Готові списки джерел за темами / Surface anomaly

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Добірка наукової літератури з теми "Surface anomaly"

Автор: Grafiati
Опубліковано: 6 липня 2022

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Статті в журналах з теми "Surface anomaly"

1

Ilahude, Delyuzar. "MAGNETIC ANOMALY PATTERNS USING TREND SURFACE ANALYSIS APPLICATION (TSA) ON MARINE GEOLOGY MAPPING IN THE BALIKPAPAN WATERS." BULLETIN OF THE MARINE GEOLOGY 27, no. 1 (February 15, 2016): 19. http://dx.doi.org/10.32693/bomg.27.1.2012.42.

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Анотація:
The application of Trend Surface Analysis (TSA) method an geological and geophysical research in map sheets 1813-1814, Balikpapan Waters and its surrounding, shows the significant value of residual anomaly. The magnetic disseverance of regional and total anomaly value obtained the negative anomaly between -50 nT and -350 nT and positive anomaly between +50 nT and +400 nT. The contour of total and regional anomaly shows the magnetic properties of rocks which characterizes the geological arrangements of the research areas. Residual anomaly yielded from the 2nd order value of regional anomaly might be correlated with the formation of basin structures in the central and northern parts of research area, which is interpreted as a part of Kutai Basin. Keywords : TSA method, magnetic anomaly, geology and geophisics, Balikpapan Waters. Penerapan metode TSA dalam penelitian geologi dan geofisika di Lembar Peta 1813-1814, Perairan Balikpapan dan sekitarnya menunjukkan nilai anomali sisa yang cukup signifikan. Hasil pemisahan nilai anomali magnet regional dan anomaly total diperoleh nilai anomali yaitu antara -50 nT dan –350 nT dan anomali positif antara +50 nT dan +400 nT. Kontur anomali total dan anomali regional memperlihatkan sifat kemagnitan batuan yang mencirikan tatanan geologi daerah penelitian. Anomali sisa dihasilkan dari nilai anomali regional orde ke 2, kemungkinan berkaitan dengan pembentukan struktur cekungan di bagian tengah dan utara daerah penelitian yang ditafsirkan sebagai bagian dari Cekungan Kutai. Kata kunci : metode TSA, anomali magnet, geologi dan geofisika, Perairan Balikpapan.
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2

Ilahude, Delyuzar, and Beben Rachmat. "POLA ANOMALI MAGNET LOKAL DARI APLIKASI TREND SURFACE ANALYSIS (TSA) PADA PEMETAAN GEOLOGI KELAUTAN BERSISTEM DI PERAIRAN SELAT MALAKA SUMATERA UTARA." JURNAL GEOLOGI KELAUTAN 9, no. 2 (February 16, 2016): 109. http://dx.doi.org/10.32693/jgk.9.2.2011.204.

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Анотація:
Analisis intensitas magnet dari penerapan metode TSA orde ke 2 menunjukkan nilai anomali lokal yang cukup signifikan dari pemisahan nilai anomali magnet total di perairan Selat Malaka. Kontur anomali lokal yang dihasilkan diduga berkaitan dengan pola struktur geologi busur belakang Sumatera Utara. Kata kunci : anomali lokal, metode TSA Analysis of magnetic intensity using 2nd orde of the TSA method shows a significant value of local anomaly from the separation of total magnetic anomaly value in the Malaka Strait waters. Contour of the local anomaly resulted is assumed to be correlated with the geological structure pattern of back arc of North Sumatera. Keyword : local anomaly, TSA method
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3

Cai, Jiaxiong. "Surface Magnetic Anomaly Triangulation Inversion." International Journal of Geosciences 10, no. 02 (2019): 160–72. http://dx.doi.org/10.4236/ijg.2019.102010.

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4

Subagio, Subagio, and Tatang Patmawidjaya. "POLA ANOMALI BOUGUER DAN ANOMALI MAGNET DAN KAITANNYA DENGAN PROSPEK SUMBER DAYA MINERAL DAN ENERGI DI PULAU LAUT, PULAU SEBUKU DAN SELAT SEBUKU, KALIMANTAN SELATAN." JURNAL GEOLOGI KELAUTAN 11, no. 3 (February 16, 2016): 115. http://dx.doi.org/10.32693/jgk.11.3.2013.236.

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Анотація:
Anomali Bouguer Pulau Laut, Pulau Sebuku, dan Selat Sebuku dapat dikelompokkan menjadi dua wilayah anomali meliputi anomali berpola melingkar dengan kisaran nilai dari 40 hingga 64 mGal, dan anomali berpola lurus dengan kisaran nilai 40 hingga 50 mGal. Anomali magnet di daerah ini bervariasi dari -700 hingga 1600 nT, membentuk pola tinggian dan rendahan. Anomali Bouguer berpola melingkar dengan kisaran nilai 45-64 mGal mencerminkan batuan ultrabasa yang relatif mendekati permukaan. Batuan ultrabasa yang tersingkap di permukaan dicirikan oleh anomali magnet tinggi. Anomali Bouguer berpola kontur lurus sejajar menunjukkan sesar naik maupun sesar turun yang terdapat di daerah tersebut. Sesar naik yang berkembang di daerah penelitian umumnya terdapat di Pegunungan Meratus yang mempunyai mendala geologi sama. Anomali Bouguer dan anomali magnet rendah mencerminkan cekungan sedimen. yang diakibatkan oleh adanya gaya tarikan yang pernah ada. Batuan terobosan yang dijumpai, diduga terbentuk bersamaan dengan periode gaya tarikan ini. Serangkaian proses tektonik yang hasilnya terekam pada anomali Bouguer, anomali magnet, dan singkapan batuan memberi implikasi kemungkinan terdapatnya sumber daya energi dan mineral di daerah penelitian. Mineralisasi logam diperkirakan dapat dijumpai di sekitar daerah terobosan. Bijih besi, nikel, dan kromit kemungkinan terdapat di daerah ultra-mafik, sedangkan batubara di daerah cekungan sedimen. Kata kunci : Anomali Bouguer, anomali magnet, sumber daya energi dan mineral, sesar naik dan sesar turun. Bouguer anomaly of the Laut Island, Sebuku Island, and The Sebuku Strait can be grouped into two anomaly groups covering the circular pattern anomaly with range from 40 to 64 mGals, and the straight pattern with range of values from 40 to 50 mGals. The range of magnetic anomalies in the study area area from -700 to 1600 nT, forming high and low anomay patterns. The circular pattern of the Bouguer anomalies with range from 45 to 64 mGals reflects that the ultramafic rocks relatively close to the surface, while exposed ultrabasic rocks are indicated by high magnetic anomalies. Paralled pattern contour of Bouguer anomaly show a thrust faults and normal faults in this area. Thrust faults of commonly develop in Meratus Mountaint that has the same geological setting. The low Bouguer and magnetic anomalies reflect a sedimentary basin caused by previous tensional force. The intrusion rocks found in the study area suggest to be formed together with this tensional force period. A series of tectonic events recorded in Bougue anomaly, magnetic anomaly, and out crops gave the implication the possibility the present of energy and mineral resources in the study area. Metal mineralization suggests to be found in the intrusion area. Irons, nickels and chromites supposed can be found in the ulta-mafic area, while coal can be found in the sedimentary basin. Keywords : Bouguer anomalies, magnetic anomalies, energy and mineral resources, thrust and normal faults.
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5

Kim, Yong W. "Development of Near-Surface Composition Anomaly." International Journal of Thermophysics 25, no. 2 (March 2004): 575–86. http://dx.doi.org/10.1023/b:ijot.0000028491.49665.c4.

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6

Schwenk, J. Tyler, Steven D. Sloan, Julian Ivanov, and Richard D. Miller. "Surface-wave methods for anomaly detection." GEOPHYSICS 81, no. 4 (July 2016): EN29—EN42. http://dx.doi.org/10.1190/geo2015-0356.1.

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Анотація:
Perimeter-defense operations, geohazard assessment, and engineering characterization require the detection and localization of subsurface anomalies. Seismic waves incident upon these discontinuities generate a scattered wavefield. We have developed various surface-wave techniques, currently being fielded, that have consistently delivered accurate and precise results across a wide range of survey parameters and geographical locations. We use the multichannel analysis of surface waves approach to study the multimode Rayleigh wave, the backscatter analysis of surface waves (BASW) method to detect anomalies, 3D visualization for efficient seismic interpretation, BASW correlation for attribute analysis, and instantaneous-amplitude integration in the complex BASW method. Discrete linear moveout functions and [Formula: see text]-[Formula: see text] filter designs are optimized for BASW considering the fundamental and higher mode dispersion trends of the Rayleigh wave. Synthetic and field data were used to demonstrate multimode BASW and mode separation, which accentuated individual scatter events, and ultimately increased confidence in points of interest. Simple correlation algorithms between fundamental and higher-mode BASW data offer attribute analysis that limits the subjective interpretation of BASW images. Domain sorting and Hilbert transforms allow for 3D visualization and rapid interpretation of an anomaly’s wavefield phenomena within an amplitude cube. Furthermore, instantaneous-amplitude analysis can be incorporated into a more robust complex BASW method that forgives velocity-estimation inaccuracies, while requiring less rigorous preprocessing. Our investigations have suggested that a multifaceted surface-wave analysis provides a valuable tool for today’s geophysicists to fulfill anomaly-detection survey requirements.
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7

Hulpke, E., and J. Lüdecke. "Surface phonon anomaly induced by adsorption." Journal of Electron Spectroscopy and Related Phenomena 64-65 (December 1993): 641–49. http://dx.doi.org/10.1016/0368-2048(93)80132-6.

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8

Ravat, D., K. A. Whaler, M. Pilkington, T. Sabaka, and M. Purucker. "Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada." GEOPHYSICS 67, no. 2 (March 2002): 546–54. http://dx.doi.org/10.1190/1.1468615.

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Анотація:
Results from equivalent-source distributions derived jointly from high-altitude (average 4 km) aeromagnetic and Magsat-derived (average 400 km) magnetic anomalies over Canada indicate that long-wavelength components (500–2500 km) in these fields are extremely compatible with one another (with a correlation coefficient of 0.95). The jointly estimated anomaly field at the earth's surface can be used as a long-wavelength adjustment surface for regional near-surface magnetic anomaly compilations and in assessing the performance of other downward-continuation techniques. Because near-surface anomalies are not available over all regions of the world, we compare the jointly estimated anomaly field to the results of two different downward-continuation techniques: the evaluation of anomalies at the earth's surface from spherical harmonic coefficients derived from satellite-altitude data and the use of downward-continuation methods based on harmonic splines. Numerical and visual comparisons of these downward- continued fields with the jointly estimated anomaly field from the equivalent-source method indicate they are well correlated and could provide a useful method of deriving long-wavelength leveling surfaces for regional and worldwide magnetic anomaly maps.
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9

Wahyuni, Silvia, and Marzuki Marzuki. "Analisis Anomali Temperatur Permukaan Tanah dan Awan Gempa Berkaitan dengan Gempa Palu 2018." Jurnal Fisika Unand 9, no. 3 (August 14, 2020): 352–59. http://dx.doi.org/10.25077/jfu.9.3.352-359.2020.

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Анотація:
Anomali temperatur permukaan tanah dan awan gempa yang berkaitan gempa bumi yang terjadi di Palu 28 September 2018 telah diteliti menggunakan data temperatur permukaan tanah dan permukaan air laut dari Moderate Resolution Imaging Spectroradiometer (MODIS) dan data awan dari satelit Multifunction Transport Satellite (MTSAT). Data temperatur udara dari European Centre for Medium Range Weather Forecasts (EMCWF) juga digunakan untuk memastikan bahwa anomali temperatur bukan disebabkan oleh aktivitas cuaca. Anomali temperature permukaan tanah diamati selama 5 tahun dari 2014-2018 dan awan gempa diamati 3 bulan sebelum terjadi gempa bumi. Penelitian ini menemukan adanya kenaikan temperatur permukaan tanah dan air laut sebagai prekursor gempa Palu 2018. Pada saat terjadi gempa kenaikan temperatur permukaan tanah pada siang hari sebesar 2,2 K melebihi batas nilai sebagai prekursor gempa bumi (2 K) tetapi kenaikan temperatur teramati setiap tahun. Selain itu, anomali temperatur permukaan laut hanya 0,25 K masih lebih kecil dari anomali sebagai prekursor gempa bumi (2 K). Selama itu tidak ditemukan juga adanya kemunculan awan gempa sebelum gempa terjadi. Dengan demikian gempa Palu 2018 tidak diiringi oleh kenaikan temperatur permukaan tanah dan air laut serta kemunculan awan gempa. Anomaly land surface temperature and earthquake cloud that related the 2018 Palu earthquake were examined using land and sea surface temperatures from Moderate Resolution Imaging Spectroradiometer (MODIS) and cloud from the Multifunction Transport Satellite (MTSAT) satellite data. Air temperature data from the European Center for Medium-Range Weather Forecasts (EMCWF) were also used to ensure that temperature anomalies are not caused by weather activity. Land surface temperature anomalies were observed for five years from 2014-2018, and earthquake clouds were observed for three months before the earthquake. This study find an increase in the surface temperature of land and seawater as a precursor to the 2018 Palu earthquake. During the earthquake, there was an increase in land surface temperature by 2,2 K, which exceeds the limit value of anomaly land surface temperature as an earthquake precursor ( 2 K), but such an increase is observed every year. In addition, sea surface temperature anomaly is only 0,25 K, which is much smaller than the value as an earthquake precursor ( 2 K). It was also found that there is no earthquake cloud before the Palu earthquake. Thus, the 2018 Palu earthquake was not accompanied by an increase in land and sea surface temperatures and the appearance of earthquake clouds.
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10

Marpaung, Sartono, and Wawan K. Harsanugraha. "ANALYSIS OF SEA SURFACE HEIGHT ANOMALY CHARACTERISTICS BASED ON SATELLITE ALTIMETRY DATA (CASE STUDY: SEAS SURROUNDING JAVA ISLAND)." International Journal of Remote Sensing and Earth Sciences (IJReSES) 11, no. 2 (April 12, 2017): 137. http://dx.doi.org/10.30536/j.ijreses.2014.v11.a2611.

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Анотація:
Sea surface height anomaly is a oceanographic parameter that has spatial and temporal variability. This paper aims to determine the characters of sea surface height anomaly in the south and north seas of Java Island. To find these characters, a descriptive analysis of monthly anomaly data is performed spatially, zonally and temporally. Based on satellite altimetry data from 1993 to 2010, the analysis shows that the average of sea surface height anomaly varies, ranging from -15 cm to 15 cm. Spatially and zonally, there are three patterns that can be concidered as sea surface height anomaly characteristics: anomaly is higher in coastal areas than in open seas, anomaly is lower in coastal areas than in open seas and anomaly in coastal area is almost the same as in open seas. The first and second patterns occur in the south and north seas of Java Island. The third pattern occurs simultaneously in south and north seas of Java Island. Characteristics of temporal anomaly have a sinusoidal pattern in south and north seas of Java Island.
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Більше джерел

Дисертації з теми "Surface anomaly"

1

Le, Jiahui. "Application of Deep-learning Method to Surface Anomaly Detection." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105240.

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Анотація:
In traditional industrial manufacturing, due to the limitations of science and technology, manual inspection methods are still used to detect product surface defects. This method is slow and inefficient due to manual limitations and backward technology. The aim of this thesis is to research whether it is possible to automate this using modern computer hardware and image classification of defects using different deep learning methods. The report concludes, based on results from controlled experiments, that it is possible to achieve a dice coefficient of more than 81%.
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2

Richmond, N. C., L. L. Hood, and A. B. Binder. "Correlations between magnetic anomalies and surface geology antipodal to lunar impact basins." AMER GEOPHYSICAL UNION, 2005. http://hdl.handle.net/10150/623350.

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Анотація:
Previous work has shown that the strongest concentrations of lunar crustal magnetic anomalies are located antipodal to four large, similarly aged impact basins (Orientale, Serenitatis, Imbrium, and Crisium). Here, we report results of a correlation study between magnetic anomaly clusters and geology in areas antipodal to Imbrium, Orientale, and Crisium. Unusual geologic terranes, interpreted to be of seismic or ejecta origin associated with the antipodal basins, have been mapped antipodal to both Orientale and Imbrium. All three antipode regions have many high-albedo swirl markings. Results indicate that both of the unusual antipode terranes and Mare Ingenii (antipodal to Imbrium) show a correlation with high-magnitude crustal magnetic anomalies. A statistical correlation between all geologic units and regions of medium to high magnetization when high-albedo features are present (antipodal to Orientale) may suggest a deep, possibly seismic origin to the anomalies. However, previous studies have provided strong evidence that basin ejecta units are the most likely sources of lunar crustal anomalies, and there is currently insufficient evidence to differentiate between an ejecta or seismic origin for the antipodal anomalies. Results indicate a strong correlation between the high-albedo markings and regions of high magnetization for the Imbrium, Orientale, and Crisium antipodes. Combined with growing evidence for an Imbrian age to the magnetic anomalies, this supports a solar wind deflection origin for the lunar swirls.
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3

Wei, Li. "Processing and Interpretation of Three-Component Borehole/Surface Seismic Data over Gabor Gas Storage Field." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1441043179.

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4

Harada, Yuki. "Interactions of Earth's Magnetotail Plasma with the Surface, Plasma, and Magnetic Anomalies of the Moon." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188495.

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5

Terra, Nova Filipe. "The time-dependence of reversed flux patches in archeomagnetic field models and numerical dynamo simulations : implication for the South Atlantic Anomaly evolution." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4023/document.

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Анотація:
Les modèles de champ archéomagnétique et les simulations numériques de dynamos fournissent des informations importantes sur la géodynamique. J'ai étudié l’existence et la mobilité des patches de flux inverse (PFI) dans les modèles de champ archéomagnétique. J'ai comparé le suivi des PFIs avec les anomalies sismologiques à la base du manteau pour explorer si les PFIs ont des emplacements privilégiés prescrits par l'hétérogénéité latérale à la base du manteau. Les PFI sont ainsi interprétés en termes de dynamique de noyau et d'interactions thermiques noyau-manteau. La corrélation en co-latitude et le décalage en longitude permettent d'inférer l'orientation azimutale du champ toroidal et la présence d'un large upwelling au sommet du noyau. L'Anomalie de l'Atlantique Sud (AAS) est une région de faible intensité géomagnétique à la surface de la Terre, qui est communément attribuée aux PFIs sur la frontière noyau manteau (FNM). Alors que l’AAS est clairement affecté par la région de flux inverse sous l'Atlantique Sud, je montre que la relation entre l’AAS et les PFIs n'est pas simple. L'anomalie est déterminée par l'interaction de plusieurs patches de flux (normal et inverse) à la FNM. Des scenarios simples de variation séculaire (VS) suggèrent que si le déplacement de l’AAS peut être expliqué par l'advection, sa chute d'intensité nécessite la diffusion magnétique. J'ai déterminé si l'hétérogénéité thermique du manteau inférieur pouvait expliquer l'emplacement de l’AAS avec des dynamos numériques dont le flux de chaleur à la FMN est hétérogène. Les histogrammes des coordonnées des minima d'intensité de surface montrent deux pics de position longitudinale préférée dont un est proche de la longitude actuelle de l’AAS. Les ingrédients pour reproduire les coordonnées de l'AAS sont liés à l'asymétrie nord-sud du flux normal et inverse
Archeomagnetic field models and numerical dynamo simulations provide important insights to the geodynamo. I investigated the existence and mobility of reversed flux patches (RFPs) in archeomagnetic field models. I compared the tracking of RFPs with seismic anomalies of the lowermost mantle to explore if RFPs have preferred locations prescribed by lower mantle lateral heterogeneity and interpreted in terms of core dynamics and core-mantle thermal interactions. Correlation in co-latitude and a shift in longitude allowed inferring azimuthal orientation of toroidal field below the core-mantle boundary (CMB) and the presence of large fluid upwelling structures at the top of the core. The South Atlantic Anomaly (SAA) is a region of weak geomagnetic field intensity at the Earth's surface, which is commonly attributed to RFPs on the CMB. While the SAA is clearly affected by the reversed flux region below the South Atlantic, I showed that the relation between the SAA and RFPs is not straightforward. The SAA minimum is determined by the interplay among several robust flux patches at the CMB. Simple secular variation (SV) scenarios suggest that while the SAA path can be explained by advection, its intensity decrease requires magnetic diffusion. Investigating whether lower mantle thermal heterogeneity may explain the location of the SAA was tested with run numerical dynamos with heterogeneous CMB heat flux. Histograms of the coordinates of surface intensity minima show two peaks of preferred longitudinal position of weakest surface field intensity, one close to the present SAA minimum longitude. The ingredients to reproduce the SAA coordinates are related to north-south asymmetry of normal and reversed flux
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6

Michaud, Réjean. "Sensibilite de previsions meteorologiques a longue echeance aux anomalies de temperature superficielle des oceans." Paris 6, 1987. http://www.theses.fr/1987PA066528.

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Анотація:
Nous observons une grande variabilite interannuelle des moyennes mensuelles et saisonnieres de la circulation atmospherique. Cette variabilite ne peut s'expliquer uniquement par les mecanismes internes de l'atmosphere, specialement dans le cas des regions intertropicales, la variabilite interannuelle des conditions a sa frontiere inferieure, en particulier les temperatures superficielles des oceans, en est donc l'origine, comme le demontre l'observation de circulations atmospheriques tres voisines lors du retour des memes temperatures oceaniques exceptionnelles. Ainsi, une certaine predicibilite des moyennes temporelles de la circulation atmospherique peut-elle etre fondee sur la prevision des anomalies de temperature oceanique. Cependant, en raison de l'existence d'un delai dans le developpement de l'impact de ces anomalies sur l'atmosphere, le probleme de la prevision meteorologique a longue echeance nous amene a poser la question suivante: a partir de quelle echeance la prise en compte des anomalies de temperature oceanique (nous supposons celles-ci parfaitement predites) a-t-elle une influence significative sur la prevision. Les previsions numeriques realisees a l'aide du modele de circulation generale de l'atmosphere du lmd montrent que les anomalies de temperature oceanique proche-equatoriales influencent tres rapidement, en quelques jours, la circulation atmospherique predite. De meme, cette influence se poursuit sur periode relativement longue, superieure au mois. Ainsi, ces deux resultats indiquent que la pleine influence des anomalies de temperature oceanique sur la circulation atmospherique simulee par le modele ne peut etre obtenue que par la prise en compte de ces anomalies sur une periode superieure au mois
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7

Xie, Yong. "Transmission Properties of Sub-Wavelength Metallic Slits and Their Applications." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195217.

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Анотація:
With the manufacture of nano-scale features in the last ten years, it is possible to do optical experiments on features as small as a tenth/hundredth wavelength. It turns out that the experimental data cannot be explained by classical diffraction theories. Thus, it is necessary to develop new methods or use existing approaches which are effective in other fields, to solve problems in photonics. We use finite difference time domain (FDTD), to study transmission properties of sub-wavelength slits in a metallic film. By doing simulations on periodic and single slits, we confirm that the TE mode has a cutoff while a TM mode always has a propagating mode in the small apertures. Then we find that the transmittance is minimum when the array period is equal to the wavelength of surface plasmon polariton (SPP) at normal incidence. In fact, the SPP-like waves exist in both periodic and isolated slits, and they help the transmittance of small apertures. In order to establish the role of SPP in the transmission mechanism, it is necessary to single out each mode from the total fields. We developed Bloch mode method (BMM) to calculate the amplitudes of the lowest N orders, and the amplitudes tell us which one is dominant (not including the guided mode) at high and low transmission. BMM converges very fast and it is more accurate than FDTD since it does not suffer from numerical dispersion. Both methods can resolve the Wood anomaly and SPP anomaly; however, FDTD converges very slowly at the SPP resonance and oscillates around the value obtained through BMM at the Wood anomaly. BMM is not sensitive to material types, incident angles, and anomalies; it will be a useful tool to investigate similar problems.
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8

Tufekci, Sinan. "Combined Surface-Wave and Resistivity Imaging for Shallow Subsurface Characterization." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1250891786.

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9

Saballos, Jose Armando. "Short and Long Term Volcano Instability Studies at Concepción Volcano, Nicaragua." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4757.

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Concepción is the most active composite volcano in Nicaragua, and is located on Ometepe Island, within Lake Nicaragua. Moderate to small volcanic explosions with a volcanic explosivity index (VEI) of 1-2 have been characteristic of this volcano during the last four decades. Although its current activity is not violent, its volcanic deposits reveal stages of violent activity involving Plinian and sub-Plinian eruptions that deposited vast amounts of volcanic tephra in the Atlantic Ocean. These observations, together with the 31,000 people living on the island, make Concepción volcano an important target for volcanological research. My research focuses on the investigation of the stability of the volcano edifice of Concepción, using geophysical data such as gravity, geodetic global positioning system (GPS), sulphur dioxide (SO2) flux, real-time seismic amplitude (RSAM), and satellite remotely-sensed data. The integration of these data sets provides information about the short-term behavior of Concepción, and some insights into the volcano's long-term behavior. This study has provided, for the first time, information about the shallow dynamics of Concepción on time scales of days to weeks. I furnish evidence that this volcano is not gravitationally spreading in a continuous fashion as previously thought, that its bulk average density is comparable to that of a pile of gravel, that the volcano edifice is composed of two major distinctive lithologies, that the deformation field around the volcano is recoverable in a matter of days, and that the deformation source is located in the shallow crust. This source is also degassing through the relatively open magmatic conduit. There are, however, several remaining questions. Although the volcano is not spreading continuously there is the possibility that gravitational spreading may be taking place in a stick-slip fashion. This has important implications for slope stability of the volcano, and the associated hazards. The factors influencing the long term slope stability of the volcano are still not fully resolved, but internal volcanic processes and anthropogenic disturbances appear to be the major factors.
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Berthiere, Clément. "Entanglement, boundaries and holography." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4017.

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La notion d’entropie d’intrication a eu un profond impact sur la physique théorique, particulièrement depuis ces dix dernières années. D’abord introduite afin expliquer l’entropie des trous noirs, son champ d’application s’est par la suite ouvert à une grande variété de domaines de recherche, de la matière condensée à la gravitation quantique, de l’information quantique à la théorie quantique des champs. Dans ce contexte scientifique effervescent, l’entropie d’intrication apparait comme un outil central et doit donc intensivement être étudiée. A l’origine de cette thèse se trouve le désir de mieux comprendre cette entropie. D’intéressants développements concernant les effets de bord sur l’entropie d’intrication ont vu le jour récemment. Nous proposons donc d’explorer comment le bord d’un espace affecte l’entropie, en particulier dans la situation où la surface d’intrication intersecte ce bord. Nous présentons des calculs explicites de l’entropie d’intrication en espace plat avec bords. Nous montrons que des termes induits par ces bords apparaissent dans l’entropie et nous soulignons le rôle prépondérant que jouent les conditions aux bords. Nous étudions ensuite la contribution de bord dans le terme logarithmique de l’entropie d’intrication en dimensions trois et quatre. Nous calculons en premier lieu ce terme en théorie des champs pour la théorie N = 4 de Yang-Mills, puis nous répétons ce calcul de manière holographique. Nous montrons que ces deux méthodes de calcul donnent le même résultat, si du côté théorie des champs les conditions aux bords préservent la moitié de la supersymétrie et que du côté gravité l’extension du bord dans le bulk est une surface minimale
The entanglement entropy has had a tremendous and profound impact on theoretical physics, particularly since the last decade. First introduced in an attempt to explain black holes entropy, it has then found applications in a wide range of research areas, from condensed matter physics to quantum gravity, from quantum information to quantum field theory. In this exciting scientific context, the entanglement entropy has thus emerged as a useful and pivotal tool, and as such justifies the need to be intensively studied. At the heart of this thesis therefore lies the desire to better understand the entanglement entropy. Interesting developments during the recent years concern the boundary effects on the entanglement entropy. This dissertation proposes to explore the question of how the presence of spacetime boundaries affects the entropy, specifically in situations where the entangling surface intersects these boundaries. We present explicit calculations of entanglement entropy in flat spacetime with plane boundaries. We show that boundary induced terms appear in the entropy and we emphasize the prominent role of the boundary conditions. We then study the boundary contribution to the logarithmic term in the entanglement entropy in three and four dimensions. We perform the field theoretic computation of this boundary term for the free N = 4 super-gauge multiplet and then repeat the same calculation holographically. We show that these two calculations are in agreement provided that on the field theory side one chooses the boundary conditions which preserve half of the full supersymmetry and that on the gravity side the extension of the boundary in the bulk is minimal
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Книги з теми "Surface anomaly"

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Behera, Swadhin, and Toshio Yamagata. Climate Dynamics of ENSO Modoki Phenomena. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.612.

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The El Niño Modoki/La Niña Modoki (ENSO Modoki) is a newly acknowledged face of ocean-atmosphere coupled variability in the tropical Pacific Ocean. The oceanic and atmospheric conditions associated with the El Niño Modoki are different from that of canonical El Niño, which is extensively studied for its dynamics and worldwide impacts. A typical El Niño event is marked by a warm anomaly of sea surface temperature (SST) in the equatorial eastern Pacific. Because of the associated changes in the surface winds and the weakening of coastal upwelling, the coasts of South America suffer from widespread fish mortality during the event. Quite opposite of this characteristic change in the ocean condition, cold SST anomalies prevail in the eastern equatorial Pacific during the El Niño Modoki events, but with the warm anomalies intensified in the central Pacific. The boreal winter condition of 2004 is a typical example of such an event, when a tripole pattern is noticed in the SST anomalies; warm central Pacific flanked by cold eastern and western regions. The SST anomalies are coupled to a double cell in anomalous Walker circulation with rising motion in the central parts and sinking motion on both sides of the basin. This is again a different feature compared to the well-known single-cell anomalous Walker circulation during El Niños. La Niña Modoki is the opposite phase of the El Niño Modoki, when a cold central Pacific is flanked by warm anomalies on both sides.The Modoki events are seen to peak in both boreal summer and winter and hence are not seasonally phase-locked to a single seasonal cycle like El Niño/La Niña events. Because of this distinction in the seasonality, the teleconnection arising from these events will vary between the seasons as teleconnection path will vary depending on the prevailing seasonal mean conditions in the atmosphere. Moreover, the Modoki El Niño/La Niña impacts over regions such as the western coast of the United States, the Far East including Japan, Australia, and southern Africa, etc., are opposite to those of the canonical El Niño/La Niña. For example, the western coasts of the United States suffer from severe droughts during El Niño Modoki, whereas those regions are quite wet during El Niño. The influences of Modoki events are also seen in tropical cyclogenesis, stratosphere warming of the Southern Hemisphere, ocean primary productivity, river discharges, sea level variations, etc. A remarkable feature associated with Modoki events is the decadal flattening of the equatorial thermocline and weakening of zonal thermal gradient. The associated ocean-atmosphere conditions have caused frequent and persistent developments of Modoki events in recent decades.
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Частини книг з теми "Surface anomaly"

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Gallavotti, G. "One Dimensional Anomaly of the Fermi Surface." In On Three Levels, 165–73. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2460-1_17.

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Pitard, Gilles, Gaëtan Le Goïc, Alamin Mansouri, Hugues Favrelière, Maurice Pillet, Sony George, and Jon Yngve Hardeberg. "Robust Anomaly Detection Using Reflectance Transformation Imaging for Surface Quality Inspection." In Image Analysis, 550–61. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59126-1_46.

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Hung, Tzu-Yi, Sriram Vaikundam, Vidhya Natarajan, and Liang-Tien Chia. "Phase Fourier Reconstruction for Anomaly Detection on Metal Surface Using Salient Irregularity." In MultiMedia Modeling, 290–302. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51811-4_24.

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Sitenko, Yu A. "Anomaly Index and Induced Charge on a Noncompact Surface in an External Magnetic Field." In Electron-Electron Correlation Effects in Low-Dimensional Conductors and Superconductors, 48–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76753-1_6.

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Sun, Puyu, Chengfa Gao, Xinde Zhai, and Yongsheng Liu. "Application of Fitting of Moving Quadric Surface to Height Anomaly Fitting in the Band-Shaped Area." In Lecture Notes in Electrical Engineering, 166–75. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3707-3_16.

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Ogbechie, Alberto, Javier Díaz-Rozo, Pedro Larrañaga, and Concha Bielza. "Dynamic Bayesian Network-Based Anomaly Detection for In-Process Visual Inspection of Laser Surface Heat Treatment." In Machine Learning for Cyber Physical Systems, 17–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53806-7_3.

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An, Xueli, and Luoping Pan. "Vibration Adaptive Anomaly Detection of Hydropower Unit in Variable Condition Based on Moving Least Square Response Surface." In Lecture Notes in Computer Science, 146–54. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11897-0_17.

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Kenyon, S. C. "The Development by the National Imagery and Mapping Agency of a Global Surface Gravity Anomaly Database for the EGM96 Geopotential Model and Future Applications." In Geodesy on the Move, 99–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72245-5_12.

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Chand, R., and C. Singh. "Relation of Frequency of Tropical Cyclones Over North Indian Ocean and North West Pacific Ocean with Sea Surface Temperature Anomaly Over Nino 3.4 Region and Indian Ocean Dipole." In Tropical Cyclone Activity over the North Indian Ocean, 233–43. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40576-6_16.

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10

"surface anomaly." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1353. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_199146.

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Тези доповідей конференцій з теми "Surface anomaly"

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Schwenk*, J. Tyler, and Steven D. Sloan. "Anomaly detection using surface waves." In SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. http://dx.doi.org/10.1190/segam2015-5852010.1.

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Park, J., M. Vanneste, I. K. Waarum, P. M. Sparrevik, and G. Sauvin. "CSEM Data Sensitivity for Shallow Resistivity Anomaly." In Near Surface Geoscience 2014 - First Applied Shallow Marine Geophysics Conference. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20142125.

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Hoang, D. Dang, C. Le Van Anh, and T. Kieu Duy. "Ground Penetrating Radar Attribute for Analyzing Underground Anomaly." In 3rd Asia Pacific Meeting on Near Surface Geoscience & Engineering. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202071100.

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Schwenk, J. Tyler, and Steven Sloan. "Surface-wave methods for anomaly detection: A review." In SEG Technical Program Expanded Abstracts 2017. Society of Exploration Geophysicists, 2017. http://dx.doi.org/10.1190/segam2017-17793257.1.

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HAGINO, K., M. DASGUPTA, I. I. GONTCHAR, D. J. HINDE, C. R. MORTON, and J. O. NEWTON. "SURFACE DIFFUSENESS ANOMALY IN HEAVY-ION FUSION POTENTIALS." In Proceedings of the 4th Italy-Japan Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812791320_0011.

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Chai, Woon Huei, Shen-Shyang Ho, and Chi-Keong Goh. "Exploiting sparsity for image-based object surface anomaly detection." In 2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2016. http://dx.doi.org/10.1109/icassp.2016.7472024.

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Vaikundam, Sriram, Tzu-Yi Hung, and Liang Tien Chia. "Anomaly region detection and localization in metal surface inspection." In 2016 IEEE International Conference on Image Processing (ICIP). IEEE, 2016. http://dx.doi.org/10.1109/icip.2016.7532459.

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Hashemi, H., S. A. Razavi, and A. Nejati. "Gravity Analytic Signal Function as a Tool for Finding Anomaly Edges." In Near Surface 2005 - 11th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.13.b033.

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Wang, H., and C. P. Lin. "Effect of outside anomaly in the cross-hole electrical resistivity tomography." In EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800448.

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Vanhala, H., and I. Suppala. "Airborne EM – From Anomaly Hunting to 3D Mapping – A Case From Finland." In Near Surface 2005 - 11th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.13.a012.

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Звіти організацій з теми "Surface anomaly"

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Sepanski, R., T. Boden, and R. Daniels. An updated global grid point surface air temperature anomaly data set: 1851--1990. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/10109594.

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Sepanski, R., T. Boden, and R. Daniels. An updated global grid point surface air temperature anomaly data set: 1851--1990. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/6060247.

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ZHANG, Dongmei, Hui JIN, and Wei LIU. Spatial Trend Surface Analysis and Geochemical Anomaly Evaluation Based on Two Stage GEP Evolutionary Algorithm. Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0116.

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Jacobs, G., R. Broome, R. Leben, L. Russell, D. May, and C. Barron. Jason-2 Validation Test Report (VTR): Validation of Sea Surface Height Anomaly Precision and Accuracy for Mesoscale Applications. Fort Belvoir, VA: Defense Technical Information Center, May 2010. http://dx.doi.org/10.21236/ada522835.

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