todak waters, Singkep, result 3 seismic sequences and intrusive feature, A sequences, B, and C. Keywords: Seismic data, placer deposit, valley/basin, Todak Watres.
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Iswanto, Eko Rudi, Theo Alvin Riyanto, and Hadi Suntoko. "Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat." EKSPLORIUM 42, no. 1 (May 31, 2021): 39. http://dx.doi.org/10.17146/eksplorium.2021.42.1.6243.
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ABSTRAK Provinsi Nusa Tenggara Barat (NTB) merupakan daerah dengan aktivitas kegempaan yang tinggi. Fenomena ini disebabkan oleh adanya aktivitas tektonik sebagai akibat pertemuan Lempeng Eurasia-Australia (zona subduksi) di bagian selatan dan Sesar Flores di bagian utara serta adanya keberadaan sesar-sesar lokal. Terkait dengan rencana pengembangan kawasan Samota di Pulau Sumbawa, NTB, perlu dilakukan suatu kajian kegempaan. Tujuan penelitian ini adalah memetakan indeks kerentanan seismik (Kg) melalui pengukuran mikrotremor dengan analisis menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR). Hasil penelitian berupa peta kerentanan seismik daerah Plampang yang menunjukkan bahwa sisi utara lokasi penelitian memiliki indeks kerentanan seismik rendah yang ditandai dengan nilai amplifikasi kurang dari tiga jika dibandingkan daerah lainnya. Geologi sisi utara lokasi penelitian tersusun oleh batuan gunung api dengan karakteristik batuan keras, ketebalan sedimen sangat tipis, dan tersusun atas batuan Tersier atau lebih tua. Peta kerentanan seismik berguna sebagai acuan dalam mitigasi gempa bumi untuk mengurangi risiko yang ditimbulkan. ABSTRACT Nusa Tenggara Barat (NTB) Province is an area with intense seismic activity. This phenomenon is caused by tectonic activity as the result of the convergency of the Eurasia-Australia Plates (subduction zone) in the south and the Flores Fault in the north as well as the presence of local faults. Regarding the plan to develop the Samota area in Sumbawa Island, NTB, a study concerning earthquakes should be done. The purpose of this study is to map the seismic vulnerability index (Kg) through microtremor measurement by using the Horizontal to Vertical Spectral Ratio (HVSR) analysis method. The result of the study is a seismic vulnerability map of the Plampang area which its northern part has a low seismic vulnerability index indicated by the amplification factor value of less than three compared to other areas. The geology of the northern part of the Plampang area consists of volcanic rocks which has hard rock characteristic, very thin sediment thickness, and composed of Tertiary or older rocks. Seismic vulnerability maps can be useful as a reference for earthquake mitigation to reduce its risks.
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Miharno, Fatimah. "ANALISA POTENSI MINYAK DAN GAS BUMI DENGAN ATRIBUT SEISMIK PADA BATUAN KARBONAT LAPANGAN *ZEFARA* CEKUNGAN SUMATRA SELATAN." KURVATEK 1, no. 2 (May 23, 2017): 21–31. http://dx.doi.org/10.33579/krvtk.v1i2.250.
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ABSTRACT*Zefara* Field formation Baturaja on South Sumatra Basin is a reservoir carbonate and prospective gas. Data used in this research were 3D seismik data, well logs, and geological information. According to geological report known that hidrocarbon traps in research area were limestone lithological layer as stratigraphical trap and faulted anticline as structural trap. The study restricted in effort to make a hydrocarbon accumulation and a potential carbonate reservoir area maps with seismic attribute. All of the data used in this study are 3D seismic data set, well-log data and check-shot data. The result of the analysis are compared to the result derived from log data calculation as a control analysis. Hydrocarbon prospect area generated from seismic attribute and are divided into three compartments. The seismic attribute analysis using RMS amplitude method and instantaneous frequency is very effective to determine hydrocarbon accumulation in *Zefara* field, because low amplitude from Baturaja reservoir. Low amplitude hints low AI, determined high porosity and high hydrocarbon contact (HC). Keyword: Baturaja Formation, RMS amplitude seismic attribute, instantaneous frequency seismic attribute
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Lizurek, Grzegorz, Jan Wiszniowski, N. V. Giang, D. Q. Van, L. V. Dung, V. D. Tung, and Beata Plesiewicz. "Background seismicity and seismic monitoring in the Lai Chau reservoir area." Journal of Seismology 23, no. 6 (October 25, 2019): 1373–90. http://dx.doi.org/10.1007/s10950-019-09875-6.
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Abstract Reservoir-triggered seismic activity depends not only on the technical characteristics of the future reservoir (filling volume, the height of water column) but also on the seismo-tectonics and the natural seismic processes occurring in the area before construction of an artificial reservoir. Passive seismic monitoring was realised near Lai Chau (Vietnam) before the impoundment started. It allowed exploration of the natural seismicity in the area of the future dam. Locations of seismic events several months prior to the reservoir impoundment were observed with ten stations installed in the reservoir vicinity. Events were mainly located near the dam along the Da river headwaters fault. However, only four stations were available for the entire period before the impoundment. Despite the network limitations, completeness of seismic catalogue and b value were determined and may be used as a baseline for analysis of the seismicity in this area after impoundment. The magnitude completeness level is significantly smaller than in the broader seismogenic zones covering an area of the dam. The b value differs from the results obtained for regional seismicity of Northeastern Vietnam. The capability of the local network for moment tensor inversion was estimated with the use of synthetic data tests. Test results provided the requirements for the station number according to azimuthal coverage of the network to obtain the reliable full moment tensor (MT) solution. Preliminary analysis of the seismic activity after Lai Chau reservoir impoundment indicates some changes in activity related to the impoundment and reservoir exploitation.
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Drogreshka, Katerina, Dragana Chernih, and Jasmina Najdovska. "SEISMICITY OF DEBAR EPICENTRAL AREA." Knowledge International Journal 28, no. 4 (December 10, 2018): 1245–50. http://dx.doi.org/10.35120/kij28041245k.
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Main neotectonic regions in the territory of the Republic of Macedonia are the Vardar zone, West Macedonia and East Macedonia. These regions, being developed within major, regional tectonic units, are permanently uplifting with different intensities. They also show differences in the seismic activity, which is the reason to treat them as separate seismic zones, named with the same names. Debar epicentral area belongs to the West Macedonia seismic zone. This epicentral area is presented by the sinking of Drim graben (valley), crisscrossed by neotectonic faults which coused strong earthquake in 1967y, with Richter magnitude ML=6.5 and intensity Io=IX degrees EMS–1998 scale. After 1900y several moderate (5.0≤ML≤5.9) and light (4.0≤ML≤4.9) and lot of small earthquakes with magnitude ML ≤3.9 are also observed. According to all instrumental data, our latest investigation of seismic activity parameters for this epicentral area pointed out the activity of Elbasan-Debar fault.
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Angove, Ron. "THE POINT TORMENT SEISMIC SURVEY: A SEMI-PORTABLE SEISMIC OPERATION." APPEA Journal 25, no. 1 (1985): 248. http://dx.doi.org/10.1071/aj84021.
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Point Torment, an area of low-lying tidal mudflats and adjacent coastal peninsula, was the site of a seismic survey unique to Australian geophysical exploration. This survey was conducted by Esso Australia Ltd and the area, part of EP 104, is located north of the township of Derby in Western Australia.Surface conditions in the area varied from thickly wooded grassland on the peninsula to open mudflats. Vehicle access to the mudflats was severely restricted and helicopter support was necessary to maintain the seismic operation throughout. The operation was extremely labour intensive; for example, line-cutting through mangrove areas was carried out by hand.Seismic recording was achieved using an OPSEIS* 5500 digital radio telemetry system. With this system data is collected by portable field units labelled Remote Telemetry Units (RTU's) and subsequently retrieved by Radio telemetry and permanently stored on magnetic tape by a Central Recording Station (CRS). This was the first instance of this system being employed in Australia.
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Astawa, Nyoman, Priatin Hadi Widjaja, and Wayan Lugra. "POLA SEBARAN GAS CHARGED SEDIMENT DASAR LAUT DI PERAIRAN SIDOARJO JAWA TIMUR." JURNAL GEOLOGI KELAUTAN 9, no. 2 (February 16, 2016): 65. http://dx.doi.org/10.32693/jgk.9.2.2011.201.
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Gas charged sediment dalam rekaman seismik dicirikan oleh tidak adanya gambar pantul dalam (free reflector), karena gas charged sediment merupakan media penyerap energi. Dari hasil penafsiran rekaman seismik dapat dibuat Peta Pola Sebaran Gas Charged sediment di daerah penelitian. Pola sebaran gas charged sediment di daerah penelitian cukup luas yaitu mulai dari Perairan Sukolilo hingga ke muara Kali Porong. Di bagian selatan daerah penelitian (L-12), sebaran gas charged sediment relatif lebih luas jika dibandingkan dengan di bagian utara (L-19).
Kata kunci : seismik, penafsiran, peta pola sebaran gas charged
In the seismic record gas charged is characterized by free reflectors, because the gas charged is an energy absorber media. From the interpretation of the seismic record, the maps of gas charged distribution pattern in the study area can be created. Gas charged distribution pattern in the study area is extend from Sukolilo Waters to the estuary of Porong River. In the soothern part of the study area (L-12), the distribution of gas charged is relatively broader than in the northern part (L-19).
Keywords: seismic, interpretation, map distribution pattern of biogenic gas
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Woo, Gordon. "Seismic area zones: myth or reality?" Terra Nova 6, no. 5 (September 1994): 535–36. http://dx.doi.org/10.1111/j.1365-3121.1994.tb00897.x.
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Xie, Zhuo Juan, and Yue Jun Lu. "Determination of the Spatial Distribution Function of Bohai Seismic Tectonic Area." Advanced Materials Research 1065-1069 (December 2014): 1530–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1530.
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The spatial distribution function assigns seismicity parameters of seismic zone and belt to the potential earthquake source area seismic by the magnitude interval, determination of the spatial distribution function is one of the key technologies to comprehensive probabilistic seismic hazard analysis methods, and the results will directly influence seismic hazard analysis results of the calculated sites. However, the spatial distribution functions are hard to get by statistics due to serious lack of seismic samples, and evaluation factors used in the actual work are too complex and not independent, the spatial distribution function is lack of reliability. In this paper, Bohai seismic tectonic area is chosen as an example; geological data are obtained from the newly built offshore oil platform engineering in recent decades, while seismic activity data are obtained by checking from historical difficult seismic parameters. Five factors are adopted in this area, including potential seismic focus area, seismic tectonic, seismic activity level, long-term forecasts, and strong earthquake recurrence interval and construct empty segment. Spatial distribution function of Bohai Sea earthquake structure area is obtained by weighted comprehension; it reflects the spatial and temporal heterogeneity of seismic activities in the area, and provides the calculation parameters for the probabilistic seismic hazard analysis.
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Suarez, Gabriela. "Designing 3D seismic surveys in the Macal area using seismic modeling." Leading Edge 23, no. 10 (October 2004): 1071–76. http://dx.doi.org/10.1190/1.1813361.
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Hinds, Ronald C., Neil L. Anderson, and Richard Kuzmiski. "An integrated surface seismic/seismic profile case study: Simonette area, Alberta." GEOPHYSICS 58, no. 11 (November 1993): 1676–88. http://dx.doi.org/10.1190/1.1443383.
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On the basis of conventional surface seismic data, the 13–15–63–25W5M exploratory well was drilled into a low‐relief Leduc Formation reef (Devonian Woodbend Group) in the Simonette area, west‐central Alberta, Canada. The well was expected to intersect the crest of the reef and encounter about 50–60 m of pay; unfortunately it was drilled into a flank position and abandoned. The decision to abandon the well, as opposed to whipstocking in the direction of the reef crest, was made after the acquisition and interpretive processing of both near( and far‐offset (252 and 524 m, respectively) vertical seismic profile (VSP) data, and after the reanalysis of existing surface seismic data. The near‐ and far‐offset VSPs were run and interpreted while the drill rig remained on‐site, with the immediate objectives of: (1) determining an accurate tie between the surface seismic data and the subsurface geology; and (2) mapping relief along the top of the reef over a distance of 150 m from the 13–15 well location in the direction of the adjacent productive 16–16 well (with a view to whipstocking). These surveys proved to be cost‐effective in that the operators were able to determine that the crest of the reef was out of the target area, and that whipstocking was not a viable alternative. The use of VSP surveys in this situation allowed the operators to avoid the costs associated with whipstocking, and to feel confident with their decision to abandon the well.
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Ramanna, C. K., and G. R. Dodagoudar. "Impact Analysis of Seismic Source Area Extent on Hazard Estimate for Chennai City." International Journal of Geotechnical Earthquake Engineering 5, no. 1 (January 2014): 75–100. http://dx.doi.org/10.4018/ijgee.2014010105.
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The present work is intended to study the effect of variation of seismic area source zone on hazard value for Chennai, India. In the conventional Cornell-McGuire approach to probabilistic seismic hazard analysis, the seismic activity rate for an area source is most often determined using the Gutenberg-Richter (G-R) recurrence law. The seismic area is delineated using geology, geography and/or seismotectonic characteristics of the region. However if the area lies in a distributed seismicity region, the delineation into different area zones introduces subjectivity. The impact of the areal extent of seismic area zone on the final hazard value is studied using two approaches - the conventional Cornell-McGuire and zone-free approaches. It is observed that in the conventional Cornell-McGuire approach, the peak ground acceleration decreases when the area source zone is increased while maintaining all other seismicity parameters same. In the kernel method, the PGA remained unchanged though the seismic source area is increased. This is due to the fact that in the kernel method, the seismic activity rate is a spatially varying parameter unlike the seismic activity rate determined from the G-R recurrence law, which assumes a homogeneous distribution of the activity rate for each of the area source zones. The uniform hazard spectra are obtained for various return periods by both the approaches. It is observed that in the Cornell-McGuire approach, the variation in the extent of seismic source area has little effect on longer return periods as compared to the smaller return periods.
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Rahardiawan, Riza, and Catur Purwanto. "STRUKTUR GEOLOGI LAUT FLORES, NUSA TENGGARA TIMUR." JURNAL GEOLOGI KELAUTAN 12, no. 3 (February 16, 2016): 153. http://dx.doi.org/10.32693/jgk.12.3.2014.256.
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Tujuan penelitian seismik saluran banyak di Laut Flores, Nusa Tenggara Timur adalah untuk mengetahui kondisi geologi bawah permukaan dasar laut. Daerah penelitian merupakan daerah yang aktif secara tektonik dan diekspresikan dalam bentuk prisma akresi, vulkanik tidak aktif dan sesar-sesar aktif yang membentuk morfologi dasar laut. Berdasarkan penafsiran stratigrafi seismik lapisan bawah permukaan dasar laut terdiri dari empat satuan batuan: Batuan Dasar, Prisma Akresi, Gunungapi Bawah Laut, dan Sedimen Klastika. Sedimen Klastika ini dibagi menjadi lima unit.
Kata kunci: seismik, morfologi dasar laut, sesar aktif, Laut Flores
The purpose of the study of seismic multi channel in Flores Sea, East Nusa Tenggara is to recognize subsurface geology condition. The study area is an active tectonic that expressed by accretion prisms, inactive vulcanic and active faults form seabed morphology. Based on seismic stratigraphy interpretation, the study area is composed of four rocks units: Basement rocks, Accretionary Wedge, Seamount, and Clastic Sediments. This clactic sediment is divided into five units.
Keywords: seismic, seabed morphology, active fault, Flores Sea
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Weichert, Dieter. "Seismic acceleration zones in the Vancouver area." Canadian Journal of Civil Engineering 21, no. 2 (April 1, 1994): 351–53. http://dx.doi.org/10.1139/l94-035.
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Since 1990, an increased number of locations for the Lower Mainland of British Columbia has been listed in the Table of Climatic Data in the Supplements to the National Building Code of Canada. While for most of the new locations the seismic acceleration and velocity zones are shown as Za = Zv = 4, Ladner is listed with Za = 5, leading to significant cost increase in the construction of certain types of buildings. Although the zonal value is formally correct, it is suggested that such discrimination is not justified by the current precision of seismic hazard estimation.The Canadian National Committee on Earthquake Engineering does not address regional variances of this nature; it is, therefore, further suggested that a regional committee should decide on an equitable solution, with due consideration of estimated probabilities of exceeding ground motion parameters, and the precision of these estimates. Some of the background and details aiding such a decision are discussed. Key words: seismic hazard, acceleration, seismic zones, earthquake design, Vancouver acceleration.
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Aydin, Ali, Erdal Akyol, Mahmud Gungor, Nuray Soyatik, and Suat Tasdelen. "Seismic Microzonation for Denizli Metropolitan Area, Turkey." Applied Mechanics and Materials 802 (October 2015): 40–44. http://dx.doi.org/10.4028/www.scientific.net/amm.802.40.
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This study presents microzonation of the Denizli city center, is about 225 km2. It is mainly rely on t seismic velocities of the tested soil. For seismic microzonation area of has been selected as the study area. Seismic refraction methods have been used to generate two-dimensional profiles at 310 locations. These p and s wave velocities are used to estimate boundaries of the velocities at every 2 and 5 m intervals up to a depth of 60 m. The results are satisfactory for urban planning and it can successfully be used in urban areas. The municipal authority may be considered to use the results for land use studies.
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Paramonov, S. S., D. Z. Kappushev, T. A. Manukyan, Kh Yu Evloyev, and E. A. Barseghyan. "Man-made seismicity in the area of the Leninskoye coal deposit." Mining Industry Journal (Gornay Promishlennost), no. 6/2022 (January 15, 2023): 131–36. http://dx.doi.org/10.30686/1609-9192-2022-6-131-136.
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The paper presents an analysis of seismotectonic conditions in the area of the Leninskoye coal deposit (Kuzbass). The territory of the Leninskiy district is belongs to the coverage zone of the Altai-Sayan regional seismic stations network. The results of research into intensification of seismic activity in the Kuzbass region using the local networks of seismic stations are considered. In the course of seismic observations in the territory of the Kemerovo region four seismically active zones been identified that encircle the largest industrial megacities of Kuzbass and that are responsible for 90% of the earthquake foci. According to the distribution of epicenters of the seismic events, the area of the Leninskoe coal deposit belongs to one of the seismic zones with the most actively developing natural and man-made seismic activity identified within the research. The research indicates that the induced seismic activity in Kuzbass prevails over the natural seismicity.
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Sari, Anggun Mayang, and Afnindar Fakhrurrozi. "SEISMIC HAZARD MICROZONATION BASED ON PROBABILITY SEISMIC HAZARD ANALYSIS IN BANDUNG BASIN." RISET Geologi dan Pertambangan 30, no. 2 (December 30, 2020): 215. http://dx.doi.org/10.14203/risetgeotam2020.v30.1138.
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The geological and seismic-tectonic setting in the Bandung Basin area proliferates the seismicity risk. Thus, it is necessary to investigate the seismic hazards caused by the foremost seismic source that affects the ground motions in the bedrock. This research employed Probability Seismic Hazard Analysis (PSHA) method to determine the peak ground acceleration value. It considers the source of the earthquakes in the radius of 500 km with a return period of 2500 years. The analysis results showed that the Peak Ground Acceleration (PGA) in this region varies from 0.46 g to 0.70 g. It correlates with the magnitude and hypocentre of the dominant earthquake source of the study locations. The PGA value on the bedrock was used as an input to develop the seismic hazard microzonation map. It was composed using the Geographic Information System (GIS) to visualise the result. This research provides a scientific foundation for constructing residential buildings and infrastructure, particularly as earthquake loads in the building structure design calculations. ABSTRACT - Mikrozonasi Bahaya Seismik Berdasarkan Probability Seismic Hazard Analysis di Cekungan Bandung. Kondisi geologi dan seismik-tektonik di Cekungan Bandung meningkatkan risiko kegempaan di wilayah tersebut. Oleh karena itu, perlu dilakukan penelitian tentang bahaya seismik yang disebabkan oleh sumber-sumber gempa di sekitarnya yang mempengaruhi gelombang gempa di batuan dasar. Penelitian ini menggunakan metode Probability Seismic Hazard Analysis (PSHA) untuk menentukan nilai percepatan gelombang gempa di batuan dasar. Lebih lanjut penelitian ini menggunakan sumber gempa dalam radius 500 km dengan periode perulangan 2500 tahun. Hasil analisis menunjukkan bahwa Peak Ground Acceleration (PGA) di wilayah ini bervariasi dari 0,46 g hingga 0,70 g. Hal ini berkorelasi dengan magnitudo dan jarak hiposenter sumber gempa dominan terhadap lokasi penelitian. Nilai PGA di batuan dasar digunakan sebagai input data dalam pembuatan peta mikrozonasi bahaya seismik. Peta mikrozonasi bahaya seismik disusun dan divisualisasikan menggunakan Sistem Informasi Geografis (SIG). Luaran penelitian ini menghasilkan landasan ilmiah pada konstruksi bangunan tempat tinggal dan infrastruktur, khususnya sebagai pembebanan gempa dalam perhitungan desain struktur bangunan.
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Kopenetz, Lajos György, Alíz Éva Máthé, and Ferdinánd-Zsongor Gobesz. "Seismic Design Isues." Műszaki Tudományos Közlemények 11, no. 1 (October 1, 2019): 117–20. http://dx.doi.org/10.33894/mtk-2019.11.25.
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Abstract Earthquake zones cover a significant part of our earth, therefore, when planning and designing residential areas, factories, or other human establishments, professionals have to take into account the seismic hazard of that area. The current earthquake standard in Romania is based on the European code. This paper presents, beside the most significant structural composition rules, the applicable methods that can be used to ensure sufficient load bearing requirements.
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Liu, Cheng Bin, Ya Ling Ou, Xing Chen Dong, Yi Kui Zhang, Xiang Xiang Zhang, Kai Deng, Li Yuan Deng, Lin Chen, Shan Huang, and Mei Yan Ren. "Study on the Seismic Performance of Rural Buildings in Beijing Area." Applied Mechanics and Materials 353-356 (August 2013): 2397–401. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2397.
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Wenchuan earthquake caused huge losses in rural areas. The subject briefly introduced the earthquake damage characteristics of masonry structures, analyzed the earthquake damage reasons. The main purpose is to propose some measures to improve the seismic capacity of rural buildings in Beijing area. Through two seismic fortification measures, can effectively enhance the integrity of the masonry structure, reduce the seismic response, effectively improve the seismic capacity of the structure.
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Baba Hamed, Fatima Zohra, Driss Djaouad Rahal, and Farid Rahal. "SEISMIC RISK ASSESSMENT OF ALGERIAN BUILDINGS IN URBAN AREA." Journal of Civil Engineering and Management 19, no. 3 (June 14, 2013): 348–63. http://dx.doi.org/10.3846/13923730.2012.744772.
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The recent earthquakes in Algeria have caused significant human and economic losses. The frequent occurrence of damaging earthquakes clearly demonstrates the urgent need of study on seismic risk assessment methods of buildings to effectively reduce the impact of earthquake in Algerian cities. This article contributes to the development and the application of a seismic risk method, appropriate to Algerian building specificities. This method considers five damage levels, defined accordingly to macroseismic intensity and the seismic quality of the building by means of a vulnerability index. The present paper summarises the development of a tool to integrate seismic hazard and structural information and support the decision making process in identification of seismic risk. This tool could be used in the inspection of buildings and the optimal prioritisation of strengthening and preventives remedial actions that are necessary prior to a major earthquake event.
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Wibowo, Sandy Nur Eko, As'ari ., and Slamet Suyitno Raharjo. "Analisis Daerah Dugaan Seismic Gap di Sulawesi Utara dan sekitarnya." Jurnal MIPA 3, no. 1 (March 2, 2014): 53. http://dx.doi.org/10.35799/jm.3.1.2014.3908.
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Seismic gap adalah kawasan yang aktif secara tektonik namun sangat jarang mengalami gempabumi dalam jangka waktu yang lama. Terdapat dua daerah dugaan seismic gap yang terdapat di daerah Sulawesi Utara antara lain daerah Laut Maluku dan Laut Sulawesi. Pada penelitian ini akan dianalisis sejauh mana potensi bahaya dua daerah dugaan seismic gap tersebut didasarkan pada profil perubahan parameter seismotektonik nilai b, analisis mekanisme fokus, perubahan nilai rasio vp/vs, periode ulang gempabumi dan prediksi parameter patahan di dua daerah penelitian. Diperoleh bahwa hanya daerah dugaan seismic gap di Laut Maluku yang dapat dikategorikan sebagai daerah seismic gap yang berpotensi menimbulkan gempabumi dengan energi besar dan tsunami sebagai efek terusan gempabumi.Seismic gap is a tectonically active region, but very rarely experienced earthquakes in the long term. There are two alleged seismic gap area of the North Sulawesi region, that are Maluku Sea and the Sulawesi Sea areas. This research analyzed potential danger of the two alleged seismic gap area in North Sulawesi based on b value seismotectonic profile parameter changes, the analysis of the focal mechanism, changes in the value of the ratio vp/vs, earthquake recurrence period, and fault parameters prediction at the two areas. It was found that the alleged area of Maluku Sea could be categorized as a seismic gap area with a potentially earthquake and tsunami energy which was the after effects of the earthquake.
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Zhang, Hang, Xie Dong Zhang, and Jin Tian Wang. "Analysis of Viscous Dampers for Continuous Bridge in Meizoseismal Area." Applied Mechanics and Materials 353-356 (August 2013): 2149–52. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2149.
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Continuous bridges jolted the public attention into the awareness of the seismic vulnerability due to its wide application in bridge engineering. Viscous dampers can effectively improve the seismic performance of continuous bridge. In this paper, taking the Yellow River Bridge located in seismic region with intensity VIII as an example, the influence of the damping coefficient and velocity exponent of the damper on seismic responses of the bridge are carried out in detail. The applicable model parameters are also presented.
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Rodrigues, M. C. M., and C. S. Oliveira. "Seismic zones for Azores based on statistical criteria." Natural Hazards and Earth System Sciences 13, no. 9 (September 24, 2013): 2337–51. http://dx.doi.org/10.5194/nhess-13-2337-2013.
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Abstract. The objective of this paper is to define seismic zones in the Azores based on statistical criteria. These seismic zones will likely be used in seismic simulations of occurrences in the Azores Archipelago. The data used in this work cover the time period from 1915 to 2011. The Azores region was divided into 1° × 1° area units, for which the seismicity and the maximum magnitudes of events were calculated. The seismicity, the largest earthquakes recorded and the geological characteristics of the region were used to group these area units because similar seismic zones must delineate areas with homogeneous seismic characteristics. We have identified seven seismic zones. To verify that the defined areas differ statistically, we considered the following dissimilarity measures (variables): time, size and seismic conditions – the number of seismic events with specific characteristics. Statistical tests, particularly goodness-of-fit tests, allowed us to conclude that, considering these three variables, the seven earthquake zones defined here are statistically distinct.
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Karakaisis, G. F., C. B. Papazachos, and E. M. Scordilis. "SEISMIC SOURCES AND MAIN SEISMIC FAULTS IN THE AEGEAN AND SURROUNDING AREA." Bulletin of the Geological Society of Greece 43, no. 4 (January 25, 2017): 2026. http://dx.doi.org/10.12681/bgsg.11393.
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A seismic source is defined, in the present work, as the part of the seismogenic layer of theearth’s crust with a circular horizontal dimension (E, R), where E is the epicenter of the largestearthquake (mainshock) ever occurred in this seismic source and radius equal to the half faultlength of this largest earthquake (R=L/2). In addition to foreshocks and aftershocks othersmaller mainshocks occur in other smaller faults of this source or in parts of the main fault.All available historical and instrumental data concerning strong (M³6.0) shallow (h≤60 km) andintermediate depth (60km<h≤100km) shocks which occurred in the Aegean area between 464B.C. and 2008 are used in the present work in an attempt to identify the seismic sources in thisarea, as well as to determine the basic parameters of the largest fault in each source. A particularprocedure is followed to identify 155 seismic sources in this area and determine thebasic parameters of the largest fault in each source. Declustering has been also performed todefine mainshocks in the Aegean area and the completeness of this mainshock catalogue hasbeen determined. Results are summarized in table (1).
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Senatorski, Piotr. "Effect of seismic moment–area scaling on apparent stress–seismic moment relationship." Physics of the Earth and Planetary Interiors 196-197 (April 2012): 14–22. http://dx.doi.org/10.1016/j.pepi.2012.02.001.
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Zhao, Chongxu, Lunqiang Yao, Shichao Hou, Yantao Zhu, Hao Gu, and Bo Li. "Seismic finite element analysis of tailings dam in high seismic intensity area." IOP Conference Series: Earth and Environmental Science 525 (July 7, 2020): 012057. http://dx.doi.org/10.1088/1755-1315/525/1/012057.
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Zhou, Qi, and Wen Long Ding. "Seismic Reservoir Prediction in Lengjia-Leijia Area." Applied Mechanics and Materials 318 (May 2013): 428–31. http://dx.doi.org/10.4028/www.scientific.net/amm.318.428.
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Through the deep exploration in Lengjia-Leijia area, four reservoirs were found: the lower sub-section of the third member of Shahejie formation, the fourth member of Shahejie formation, Mesozoic, and Archean. The fourth member of Shahejie formation and the layer below it had fewer drilling reach; its reservoir stratums are different. Seismic reservoir prediction has become the major means of oil-gas reservoir evaluation. The logging-constrained inversion method was applied in this study. A geologic model was established based on the detailed interpretation of seismic data; then, inversion and prediction were performed to describe and evaluate the distribution, thickness, and physical characteristics of the reservoirs. The results showed that the reservoir in the fourth member of Shahejie formation, Mesozoic, and Archean are well developed, and that oil-gas accumulation is in good condition. Therefore, the deep layer in this area is an important exploration direction. This study also provided the preliminary prediction that a favorable trap area exists.
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Li, Changlong, and Mengtan Gao. "Seismic Hazard Model Harmonization in Tienshan Area." Journal of Risk Analysis and Crisis Response 9, no. 2 (2019): 74. http://dx.doi.org/10.2991/jracr.k.190703.003.
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Rivas-Medina, Alicia, Belen Benito, and Jorge Miguel Gaspar-Escribano. "Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain." Natural Hazards and Earth System Sciences 18, no. 11 (October 30, 2018): 2809–23. http://dx.doi.org/10.5194/nhess-18-2809-2018.
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Abstract. This paper presents a methodological approach to seismic hazard assessment based on a hybrid source model composed of faults as independent entities and zones containing residual seismicity. The seismic potential of both types of sources is derived from different data: for the zones, the recurrence model is estimated from the seismic catalogue. For fault sources, it is inferred from slip rates derived from palaeoseismicity and GNSS (Global Navigation Satellite System) measurements. Distributing the seismic potential associated with each source is a key question when considering hybrid zone and fault models, and this is normally resolved using one of two possible alternatives: (1) considering a characteristic earthquake model for the fault and assigning the remaining magnitudes to the zone, or (2) establishing a cut-off magnitude, Mc, above which the seisms are assigned to the fault and below which they are considered to have occurred in the zone. This paper presents an approach to distributing seismic potential between zones and faults without restricting the magnitudes for each type of source, precluding the need to establish cut-off Mc values beforehand. This is the essential difference between our approach and other approaches that have been applied previously. The proposed approach is applied in southern Spain, a region of low-to-moderate seismicity where faults move slowly. The results obtained are contrasted with the results of a seismic hazard method based exclusively on the zone model. Using the hybrid approach, acceleration values show a concentration of expected accelerations around fault traces, which is not appreciated in the classic approach using only zones.
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Zhang, Guanlong, Peng Xiang, Jinduo Wang, Tieliang Lyu, Yulei Qiao, Xueguo Chen, Kuihua Zhang, and Hongzhou Yu. "Geologic modeling study of foothill area of the Junggar Basin rim." Interpretation 6, no. 4 (November 1, 2018): SM19—SM26. http://dx.doi.org/10.1190/int-2018-0003.1.
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The varied terrain and complex subsurface structure in the foothill segment of fold and thrust belts results in low-quality seismic data. Therefore, a structural model built only on the basis of seismic will have low reliability and be nonunique. To solve these problems, we have developed a comprehensive modeling method for foothill zones that combines gravity, magnetic (MT), electric, and seismic data. Information from gravity, MT, electric, and seismic data is fully used in each step of modeling. This reduces the nonuniqueness and guarantees the rationality and reliability of the tectonic model. The core of this procedure is simultaneous joint inversing gravity, MT, electric, and seismic multiparameters, which improves the accuracy of velocity model and results in a higher quality of seismic image. The Hala’alate Mountain area in the Junggar Basin, western China, is chosen as the application place, and the process of modeling is evaluated in detail; the structural model is proven to be correct by drilling data. Our method is more accurate and reliable than methods only using seismic data to build a geologic model in foothill zones.
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Kusnida, Dida, and Tommy Naibaho. "LATE NEOGENE SEISMIC STRUCTURES OF THE SOUTH BATANTA BASIN, WEST PAPUA." BULLETIN OF THE MARINE GEOLOGY 29, no. 1 (February 15, 2016): 11. http://dx.doi.org/10.32693/bomg.29.1.2014.61.
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Study on multi-channel seismic records from South Batanta Basin, West Papua acquired during RV Geomarin III cruise in 2013 were aimed to invent and map geological aspects and for geo-tectonic and geological history studies. Seismic data indicate that sediment sequences which can be observed from our seismic system in the study area are characterized by pre-extension sediments (Lower Early Miocene-Upper Early Pliocene), syn-extension sediments (Lower Middle Pliocene-Upper Late Pliocene), post-extension sediments (Early Pleistocene), and syn-inversion sediments (Late Pleistocene-Recent) typical of the West Papua tectonic system. In the study area, sediment sequences are possibly characterized by clastical sedimentary cover such as slumps, debrites and turbidites.
Key words: South Batanta Basin, seismic sequence, tectonic, faults, clastical sediments.
Studi rekaman seismik multi kanal dari Cekungan Batanta Selatan, Papua Barat yang diperoleh selama pelayaran KR Geomarin III pada tahun 2013 bertujuan untuk menginventarisir dan memetakan aspek-aspek geologi serta untuk studi geo-tektonik dan sejarah geologi. Data seismik menunjukkan bahwa urutan sedimen yang dapat diamati dari sistem seismik di daerah studi ditandai oleh sedimen pra-ekstensi (Miosen Awal Bagian Bawah-Pliosen Awal Bagian Atas), sedimen syn-ekstensi (Pliosen Tengah Bagian Bawah-Pliosen Akhir Bagian Atas), sedimen post-ekstensi (Plestosen Awal), dan sedimen syn-inversi (Pleistosen Akhir-Resen) tipikal sistem tektonik Papua Barat. Di daerah studi, urutan sedimen dicirikan oleh sedimen penutup klastika kemungkinan berupa slump, debrit dan turbidit.
Kata kunci: Cekungan Batanta Selatan, sekuen seismik, tektonik, sesar, sedimen klastika.
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Ghimire, Sunita. "Probabilistic seismic hazard analysis of Nepal." Journal of Innovations in Engineering Education 2, no. 1 (March 1, 2019): 199–206. http://dx.doi.org/10.3126/jiee.v2i1.36676.
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Probabilistic seismic hazard analysis for Nepal has been carried out considering uniform density model. A detailed earthquake catalogue since 1255 A.D, within the rectangular area has been developed and historical earthquakes are plotted in the map of Nepal. Five hundred twenty eight numbers of areal sources are used within the study area to characterize the seismic sources. The completeness of the data has been checked by using Stepp's procedure. Seismicity in four regions of study area has been evaluated by defining 'a' and 'b' parameters of Gutenberg Richter recurrence relationship. Seismic hazard curve of Nepal for soft subsoil condition for 10% probability of exceedence in 50 years period i.e. for return period of 475 years has been plotted.
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Zhao, Lei, Chunyan Qu, Dezheng Zhao, Xinjian Shan, Han Chen, and Lian Liu. "InSAR Constrained Downdip and Updip Afterslip Following the 2015 Nepal Earthquake: New Insights into Moment Budget of the Main Himalayan Thrust." Remote Sensing 14, no. 2 (January 10, 2022): 306. http://dx.doi.org/10.3390/rs14020306.
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We use ALOS-2 and Sentinel-1 data spanning 2015–2020 to obtain the post-seismic deformation of the 2015 Mw 7.8 Nepal earthquake. ALOS-2 observations reveal that the post-seismic deformation was mainly distributed in four areas. A large-scale uplift deformation occurred in the northern subsidence area of the co-seismic deformation field, with a maximum uplift of ~80 mm within 4.5 yr after the mainshock. While in the southern coseismic uplift area, the direction of the post-seismic deformation is generally opposite to the co-seismic deformation. Additionally, two notable deformation areas are located in the region around 29° N, and near the MFT, respectively. Sentinel-1 observations reveal post-seismic uplift deformation on the north side of the co-seismic deformation field with an average rate of ~20 mm/yr in line-of-stght. The kinematic afterslip constrained by InSAR data shows that the frictional slip is distributed in both updip and downdip areas. The maximum cumulative afterslip is 0.35 m in downdip areas, and 0.2 m in the updip areas, constrained by the ALOS measurements. The stress-driven afterslip model shows that the afterslip is distributed in the downdip area with a maximum slip of 0.3 m during the first year after the earthquake. Within the 4.5 yr after the mainshock, the estimated moment released by afterslip is ~1.5174 × 1020 Nm,about 21.2% of that released by the main earthquake.
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Wang, Chih-Hao. "Does compact development promote a seismic-resistant city? Application of seismic-damage statistical models to Taichung, Taiwan." Environment and Planning B: Urban Analytics and City Science 47, no. 1 (April 18, 2018): 84–101. http://dx.doi.org/10.1177/2399808318770454.
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This study examines whether compact development promotes a seismic-resistant city. A statistical model is used to simulate seismic damages under four spatial structure scenarios for Taichung, Taiwan. The existing floor areas of various land uses are allowed to be reallocated for reshaping the spatial structure of the city. This provides an opportunity to find an urban structure that would best resist seismic impacts similar to what have occurred during the past 100 years. The results suggest a polycentric compact form for seismic mitigation. This form, derived from the vision of Taichung, would have less seismic damages by shifting floor areas from the city center to three proposed subcenters, far away from most seismic impacts. One weakness is the seismic impacts from the north. The results also reveal that a monocentric compact form would incur more damages because the downtown area is essentially seismic-vulnerable. This paper advocates the application of a stricter building code in the downtown area. The local government should also not render additional building bulk as an incentive for urban renewal.
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Wang, Zhenming, David T. Butler, Edward W. Woolery, and Lanmin Wang. "Seismic Hazard Assessment for the Tianshui Urban Area, Gansu Province, China." International Journal of Geophysics 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/461863.
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A scenario seismic hazard analysis was performed for the city of Tianshui. The scenario hazard analysis utilized the best available geologic and seismological information as well as composite source model (i.e., ground motion simulation) to derive ground motion hazards in terms of acceleration time histories, peak values (e.g., peak ground acceleration and peak ground velocity), and response spectra. This study confirms that Tianshui is facing significant seismic hazard, and certain mitigation measures, such as better seismic design for buildings and other structures, should be developed and implemented. This study shows that PGA of 0.3 g (equivalent to Chinese intensity VIII) should be considered for seismic design of general building and PGA of 0.4 g (equivalent to Chinese intensity IX) for seismic design of critical facility in Tianshui.
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Shivhare, Ashish Mohan, K. K. Pathak, and S. K. Dubey. "Parametric Seismic Analysis of Tall Buildings with Different Geometry and Constant Plan Area." Journal on Today's Ideas - Tomorrow's Technologies 2, no. 2 (December 5, 2014): 79–91. http://dx.doi.org/10.15415/jotitt.2014.22006.
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Ali, Kamal. "3D SEISMIC ATTRIBUTES INTERPRETATION OF ZUBAIR FORMATION IN AL-AKHAIDEIR AREA, SOUTHWESTERN KARBALA." Iraqi Geological Journal 53, no. 1D (May 1, 2020): 17–25. http://dx.doi.org/10.46717/igj.53.1d.2rw-2020-05-01.
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Chen, Lin Jie, and Bo Liang. "Analysis of Anti-Seismic Fortified Length of Tunnel Portal in High Seismic Intensity Area." Applied Mechanics and Materials 90-93 (September 2011): 2057–61. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2057.
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In high seismic intensity area, strong seismic motion may cause the ruin of highway tunnel, especially the tunnel portal which is the weak links for anti-seismic fortifying. Based on soil-structure interaction model, 3D seismic responses of tunnel portal, in combination with the Menglian tunnel engineering on the Bao-Teng Highway in Yunnan, were performed by using viscous-spring artificial boundary and time history analysis method. The anti-seismic fortified length of tunnel portal to the effects of dynamic and crack property was studied. The results show that the acceleration of lining gradually decreases with the lining extends to the tunnel body under the high-intensity seismic load. Along the axial direction of the tunnel, the crack from the portal 50m is not obvious. The results provide references for the tunnel anti-seismic design．
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Chen, Xiao-li, Xin-jian Shan, Ming-ming Wang, Chun-guo Liu, and Na-na Han. "Distribution Pattern of Coseismic Landslides Triggered by the 2017 Jiuzhaigou Ms 7.0 Earthquake of China: Control of Seismic Landslide Susceptibility." ISPRS International Journal of Geo-Information 9, no. 4 (March 27, 2020): 198. http://dx.doi.org/10.3390/ijgi9040198.
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On 8 August 2017 an earthquake (MS7.0) occurred within Jiuzhaigou County, Northern Aba Prefecture, Sichuan Province, China, triggering 4834 landslides with an individual area greater than 7.8 m2 over a more than 400 km2 region. Instead of correlating geological and topographic factors with the coseismic landslide distribution pattern, this study has attempted to reveal the control from seismic landslide susceptibility mapping, which relies on the calculation of critical acceleration values using a simplified Newmark block model. We calculated the average critical acceleration for each cell of the gridded study area (1 km×1 km), which represented the seismic landslide susceptibility of the cell. An index of the potential landslide area generation rate was defined, i.e., the possible landsliding area in each grid cell. In combination with PGA (peak ground acceleration) distribution, we calculated such indexes for each cell to predict the possible landslide hazard under seismic ground shaking. Results show that seismic landslide susceptibility plays an important role in determining the coseismic landslide pattern. The places with high seismic landslide susceptibility tends to host many landslides. Additionally, the areas with high potential landslide area generation rates have high real landslide occurrence rates, consistent with dominant small-medium scale landslides by this earthquake. This approach can aid assessment of seismic landslide hazards at a preliminary stage. Additionally, it forms a foundation for further research, such as the rapid evaluation of post-earthquake landslides and identifying highly impacted areas to help decision makers prioritize disaster relief efforts.
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Li, X., DY Li, LZ Jia, JP Song, and JS Yue. "Analysis and Research on Anti-seismic Scheme of Railway Simple Supported Beam Bridge." Journal of Physics: Conference Series 2158, no. 1 (January 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2158/1/012012.
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Abstract In order to improve the seismic performance of railway simply supported beam bridges, the seismic design schemes in different seismic intensity areas are compared and analyzed in this paper. The results show that the relative displacement of beam piers is too large when the simply supported beam bridge (≥ 0.3g) in high intensity earthquake area only adopts damping and isolation bearings. In order to reduce the displacement after earthquake, it is necessary to increase damping energy dissipation devices. Simply supported beam bridge in low intensity earthquake area (≤ 0.2g) adopt shock-absorbing isolation bearing. The cost of bearing will not increase, and the safety of bridge under earthquake will be greatly improved. It is recommended to adopt isolation design in low intensity seismic area.
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Stewart, Robert R. "Integrated seismic analysis: Kidney area, northern Alberta, Canada." GEOPHYSICS 54, no. 10 (October 1989): 1240–48. http://dx.doi.org/10.1190/1.1442583.
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Integrating various seismic data via simultaneous processing or correlation can increase the accuracy and confidence in subsurface images. To this end, a multioffset VSP survey with simultaneous surface recording was acquired in the fall of 1986 near Red Earth, northern Alberta, in the Kidney prospect area. P‐wave vibrators at three locations west of the survey well were recorded by a downhole three‐component geophone at 15 m increments between depths of 225 m and 1570 m and were recorded simultaneously on a 2900 m surface spread of vertical geophones spaced 25 m apart in line with the VSP sources and just west of the well. These data, along with existing seismic lines and well logs, correlated convincingly and were used to increase confidence in the interpretation of the potential reservoir of interest—a Keg River carbonate (KRC) unit. Tomographic procedures (constrained traveltime inversion) were developed to process simultaneously the well logs, VSP, and surface seismic data. These procedures provided a macroscopic seismic interval velocity in depth. This tomographic velocity structure (TVS) was used in poststack depth migration of an existing seismic line over the region of interest. The resulting depth‐migrated section near the well matched the synthetic seismogram (computed in depth from the sonic log) reasonably well in character and depth for most of the major reflectors. The TVS was also used in a fairly conventional processing flow which included poststack time migration, maximum‐likelihood deconvolution, seismic trace inversion, and time‐to‐depth stretching. The final processed pseudosonic section in depth bore considerable resemblance to the sonic log. About 30 m of KRC was measured from the pseudosonic section, while 35 m of KRC was interpreted from the well logs. The pseudosonic section also strongly suggested thinning or discontinuity in the KRC unit on the section around a previously proposed drilling location (1.7 km west of the well). This interpretation was confirmed by another operator’s subsequent drilling at this location, which encountered only 1 m of KRC. The predicted depth of the KRC top (about 1395 m), interpreted from the pseudosonic section at the second well location, was close to the depth (1400 m) on the well logs.
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S, Sulistiyani, Sorja Koesuma, and Nugroho Budi W. "Kajian Indeks Bahaya Seismik Regional Menggunakan Data Seismik Pulau Jawa Tahun 1900-2006." INDONESIAN JOURNAL OF APPLIED PHYSICS 3, no. 01 (May 21, 2016): 21. http://dx.doi.org/10.13057/ijap.v3i01.1210.
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<span>It has been conducted a research about Regional Seismic Disaster Index (RSDI) in Java Island <span>by using seismic data from 1900 – 2006. RSDI is a index showing vulnerability seismic <span>disaster in an area. The hight risk area is the highest risk, the low area is the lowest risk. The <span>highest RSDI areas were Banten, Jawa Barat, and D.I Yogyakarta Provinces. While the lowest <span>RSDI areas were DKI Jakarta and Jawa Tengah Province. Deviations standard value showed <span>the moving RSDI value each region. Region with big RSDI value had high Seismic level were <span>Banten , Jawa Barat, and D.I. Yogyakarta Province.</span></span></span></span></span></span><br /></span>
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Oh, HyunJu, JunSung Lee, and HyungChoon Park. "Microzonation of Sejong City Area Based on Site Amplification Generated by Pohang-Type Seismic Waves." Journal of the Korean Society of Hazard Mitigation 22, no. 6 (December 31, 2022): 263–71. http://dx.doi.org/10.9798/kosham.2022.22.6.263.
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When an earthquake occurs, the behavior of the ground is significantly influenced by the seismic wave characteristics (waveform) and soil layer conditions. In local and international seismic design standards, it is recommended that the input seismic wave should correspond to the design response spectrum and reflect the fault characteristics. In this study, ground response analysis was performed to satisfy the seismic design standards using modified design seismic waves generated by the Pohang seismic waves measured at the bedrock location. The peak ground acceleration, ground amplification ratio, and natural period of Sejong-si for Pohang-type seismic waves were determined using the Sejong-si 120 site exploration results. From a plotted risk map, a map of floors that could experience relatively large seismic loads during an earthquake was determined. Based on the risk map plotted in this study, it is possible to prepare for earthquake damage in advance by identifying the degree of seismic damage to a structure when an earthquake occurs and selecting the building inspection or seismic reinforcement priority.
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Kegyes-Brassai, O. K., and R. P. Ray. "Earthquake Risk Assessment – Effect of a Seismic Event in a Moderate Seismic Area." Acta Technica Jaurinensis 9, no. 1 (November 2, 2015): 1. http://dx.doi.org/10.14513/actatechjaur.v9.n1.383.
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Lacroix, Deborah L., Richard B. Lanctot, John A. Reed, and Trent L. McDonald. "Effect of underwater seismic surveys on molting male Long-tailed Ducks in the Beaufort Sea, Alaska." Canadian Journal of Zoology 81, no. 11 (November 1, 2003): 1862–75. http://dx.doi.org/10.1139/z03-185.
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Large numbers of Long-tailed Ducks (Clangula hyemalis) (10 000 – 30 000) undergo a postnuptial wing molt along barrier islands of the Beaufort Sea, Alaska. To investigate the potential effects of underwater seismic activities on this species, we monitored the number and diving behavior of molting Long-tailed Ducks before, during, and after seismic activities in a seismic area and two control areas nearby between July and September 2001. Aerial surveys documented a decline in duck numbers in both seismic and control areas during the period of seismic activity. We used automated data-collection computers to monitor the presence and diving behavior of radio-equipped Long-tailed Ducks residing within 2.5 km of a series of computer setups located along the barrier islands and on the mainland. A statistical analysis based on a modified before–after control–impact approach found no difference in indices of site fidelity or diving intensity between the seismic area and two control areas. Thus, we found no effect of seismic activity on movements and diving behavior of molting Long-tailed Ducks. These results should be evaluated carefully, however, as logistical and ecological factors limited our ability to detect more subtle disturbance effects. We recommend additional studies on other bird species to fully understand the effects of underwater seismic testing.
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Yao, Xin, and Lingjing Li. "Spatial-Temporal Assessment of Debris Flow Risk in the Ms8.0 Wenchuan Earthquake-Disturbed Area." Journal of Disaster Research 11, no. 4 (August 1, 2016): 720–31. http://dx.doi.org/10.20965/jdr.2016.p0720.
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For 5 years (2009–2013) after the 2008 Ms8.0 Wenchuan earthquake, rainfall led to the transformation of unconsolidated co-seismic deposits into extensive and severe debris flows, causing significant loss of life and property. For debris flows in the earthquake-disturbed area, a few common concerns exist. What is their spatial-temporal distribution? What are the controlling factors? How much is the rainfall threshold for debris flows? What areas are more susceptible? Where suffered the most severe losses of life and property? Using debris flow characteristics, this study analyzes the relationships between seismic geological factors, geomorphologic factors, extreme rainfall, and debris flows in the 5 years following the earthquake, and draws the following conclusions. (1) There are regional differences in the rainfall threshold for generation of debris flows, and the annual maximum 72-hour accumulated rainfall for triggering a debris flow decreases from pre-seismic periods (135–325 mm) to post-seismic periods (75–160 mm) by 44.4–50.8% in study area. (2) Areas with high debris flow susceptibility and hazard are primarily controlled by seismic geological conditions. (3) The long-term risk of debris flows will fall to moderate, and the affected area will shrink to that around the seismogenic fault. The results of this study will help with meteorological early warning systems, deployment of disaster prevention and control projects, and reconstruction site selection in the post-seismic Longmen Mountain area.
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Vamvakaris, D. A., C. B. Papazachos, Ch A. Papaioannou, E. M. Scordilis, and G. F. Karakaisis. "A detailed seismic zonation model for shallow earthquakes in the broader Aegean area." Natural Hazards and Earth System Sciences 16, no. 1 (January 18, 2016): 55–84. http://dx.doi.org/10.5194/nhess-16-55-2016.
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Abstract. In the present work we propose a new seismic zonation model of area type sources for the broader Aegean area, which can be readily used for seismic hazard assessment. The definition of this model is based not only on seismicity information but incorporates all available seismotectonic and neotectonic information for the study area, in an attempt to define zones which show not only a rather homogeneous seismicity release but also exhibit similar active faulting characteristics. For this reason, all available seismological information such as fault plane solutions and the corresponding kinematic axes have been incorporated in the analysis, as well as information about active tectonics, such as seismic and active faults. Moreover, various morphotectonic features (e.g. relief, coastline) were also considered. Finally, a revised seismic catalogue is employed and earthquake epicentres since historical times (550 BC–2008) are employed, in order to define areas of common seismotectonic characteristics, that could constitute a discrete seismic zone. A new revised model of 113 earthquake seismic zones of shallow earthquakes for the broader Aegean area is finally proposed. Using the proposed zonation model, a detailed study is performed for the catalogue completeness for the recent instrumental period.Using the defined completeness information, seismicity parameters (such as G–R values) for the 113 new seismic zones have been calculated, and their spatial distribution was also examined. The spatial variation of the obtained b values shows an excellent correlation with the geotectonic setting in the area, in good agreement with previous studies. Moreover, a quantitative estimation of seismicity is performed in terms of the mean return period, Tm, of large (M ≥ 6.0) earthquakes, as well as the most frequent maximum magnitude, Mt, for a typical time period (T = 50 yr), revealing significant spatial variations of seismicity levels within the study area. The new proposed seismic zonation model and its parameters can be readily employed for seismic hazard assessment for the broader Aegean area.
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Vamvakaris, D. A., C. B. Papazachos, C. Papaioannou, E. M. Scordilis, and G. F. Karakaisis. "A detailed seismic zonation model for shallow earthquakes in the broader Aegean area." Natural Hazards and Earth System Sciences Discussions 1, no. 6 (November 25, 2013): 6719–84. http://dx.doi.org/10.5194/nhessd-1-6719-2013.
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Abstract. In the present work we present an effort to define a new seismic zonation model of area type sources for the broader Aegean area, which can be readily used for seismic hazard assessment. The definition of this model is based not only on seismicity information but incorporates all available seismotectonic and neotectonic information available for the study area, in an attempt to define zones which show not only a rather homogeneous seismicity release but also exhibit similar active faulting characteristics. For this reason, all available seismological information such as fault plane solutions and the corresponding kinematic axes have been incorporated in the analysis, as well as information about active tectonics, such as seismic and active faults. Moreover, various morphotectonic features (e.g. relief, coastline) were also considered. Finally, a revised seismic catalogue is employed and earthquake epicentres since historical times (550 BC–2008) are considered, in order to define areas of common seismotectonic characteristics, that could constitute a discrete seismic zone. A new revised model of 113 earthquake seismic zones of shallow earthquakes for the broader Aegean area is finally proposed. Using the proposed zonation model, a detailed study is performed for the catalogue completeness for the recent instrumental period. Using the defined completeness information, seismicity parameters (such as G–R values) for the 113 new seismic zones have been calculated, and their spatial distribution was also examined. The spatial variation of the obtained b values shows an excellent correlation with the geotectonic setting in the area, in good agreement with previous studies. Moreover, a quantitative estimation of seismicity is performed in terms of the mean return period, Tm, of large (M ≥ 6.0) earthquakes, as well as the most frequent maximum magnitude, Mt, for a typical time period (T = 50 yr), revealing significant spatial variations of seismicity levels within the study area. The new proposed seismic zonation model and its parameters can be readily employed for seismic hazard assessment for the broader Aegean area.
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D'Alessandro, A., A. Gervasi, and I. Guerra. "Evolution and strengthening of the Calabrian Regional Seismic Network." Advances in Geosciences 36 (August 30, 2013): 11–16. http://dx.doi.org/10.5194/adgeo-36-11-2013.
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Abstract. The Calabrian Arc is an area of high seismic hazard, in the past often affected by destructive earthquakes. The seismicity of the Calabrian region is monitored by the Italian National Seismic Network integrated by the Calabrian Regional one and, in the last three years, by the Pollino temporary array. We have applied the Seismic Network Evaluation through Simulation to assess the individual contribution of each network in locating earthquakes with epicentres in the Calabrian region and surrounding. We shows that the Calabrian Regional Seismic Network greatly improves the quality of the coverage in almost the Calabria territory except in the Crotone Basin, in the Serre and in the offshore areas. We show that the contribution of the Pollino temporary array is instead restricted to a very small area centred on the Pollino Chain. Due to the presence in the Serre of important seismogenic volumes, which in the past have generated destructive earthquakes, it would be opportune to add at least several seismic stations in this area and surrounding to improve the seismic monitoring.
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Chauhan, Anjeet Singh, and Rajiv Banerjee. "Seismic Analysis of Irregular Building on Hilly Area." Journal of Mechanical and Construction Engineering (JMCE) 1, no. 1 (April 3, 2021): 1–7. http://dx.doi.org/10.54060/jmce/001.01.003.
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The RC buildings' construction has increased in the preferred location of north & eastern hilly areas during the last few decades due to population increase, urbanization, and tourists. The buildings located in the hilly areas are more susceptible to seismic loading as compared to the location of the flat surface building. The shape of the building on the sloping ground differs from the flat surface situated buildings. So, the construction of the building on hilly areas are irregular both vertically & horizontally, thus this type of building is susceptible to severe damage when applied to the seismic condition. The column of the base storey having unequal height due to sloping ground. In this study, the behaviour of a 10 storey stepback building with mass and diaphragm irregularity on the sloping ground is analysed in seismic zone V by Response Spectrum. The analysis of the building is carried out by Etabs software as per IS 1893:2016 to compare the building based on their dynamic response and also identify the vulnerability frame in the sloping ground.