Готові списки джерел за темами / Earthquake catalogue

Добірка наукової літератури з теми "Earthquake catalogue"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 21 лютого 2023

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Статті в журналах з теми "Earthquake catalogue"

1

Rajaure, Sudhir, and Lalu Prasad Paudel. "A comprehensive earthquake catalogue for Nepal and its adjoining region." Journal of Nepal Geological Society 56, no. 1 (June 28, 2018): 65–72. http://dx.doi.org/10.3126/jngs.v56i1.22747.

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We have prepared a comprehensive earthquake catalogue for Nepal and its adjoining region. The catalogue contains magnitude - homogenized independent earthquakes of magnitude (Mw) between 4.0 and 8.5, which occurred between 1100 AD and 2018 AD. The catalogue contains date, time, latitude, longitude, depth, and magnitude of earthquakes, which are required in the study of seismic activity, tectonics and seismic hazard. Primary earthquake catalogues were collected from the International Seismological Centre (ISC, 2015), United States Geological Survey (USGS), which contain instrumentally recorded earthquake data and date back to 1900 AD. These primary catalogues of instrumentally recorded earthquakes were supplemented by historical earthquakes reported in published literatures, which occurred before 1900 AD. The collected primary catalogues were compiled and processed to develop a comprehensive catalogue. The developed comprehensive catalogue is expected to serve as a basic database for the study of seismic activity and seismic hazard in Nepal and its adjacent area.
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2

Silva, Pablo G., Miguel A. Rodríguez-Pascua, Jorge L. Giner Robles, Javier Élez, Raúl Pérez-López, and M. Begoña Bautista Davila. "Catalogue of the Geological Effects of Earthquakes in Spain Based on the ESI-07 Macroseismic Scale: A New Database for Seismic Hazard Analysis." Geosciences 9, no. 8 (July 29, 2019): 334. http://dx.doi.org/10.3390/geosciences9080334.

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This paper summarizes the content and scope of the “Catalogue of Earthquake Geological Effects in Spain”. The catalogue has been published by the Geological Survey of Spain (IGME) and constitutes the first official publication (in Spain) on seismic hazard containing geological information. The catalogue gathers the 51 stronger earthquakes that have occurred in Spain since the Neolithic period to the present and classifies earthquakes with geological or archaeological seismic records in paleoseismic, ancient, historical and instrumental earthquakes. The catalogue offers a variety of parametric information, quality indexes (Qe, Qi, Qg), and Environmental Seismic Intensity Scale (ESI-07) based description of environmental damage structured in individual “event files”. Sixteen of the 51 catalogued events present full information files (full event files), with individualized analyses of the geological and geoarchaeological data as well as graphic information with hybrid ESI-EMS intensity maps, ShakeMaps (seismic scenarios) and complementary kmz files (Google Earth) for each of the sixteen selected earthquakes; among which is the well-known AD 1755 Lisbon earthquake-tsunami. These selected earthquakes present individual environmental earthquake effects (EEE) or earthquake archaeoseismological effects (EAE) files for each catalogued effect containing specific site geo-information and graphic data (photos, graphs, maps, etc.). The second edition of the catalogue record 1027 EEEs and 187 EAEs, of which 322 effects have individual files.
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3

Ghayournajarkar, Nematollah, and Yo Fukushima. "Using InSAR for evaluating the accuracy of locations and focal mechanism solutions of local earthquake catalogues." Geophysical Journal International 230, no. 1 (February 24, 2022): 607–22. http://dx.doi.org/10.1093/gji/ggac072.

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SUMMARY Earthquake source parameters play a fundamental role in evaluating seismic hazard. In many countries, the relatively low accuracy of the earthquake source parameters owing to sparse seismic monitoring networks prevents accurate seismic hazard evaluation. Interferometric Synthetic Aperture Radar (InSAR) is a useful tool for accurate fault parameter determination of shallow inland earthquakes. We compared the fault parameters (location and rupture geometry) derived from InSAR with those derived from local and global seismic data to assess the credibility of the earthquake catalogues. We set our targets to Iran and Japan, where seismic networks are relatively sparse and dense, respectively, and analysed a total of 10 shallow inland earthquakes. To compare the fault parameters for each studied earthquake, we first created interferograms using InSAR data from multiple satellites and conducted fault model inversions assuming uniform slip on a rectangular finite fault. For the studied Iranian earthquakes, the epicentres of the United States Geological Survey (USGS) catalogue were more consistent with the InSAR-derived fault model compared to those of the local catalogue of the Iranian Seismological Center (IRSC). For the studied Japanese earthquakes, the epicentres of the Japan Meteorological Agency (JMA) catalogue were more consistent with the InSAR-derived fault model compared to those of the USGS. Assuming that the accuracy of the USGS locations is comparable for the two countries, the JMA catalogue has a higher accuracy than the IRSC catalogue. The difference in the accuracy for the two local catalogues can be explained by the larger azimuthal gaps of the IRSC seismic network. We also showed that the IRSC- and JMA-derived centroids were more consistent with the InSAR-derived fault model compared to those of the Global Centroid Moment Tensor (GCMT) catalogue. The focal mechanism solutions derived from InSAR and seismic CMT solutions were significantly different, highlighting the difficulties in determining the focal mechanism parameters from seismic data, even when the seismic station coverage is dense. As InSAR data can be easily accessed, this study presents a cost-effective method to assess and improve the accuracy of the local earthquake catalogues anywhere in the world.
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4

Tan, Fengzhou, Honn Kao, Edwin Nissen, and Ryan Visser. "Tracking earthquake sequences in real time: application of Seismicity-Scanning based on Navigated Automatic Phase-picking (S-SNAP) to the 2019 Ridgecrest, California sequence." Geophysical Journal International 223, no. 3 (August 17, 2020): 1511–24. http://dx.doi.org/10.1093/gji/ggaa387.

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SUMMARY Recent improvements in seismic data processing techniques have enhanced our ability to detail the evolution of major earthquake sequences in space and time. One such advance is new scanning algorithms that allow large volumes of waveform data to be analysed automatically, removing human biases and inefficiencies that inhibit standardized monitoring. The Seismicity-Scanning based on Navigated Automatic Phase-picking (S-SNAP) workflow has previously been shown to be capable of producing high-quality earthquake catalogues for injection-induced seismicity monitoring. In this study, we modify the original S-SNAP workflow to enable it to delineate the spatiotemporal distribution of major earthquake sequences in real time. We apply it to the 2019 Ridgecrest, southern California earthquake sequence, which culminated in an Mw 6.4 foreshock on July 4 and an Mw 7.1 main shock on July 6 and generated tens of thousands of smaller earthquakes. Our catalogue—which spans the period 2019 June 1 to July 16—details the spatiotemporal evolution of the sequence, including early foreshocks on July 1 and accelerating foreshocks on July 4, a seismicity gap before the main shock around its epicentre, seismicity on discrete structures within a broad fault zone and triggered earthquakes outside the main fault zone. We estimate the accuracy and false detection rate of the S-SNAP catalogue based on the reviewed catalogue reported by Southern California Seismic Network (SCSN) and our own visual inspection. We demonstrate the advantages of S-SNAP over a generalized automatic earthquake monitoring software, Seiscomp3, and a customized real-time earthquake information system for southern California, TriNet. In comparison, the S-SNAP catalogue contains five times more events than the Seiscomp3 catalogue and 1.4–2.2 times as many events per hour as the TriNet catalogue at most times. In addition, S-SNAP is more likely to solve phase association ambiguities correctly and provide a catalogue with consistent quality through time. S-SNAP would be beneficial to both routine network operations and the earthquake review process.
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5

Rhoades, David A., Sepideh J. Rastin, and Annemarie Christophersen. "A 20-Year Journey of Forecasting with the “Every Earthquake a Precursor According to Scale” Model." Geosciences 12, no. 9 (September 19, 2022): 349. http://dx.doi.org/10.3390/geosciences12090349.

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Анотація:
Nearly 20 years ago, the observation that major earthquakes are generally preceded by an increase in the seismicity rate on a timescale from months to decades was embedded in the “Every Earthquake a Precursor According to Scale” (EEPAS) model. EEPAS has since been successfully applied to regional real-world and synthetic earthquake catalogues to forecast future earthquake occurrence rates with time horizons up to a few decades. When combined with aftershock models, its forecasting performance is improved for short time horizons. As a result, EEPAS has been included as the medium-term component in public earthquake forecasts in New Zealand. EEPAS has been modified to advance its forecasting performance despite data limitations. One modification is to compensate for missing precursory earthquakes. Precursory earthquakes can be missing because of the time-lag between the end of a catalogue and the time at which a forecast applies or the limited lead time from the start of the catalogue to a target earthquake. An observed space-time trade-off in precursory seismicity, which affects the EEPAS scaling parameters for area and time, also can be used to improve forecasting performance. Systematic analysis of EEPAS performance on synthetic catalogues suggests that regional variations in EEPAS parameters can be explained by regional variations in the long-term earthquake rate. Integration of all these developments is needed to meet the challenge of producing a global EEPAS model.
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6

Kagan, Y. Y. "Distribution of incremental static stress caused by earthquakes." Nonlinear Processes in Geophysics 1, no. 2/3 (September 30, 1994): 172–81. http://dx.doi.org/10.5194/npg-1-172-1994.

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Abstract. Theoretical calculations, simulations and measurements of rotation of earthquake focal mechanisms suggest that the stress in earthquake focal zones follows the Cauchy distribution which is one of the stable probability distributions (with the value of the exponent α equal to 1). We review the properties of the stable distributions and show that the Cauchy distribution is expected to approximate the stress caused by earthquakes occurring over geologically long intervals of a fault zone development. However, the stress caused by recent earthquakes recorded in instrumental catalogues, should follow symmetric stable distributions with the value of α significantly less than one. This is explained by a fractal distribution of earthquake hypocentres: the dimension of a hypocentre set, δ, is close to zero for short-term earthquake catalogues and asymptotically approaches 2¼ for long-time intervals. We use the Harvard catalogue of seismic moment tensor solutions to investigate the distribution of incremental static stress caused by earthquakes. The stress measured in the focal zone of each event is approximated by stable distributions. In agreement with theoretical considerations, the exponent value of the distribution approaches zero as the time span of an earthquake catalogue (ΔT) decreases. For large stress values α increases. We surmise that it is caused by the δ increase for small inter-earthquake distances due to location errors.
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7

Jónasson, Kristján, Bjarni Bessason, Ásdís Helgadóttir, Páll Einarsson, Gunnar B. Guðmundsson, Bryndís Brandsdóttir, Kristín S. Vogfjörd, and Kristín Jónsdóttir. "A harmonised instrumental earthquake catalogue for Iceland and the northern Mid-Atlantic Ridge." Natural Hazards and Earth System Sciences 21, no. 7 (July 21, 2021): 2197–214. http://dx.doi.org/10.5194/nhess-21-2197-2021.

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Abstract. A comprehensive catalogue of historical earthquakes, with accurate epicentres and harmonised magnitudes is a crucial resource for seismic hazard mapping. Here we update and combine catalogues from several sources to compile a catalogue of earthquakes in and near Iceland, in the years 1900–2019. In particular the epicentres are based on local information, whereas the magnitudes are based on teleseismic observations, primarily from international online catalogues. The most reliable epicentre information comes from the catalogue of the Icelandic Meteorological Office, but this is complemented with information from several technical reports, scientific publications, and newspaper articles. The catalogue contains 1281 moment magnitude (Mw) ≥4 events, and the estimated completeness magnitude is Mw 5.5 in the first years, going down to Mw 4.5 for recent years. The largest magnitude is Mw 7.0. Such merging of local data and teleseismic catalogues has not been done before for Icelandic earthquakes, and the result is an earthquake map with much more accurate locations than earlier maps. The catalogue also lists 5640 additional earthquakes on the Mid-Atlantic Ridge, north of 43∘, with both epicentres and magnitudes determined teleseismically. When moment magnitudes are not available, proxy Mw values are computed using χ2 regression, normally on the surface-wave magnitude but exceptionally on the body-wave magnitude. Magnitudes of Mw≥4.5 have associated uncertainty estimates. The actual combined seismic moment released in the Icelandic earthquakes is found to be consistent with the moment estimated using a simple plate motion model, indicating that the seismic activity of the catalogue period might be typical of any 120-year time span. The catalogue is named ICEL-NMAR, and it is available online at http://data.mendeley.com (last access: 19 July 2021).
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8

Rovida, Andrea, Andrea Antonucci, and Mario Locati. "The European Preinstrumental Earthquake Catalogue EPICA, the 1000–1899 catalogue for the European Seismic Hazard Model 2020." Earth System Science Data 14, no. 12 (November 30, 2022): 5213–31. http://dx.doi.org/10.5194/essd-14-5213-2022.

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Abstract. The European PreInstrumental Earthquake CAtalogue (EPICA) (Rovida and Antonucci, 2021; https://doi.org/10.13127/epica.1.1) is the 1000–1899 seismic catalogue compiled for the European Seismic Hazard Model 2020 (ESHM20), an outcome of the project Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe (SERA), in the framework of the European Union's Horizon 2020 research and innovation programme. EPICA is the update of the SHARE European Earthquake Catalogue (SHEEC) 1000–1899, with which it shares the main principles – mostly transparency, repeatability and continent-wide harmonisation of data – as well as the compilation strategies and methods. Version 1.1 of EPICA contains 5703 earthquakes with either maximum intensity ≥5 or Mw≥4.0, with a spatial coverage from the Atlantic Ocean to the west to 32∘ E in longitude, and from the Mediterranean Sea to Northern Europe. EPICA relies upon the updated knowledge of the European preinstrumental seismicity provided by the data gathered in the European Archive of Historical Earthquake Data (AHEAD). Such data are both macroseismic intensity data supplied by descriptive historical seismological studies and online macroseismic databases, and parameters contained in regional catalogues. As done for the compilation of SHEEC 1000–1899, these datasets were thoroughly analysed in order to select the most representative of the knowledge of each earthquake, independently from national constraints. Selected intensity distributions are processed with three methods to determine location and magnitude based on the attenuation of macroseismic intensity and are combined with parameters harmonised from modern regional catalogues. This paper describes the compilation procedure of EPICA version 1.1, its input data, the assessment of the earthquake parameters and the resulting catalogue, which is finally compared with its previous version. Technical solutions for accessing the catalogue, both as downloadable files and through web services, are also illustrated.
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9

Pailoplee, Santi. "Earthquake Catalogue of the Thailand Meteorological Department — A Commentary." Journal of Earthquake and Tsunami 08, no. 05 (December 2014): 1471001. http://dx.doi.org/10.1142/s1793431114710018.

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In this study, I investigated qualitatively the earthquake catalogue of the Thai Meteorological Department (TMD), Thailand, with respect to the seismicity patterns of Thailand. The readymade relationships between the different magnitude scales were derived to allow their convenient interconversion. Earthquake declustering was performed in order to screen the main shocks from the foreshocks and aftershocks, reducing the 1998–2009 records from ~48,900 to 2,620 main events. Man-made changes in the seismicity rate were carefully checked for, but only some minor changes were found and these were not related to any network improvements. In order to assess the limit of the earthquake detection in the catalogue the criterion of the magnitude of completeness (Mc) was employed, revealing a high efficiency of earthquake detection at a low Mc (3.0–3.5 Mw), especially for the inland active fault zone that dominates in Southeast Asia. Thus, the TMD's catalogue is one of the alternative catalogues for seismicity investigation of inland earthquakes. Meanwhile for the area surrounding the Sumatra Island and Northern Myanmar, the TMD's network is sufficient only for earthquakes with a Mw > 5.4–6.0 Mw. Thus, some additional seismic recording stations are needed in the Southern and Northern parts of Thailand.
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10

Bayliss, T. J., and P. W. Burton. "A new earthquake catalogue for Bulgaria and the conterminous Balkan high hazard region." Natural Hazards and Earth System Sciences 7, no. 3 (May 10, 2007): 345–59. http://dx.doi.org/10.5194/nhess-7-345-2007.

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Abstract. A new homogenous earthquake catalogue covering Bulgaria and the surrounding Balkan area has been created with intention of performing a consistent seismic hazard assessment across the region. In keeping with modern requirements of cataloguing seismicity, this catalogue has been made homogenous as far as possible with regards to magnitude, which has been provided on any of four different reported scales for each event; mb, Ms, Mw and ML. A key historical catalogue for the region has been used to represent the early instrumental period of earthquake recording (1900 to 1963), whilst data have been obtained from the International Seismological Centre (ISC), National Earthquake Information Center (NEIC) and National Observatory of Athens (NOA) to cover the instrumental period of earthquake recording (1964 to 2004). ISC data have also been used to develop a new mb→Ms magnitude conversion equation for the catalogued region. Application of this new magnitude conversion relation, in combination with other selected magnitude scale correlations, ensures reported magnitudes can be systematically rendered onto homogenized Ms and Mw scales for all earthquakes. This catalogue contains 3681 events with homogenized magnitudes ≥4.0 Mw, for the time interval 1900 to 2004 (inclusive), located in the region bounded by 39°–45° N, 19°–29° E, at focal depths of 0.0 km to 401.0 km and in a magnitude range 4.0≤Mw≤7.2. Selected large magnitude (M≥6.0 Ms) earthquakes have had their reported magnitudes reassessed – and adjusted if necessary – in light of work by other authors. Applied statistical approaches aimed at determining the lower threshold to magnitude completeness suggest this catalogue is complete down to a homogenized surface-wave magnitude of 4.6 Ms.
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Більше джерел

Дисертації з теми "Earthquake catalogue"

1

TRIANNI, SARA CRISTINA TERESA. "Probabilistic seismic hazard assessment at a strategic site in the bay of Bengal." Doctoral thesis, Università Politecnica delle Marche, 2013. http://hdl.handle.net/11566/242592.

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Анотація:
Il lavoro di ricerca ha avuto in oggetto la quantificazione probabilistica della pericolosità sismica lungo la rotta di una condotta per il trasporto di crudo nel Golfo del Bengala. L’esito dell’analisi è stato espresso in termini di spettri di risposta elastici medi dell’accelerazione orizzontale e in presenza di deviazione standard, riferiti a cinque periodi di ritorno (Tr =95, 225, 475, 975 e 2475 anni). Inoltre, due mappe di pericolosità sismica riferite all’accelerazione di picco orizzontale e all’accelerazione spettrale di periodo T=0.2 sec sono state prodotte per il territorio del Bangladesh e le regioni circostanti. L’analisi è stata eseguita secondo il metodo classico di Cornell-McGuire e introducendo in aggiunta un lineamento tettonico per il quale è stato applicato il modello del terremoto caratteristico. Un catalogo degli eventi sismici è stato compilato per un’area estesa circondante la condotta, consultando numerose fonti internazionali e regionali, riferito al periodo 1663-2012. I dati del catalogo sono stati successivamente sottoposti a un processo di rimozione delle repliche, omogeneizzazione, rimozione degli eventi dipendenti (precursori e repliche) e analisi di completezza. Differenti scenari tettonici presenti nell’area di studio sono stati considerati per la selezione di opportune relazioni di attenuazione. Un approccio ad albero logico, costituito da cinquantadue rami è stato adottato per tenere conto dell’incertezza epistemica. L’analisi dei valori degli spettri di accelerazione ha evidenziato un cambiamento considerevole del livello di pericolosità in diversi punti della condotta, specie per elevati periodi di ritorno (Tr= 975 e 2475 anni), giustificando la necessità di uno studio specifico lungo la rotta. Inoltre, le mappe di pericolosità ottenute hanno riportato valori molto maggiori rispetto a quelli indicati in letteratura, portando alla conclusione che gli studi probabilistici precedenti sottostimano la pericolosità sismica per la maggior parte dei distretti del Bangladesh.
The scope of the study was to perform the probabilistic seismic hazard assessment (PSHA) along the route of an offshore pipeline for the transport of oil in the Bay of Bengal. The outcome of the seismic hazard analysis is given in terms of horizontal median uniform hazard spectra and plus and minus one sigma for five return periods (i.e., Tr= 95, 225, 475, 975, and 2475 years), in correspondence of four selected sites of the pipeline route. In addition, two seismic hazard maps for horizontal peak acceleration and spectral acceleration at T=0.2 sec with 475 year-return period are provided, extending in Bangladesh and neighbourhood regions. PSHA was performed as per classical Cornell-McGuire approach, and introducing in addition a tectonic lineament for which the model of “characteristic earthquake” was applied. A comprehensive earthquake catalogue was produced for a large area surrounding the pipeline, consulting numerous international and local sources, spanning the period 1663-2012 A.D. Processing of the data of the catalogue was performed, consisting in removing of duplicate events, homogenising, declustering, and analysis of completeness periods for different magnitude ranges. Different tectonic environments within the study area were accounted for in the selection of appropriate ground-motion prediction equations. A logic-tree framework constituted by 52 branches was adopted in the computation for taking into account epistemic uncertainties. The analysis of the values of UHSs at different selected sites has pointed out the change of the level of hazard along the route of the pipeline, justifying the need for performing a specific hazard assessment along it. Moreover, the comparison of the hazard maps whit those available in literature, has showed higher values of hazard in the performed study, which leads to consider that for most districts of Bangladesh the earlier probabilistic hazard analyses underestimate the seismic hazard considerably.
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2

Adamaki, Angeliki. "Seismicity Analyses Using Dense Network Data : Catalogue Statistics and Possible Foreshocks Investigated Using Empirical and Synthetic Data." Doctoral thesis, Uppsala universitet, Geofysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328057.

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Анотація:
Precursors related to seismicity patterns are probably the most promising phenomena for short-term earthquake forecasting, although it remains unclear if such forecasting is possible. Foreshock activity has often been recorded but its possible use as indicator of coming larger events is still debated due to the limited number of unambiguously observed foreshocks. Seismicity data which is inadequate in volume or character might be one of the reasons foreshocks cannot easily be identified. One method used to investigate the possible presence of generic seismicity behavior preceding larger events is the aggregation of seismicity series. Sequences preceding mainshocks chosen from empirical data are superimposed, revealing an increasing average seismicity rate prior to the mainshocks. Such an increase could result from the tendency of seismicity to cluster in space and time, thus the observed patterns could be of limited predictive value. Randomized tests using the empirical catalogues imply that the observed increasing rate is statistically significant compared to an increase due to simple clustering, indicating the existence of genuine foreshocks, somehow mechanically related to their mainshocks. If network sensitivity increases, the identification of foreshocks as such may improve. The possibility of improved identification of foreshock sequences is tested using synthetic data, produced with specific assumptions about the earthquake process. Complications related to background activity and aftershock production are investigated numerically, in generalized cases and in data-based scenarios. Catalogues including smaller, and thereby more, earthquakes can probably contribute to better understanding the earthquake processes and to the future of earthquake forecasting. An important aspect in such seismicity studies is the correct estimation of the empirical catalogue properties, including the magnitude of completeness (Mc) and the b-value. The potential influence of errors in the reported magnitudes in an earthquake catalogue on the estimation of Mc and b-value is investigated using synthetic magnitude catalogues, contaminated with Gaussian error. The effectiveness of different algorithms for Mc and b-value estimation are discussed. The sample size and the error level seem to affect the estimation of b-value, with implications for the reliability of the assessment of the future rate of large events and thus of seismic hazard.
Οι προσεισμοί αποτελούν τα πλέον υποσχόμενα πρόδρομα φαινόμενα για τη βραχυπρόθεσμη πρόγνωση των σεισμών, παρόλο που παραμένει άγνωστο το αν μια τέτοια πρόγνωση είναι εφικτή. Η χρήση της προσεισμικής δραστηριότητας ως ένδειξη ενός επερχόμενου μεγάλου σεισμού είναι αμφιλεγόμενη, κυρίως λόγω του περιορισμένου πλήθους των προσεισμών, γεγονός που πιθανά οφείλεται στην ανεπαρκή καταγραφή σεισμικών δεδομένων. Η άθροιση σεισμικών σειρών είναι μια μέθοδος που εφαρμόζεται προκειμένου να μελετηθεί η πιθανή παρουσία ενός γενικευμένου μοτίβου σεισμικότητας πριν από ισχυρούς σεισμούς. Η υπέρθεση σεισμικών ακολουθιών που προηγήθηκαν των κυρίων σεισμών αναδεικνύει μια αυξανόμενη μέση δραστηριότητα πριν από τους κύριους σεισμούς. Μια τέτοια συμπεριφορά θα μπορούσε να προκύψει και από την εγγενή τάση των σεισμών να ομαδοποιούνται χωρικά και χρονικά, με αποτέλεσμα τα παρατηρούμενα μοτίβα να έχουν περιορισμένη προγνωστική αξία. Τυχαιοποιημένοι έλεγχοι των πραγματικών δεδομένων υποδηλώνουν ότι ο παρατηρούμενος αυξανόμενος ρυθμός είναι στατιστικά σημαντικός σε σύγκριση με τη μεταβολή που οφείλεται στη γένεση απλών συστάδων σεισμών, αναδεικνύοντας την ύπαρξη προσεισμών αιτιολογικά συσχετιζόμενων με τους κύριους σεισμούς. Μια ενδεχόμενη αύξηση της ευαισθησίας των σεισμικών δικτύων πιθανά να συμβάλει στην αποτελεσματικότερη αναγνώριση των προσεισμών. Η πιθανότητα μιας τέτοιας βελτίωσης ελέγχεται με τη χρήση συνθετικών δεδομένων τα οποία προκύπτουν υπό προϋποθέσεις ως προς τη σεισμική διαδικασία. Οι επιπλοκές που μπορεί να προκύψουν από την παρουσία σεισμικότητας υποβάθρου και των μετασεισμικών ακολουθιών διερευνώνται αριθμητικά, με γενικευμένες περιπτώσεις και σενάρια που βασίζονται σε πραγματικά δεδομένα. Οι κατάλογοι που περιλαμβάνουν μικρότερους και επομένως περισσότερους σεισμούς μπορούν πιθανώς να συμβάλουν στην καλύτερη κατανόηση των σεισμικών διεργασιών και στη μελλοντική πρόγνωση των σεισμών. Σημαντική πτυχή σε τέτοιες μελέτες αποτελεί η σωστή εκτίμηση των ιδιοτήτων των σεισμικών καταλόγων, όπως είναι το μέγεθος πληρότητας και η παράμετρος b. Η επίδραση των σφαλμάτων των μεγεθών που υπάρχουν στους σεισμικούς καταλόγους στην εκτίμηση των προαναφερθέντων ιδιοτήτων ερευνάται χρησιμοποιώντας συνθετικά μεγέθη στα οποία ενυπάρχουν κανονικώς κατανεμημένα σφάλματα. Κατά τη διερεύνηση της αποτελεσματικότητας των διαφόρων μεθόδων που χρησιμοποιούνται για την εκτίμηση του μεγέθους πληρότητας προκύπτει ότι το μέγεθος του δείγματος και του σφάλματος των μεγεθών μπορούν να επηρεάσουν την εκτίμηση της παραμέτρου b, με επιπτώσεις στην εκτίμηση του ρυθμού των μελλοντικών ισχυρών σεισμών και την αξιολόγηση του σεισμικού κινδύνου.
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3

Van, Dyck Jozef Frans Maria. "Statistical analysis of earthquake catalogs." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/42969.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaves 262-269.
by Jozef Frans Maria Van Dyck.
Ph.D.
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4

Nyffenegger, Paul A. "Aftershock occurrence rate decay for individual sequences and catalogs /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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5

Jorgic, Mladen. "Evaluation of magnitude recurrence parameters based on a global earthquake catalog." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ57795.pdf.

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6

Li, Ka Lok. "A Strategy for Earthquake Catalog Relocations Using a Maximum Likelihood Method." Thesis, Uppsala universitet, Geofysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-188826.

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A strategy for relocating earthquakes in a catalog is presented. The strategy is based on the argument that the distribution of the earthquake events in a catalog is reasonable a priori information for earthquake relocation in that region. This argument can be implemented using the method of maximum likelihood for arrival time data inversion, where the a priori probability distribution of the event locations is defined as the sum of the probability densities of all events in the catalog. This a priori distribution is then added to the standard misfit criterion in earthquake location to form the likelihood function. The probability density of an event in the catalog is described by a Gaussian probability density. The a priori probability distribution is, therefore, defined as the normalized sum of the Gaussian probability densities of all events in the catalog, excluding the event being relocated. For a linear problem, the likelihood function can be approximated by the joint probability density of the a priori distribution and the distribution of an unconstrained location due to the misfit alone. After relocating the events according to the maximum of the likelihood function, a modified distribution of events is generated. This distribution should be more densely clustered than before in general since the events are moved towards the maximum of the posterior distribution. The a priori distribution is updated and the process is iterated. The strategy is applied to the aftershock sequence in southwest Iceland after a pair of earthquakes on 29th May 2008. The relocated events reveal the fault systems in that area. Three synthetic data sets are used to test the general behaviour of the strategy. It is observed that the synthetic data give significantly different behaviour from the real data.
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7

Jorgic, Mladen Carleton University Dissertation Earth Sciences. "Evaluation of magnitude recurrence parameters based on a global earthquake catalog." Ottawa, 2000.

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8

Hiemer, Stefan, Dirk Rößler, and Frank Scherbaum. "Catalog of Swarm Earthquakes in Vogtland /West Bohemia in 2008/09." Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2011/5171/.

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The document contains the catalog of earthquakes in Vogtland /West Bohemia within the period of 2008/10/19 -to- 2009/03/16. The events were recorded by a seismic mini-array operated by the Institute of Earthsciences, University of Postdam.
Das Dokument enthält einen Katalog von Erdbeben im Vogtland/Westböhmen im Zeitraum 2008/10/19 -bis- 2009/03/16. Die Erdbeben wurden mit Hilfe eines seismologischen Miniarrays, welches vom Institut für Geowissenschaften, Universität Potsdam, aufgestellt wurde, registriert.
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9

Werner, Maximilian Jonas. "On the fluctuations of seismicity and uncertainties in earthquake catalogs implications and methods for hypothesis testing /." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1666898521&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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10

Li, Ka Lok. "Location and Relocation of Seismic Sources." Doctoral thesis, Uppsala universitet, Geofysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-327038.

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This dissertation is a comprehensive summary of four papers on the development and application of new strategies for locating tremor and relocating events in earthquake catalogs. In the first paper, two new strategies for relocating events in a catalog are introduced. The seismicity pattern of an earthquake catalog is often used to delineate seismically active faults. However, the delineation is often hindered by the diffuseness of earthquake locations in the catalog. To reduce the diffuseness and simplify the seismicity pattern, a relocation and a collapsing method are developed and applied. The relocation method uses the catalog event density as an a priori constraint for relocations in a Bayesian inversion. The catalog event density is expressed in terms of the combined probability distribution of all events in the catalog. The collapsing method uses the same catalog density as an attractor for focusing the seismicity in an iterative scheme. These two strategies are applied to an aftershock sequence after a pair of earthquakes which occurred in southwest Iceland, 2008. The seismicity pattern is simplified by application of the methods and the faults of the mainshocks are delineated by the reworked catalog. In the second paper, the spatial distribution of seismicity of the Hengill region, southwest Iceland is analyzed. The relocation and collapsing methods developed in the first paper and a non-linear relocation strategy using empirical traveltime tables are used to process a catalog collected by the Icelandic Meteorological Office. The reworked catalog reproduces details of the spatial distribution of seismicity that independently emerges from relative relocations of a small subset of the catalog events. The processed catalog is then used to estimate the depth to the brittle-ductile transition. The estimates show that in general the northern part of the area, dominated by volcanic processes, has a shallower depth than the southern part, where tectonic deformation predominates. In the third and the fourth papers, two back-projection methods using inter-station cross correlations are proposed for locating tremor sources. For the first method, double correlations, defined as the cross correlations of correlations from two station pairs sharing a common reference station, are back projected. For the second method, the products of correlation envelopes from a group of stations sharing a common reference station are back projected. Back projecting these combinations of correlations, instead of single correlations, suppresses random noise and reduces the strong geometrical signature caused by the station configuration. These two methods are tested with volcanic tremor at Katla volcano, Iceland. The inferred source locations agree with surface observations related to volcanic events which occurred during the tremor period.
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Книги з теми "Earthquake catalogue"

1

Catalogue of felt earthquake reports in Fiji, 1941-1981. Suva, Fiji: Mineral Resources Dept., 1988.

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2

Lari, Yasmeen. Azad Jammu & Kashmir: Catalogue of heritage assests in earthquake 2005 affected areas. Edited by Heritage Foundation (Pakistan). Karachi: Heritage Foundation, 2010.

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3

Ranguelov, Boyko. The earthquake (M 7.8) source zone: South-west Bulgaria : full catalogue and macroseismic maps. Sofia: Professor Marin Drinov Academic Pub. House, 2001.

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4

Gangrade, Bhupesh Kumar. Seismicity of peninsular India and earthquake catalogue based on Gauribidanur seismic array data. Mumbai: Scientific Information Resource Division, Bhabha Atomic Research Centre, 2012.

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5

Ambraseys, N. N. Seismicity of Central America: A descriptive catalogue, 1898-1995. London: Imperial College Press, 2001.

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6

Güçlü, Uğur. Türkiye ve çevresi deprem kataloğu, (1971-1975) =: A catalogue of eartquakes of Turkey and surrounding area (1971-1975). İstabul: İstanbul Teknik Üniversitesi, 1986.

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7

Alexandre, Pierre. Les séismes en Europe occidentale de 394 à 1259: Nouveau catalogue critique. Bruxelles: Observatoire royal de Belgique, 1990.

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8

Hara, Yumiko. 3.11 no kiroku: Higashi Nihon Daishinsai shiryō sōran : Terebi tokushū bangumi hen. Tōkyō: Nichigai Asoshiētsu, 2014.

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9

United States. Federal Emergency Management Agency. Catalog of FEMA earthquake resources. Washignton, DC]: U.S. Department of Homeland Security, Federal Emergency Management Agency, NEHRP, 2013.

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10

Council for Geoscience (South Africa). Catalogue of earthquakes in Southern Africa and surrounding oceans for 1996. Silverton, Pretoria: Council for Geoscience, 2001.

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Частини книг з теми "Earthquake catalogue"

1

Guerrieri, Luca, Alessandro Maria Michetti, and Pablo G. Silva. "EEE Catalogue: A Global Database of Earthquake Environmental Effects." In Encyclopedia of Earthquake Engineering, 1–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36197-5_32-1.

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2

Guerrieri, Luca, Alessandro Maria Michetti, and Pablo G. Silva. "EEE Catalogue: A Global Database of Earthquake Environmental Effects." In Encyclopedia of Earthquake Engineering, 932–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-35344-4_32.

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3

Oncescu, Mihnea C., Vasile I. Marza, Mihaela Rizescu, and Mihaela Popa. "The Romanian Earthquake Catalogue Between 984 – 1997." In Vrancea Earthquakes: Tectonics, Hazard and Risk Mitigation, 43–47. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4748-4_4.

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4

Kondorskaya, N. V., Ye A. Khrometskaya, Ye B. Chirkov, D. A. Storchak, A. I. Zacharova, and L. S. Chepkunas. "A Regional Instrumental Earthquake Catalogue for the Caucasus." In Historical and Prehistorical Earthquakes in the Caucasus, 443–56. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5464-2_20.

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5

Osher, B. "Statistical Estimation of the Maximum Magnitude and its Uncertainty from a Catalogue Including Magnitude Errors." In Earthquake Hazard and Risk, 25–37. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0243-5_3.

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6

Stucchi, M., and R. Camassi. "Building up a Parametric Earthquake Catalogue in Europe: The Historical Background." In Historical and Prehistorical Earthquakes in the Caucasus, 357–74. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5464-2_16.

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7

Sawires, Rashad, José A. Peláez, Raafat E. Fat-Helbary, and Hamza A. Ibrahim. "An Earthquake Catalogue (2200 B.C. to 2013) for Seismotectonic and Seismic Hazard Assessment Studies in Egypt." In Earthquakes and Their Impact on Society, 97–136. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21753-6_4.

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8

Bălă, Andrei, Mircea Radulian, Emilia Popescu, and Dragoş Toma-Danilă. "Catalogue of Earthquake Mechanism and Correlation with the Most Active Seismic Zones in South-Eastern Part of Romania." In Seismic Hazard and Risk Assessment, 23–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74724-8_2.

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9

Shebalin, N. V., and R. E. Tatevossian. "Catalogue of Large Historical Earthquakes of the Caucasus." In Historical and Prehistorical Earthquakes in the Caucasus, 201–32. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5464-2_12.

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10

Llácer, David, Beatriz Otero, Rubén Tous, Marisol Monterrubio-Velasco, José Carlos Carrasco-Jiménez, and Otilio Rojas. "Random Forest Parameterization for Earthquake Catalog Generation." In Machine Learning, Optimization, and Data Science, 233–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64583-0_22.

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Тези доповідей конференцій з теми "Earthquake catalogue"

1

Kohns, Julia, and Lothar Stempniewski. "Classification of earthquake-induced building damage using innovative methods." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1366.

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<p>In the event of an earthquake, damaged and destroyed buildings are of central importance. Using a combination of automatic approaches and human crowdsourced visual interpretation based on unmanned aerial vehicle (UAV) derived data for the classification of earthquake damage offers a fast and objective assessment of the damage situation. Earthquake engineering knowledge is transferred to these innovative methods by developing and implementing a damage catalogue. This damage catalogue includes typical damage patterns for five damage grades ranging from crack widths to failure modes and focuses on the two common building materials - reinforced concrete and masonry. This paper presents the structure of such damage catalogue, defines crack widths and gives examples for particular damage grades. Moreover, the application of the damage catalogue in automatic and crowdsourcing approaches for a classification into five damage grades is explained.</p>
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2

Kohns, Julia, and Lothar Stempniewski. "Classification of earthquake-induced building damage using innovative methods." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1366.

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<p>In the event of an earthquake, damaged and destroyed buildings are of central importance. Using a combination of automatic approaches and human crowdsourced visual interpretation based on unmanned aerial vehicle (UAV) derived data for the classification of earthquake damage offers a fast and objective assessment of the damage situation. Earthquake engineering knowledge is transferred to these innovative methods by developing and implementing a damage catalogue. This damage catalogue includes typical damage patterns for five damage grades ranging from crack widths to failure modes and focuses on the two common building materials - reinforced concrete and masonry. This paper presents the structure of such damage catalogue, defines crack widths and gives examples for particular damage grades. Moreover, the application of the damage catalogue in automatic and crowdsourcing approaches for a classification into five damage grades is explained.</p>
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3

Bozza, Anna, Domenico Asprone, Fatemeh Jalayer, and Gaetano Manfredi. "HOW CAN INSURERS GET PREPARED TO CATASTROPHES? ASSESSING EARTHQUAKE EXPECTED LOSSES FROM HISTORICAL CATALOGUE." In 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2015. http://dx.doi.org/10.7712/120115.3656.1116.

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4

Xu, G. Y., S. Y. Wang, A. J. Gao, and S. Demberel. "Study on the Earthquake Catalogue and the Seismicity of North China, Mongolia, and Adjacent Areas." In Seventh China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480342.059.

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5

Sbrogio', Luca, Ylenia Saretta, and Maria Rosa Valluzzi. "An architectural catalogue for the study of traditional building features from their seismic behaviour in 2016 Central Italy earthquake." In HERITAGE2022 International Conference on Vernacular Heritage: Culture, People and Sustainability. Valencia: Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/heritage2022.2022.15155.

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The preservation of vernacular architecture is grounded on the study of those building techniques adopted in the past, when know-how and craftmanship (the rule-of-thumb for a well-arranged building) governed the spontaneous construction. The advent of new industrial materials and the progressive impoverishment of constructive skills caused the loss of traditional architectural features in favour of a standardized construction, often concealed from the outside. In the framework of the actual debate about the reconstruction of earthquake damaged historical centres, traditional building techniques and materials may play an effective role, as an alternative to a purely aesthetic appreciation and conservation of vernacular architecture. This contribution deals with the features of vernacular architecture in the area hit by the 2016 Central Italy earthquake, taking advantage of systematic observations of the built heritage in its context. The appearance of a building was subdivided in ‘volume, ‘surface’ and ‘components &amp; materials’, and per each theme, those architectural features which played a role in the seismic performance of a building were collected. This led to the proposal of a catalogue which relates geometric and morphological features to structural ones, as a function of the local construction traditions and the architectural appearance of the townscape. Structural interventions applied over time were also recognized, categorizing them in ‘spontaneous’, ‘standardized’ and ‘designed’. As in vernacular buildings architectural choices reflect on the structural behaviour, this catalogue and other similar ones are essential for actions (interventions or reconstruction) which are respectful of the built heritage and its values.
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6

Kc, B., A. Amirlatifi, and E. Ghazanfari. "Improved Relationships of Moment Magnitude with Regional and Local Magnitudes for Earthquakes in the United States." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-0712.

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ABSTRACT: The moment magnitude is the preferred magnitude to characterize the earthquake source. Moment magnitudes (Mw) are calculated from moment tensor inversion. In contrast, the regional short period surface-wave magnitude (Mblg) and local magnitude (ML) are calculated using the amplitude of the Lg surface waves and maximum horizontal amplitude measured by the seismograph, respectively. Moment magnitudes are inaccurate for small earthquakes (Magnitude &lt; 3.5) and if the waveforms used in the moment tensor inversion are recorded in stations with inadequate azimuthal coverage for the earthquake. In such cases, the moment magnitude is estimated using other available magnitudes. Due to the difference in bedrock geology and anelastic attenuation coefficient, the National Earthquake Information Center (NEIC) uses different magnitudes for the Central Eastern (i.e., Mblg) and the Western (i.e., ML) United States. This study uses the Saint Louis University earthquake catalog to develop improved relationships of moment magnitude with the regional magnitude (Mblg) in the Central Eastern U.S., and the local magnitude (ML) for the Western U.S. to accurately estimate moment magnitude when the moment tensor inversion is unavailable. 1. INTRODUCTION Earthquake magnitude is a commonly accepted tool to quantitatively describe the size and severity of an earthquake. During an earthquake event, seismic energy at the hypocenter is radiated through the earth in different waveforms, i.e., body waves (P and S waves) and surface waves (Rayleigh and Love waves), which are recorded by the seismometers on the earth’s surface. In 1935, Charles F. Richter introduced the concept of measuring the earthquake magnitude based on the maximum amplitude of the waveform recorded in a particular type of seismograph (Woods - Anderson torsion instrument) in southern California (Richter (1935)). Richter magnitude (ML) developed by Richter (1935) was only valid for southern California for specific frequency and distance ranges. Thus, several magnitude scales were developed based on the amplitude of the specific type of seismic waves within specified frequency ranges to account for the regional anelastic attenuation of the waveforms and measure the earthquakes in regions other than southern California (e.g., USGS (2022a)).
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Anadolu Kılıç, N. C. "Determination of Earthquake Hazard Parameters Using Different Eartquakes Catalogues in İzmir, Turkey." In 8th Congress of the Balkan Geophysical Society. Netherlands: EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201414234.

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Mikheeva, A. V., and I. I. Kalinnikov. "Creepex as a parameter of seismo-geodynamic studies based on geo-information systems." In Spatial Data Processing for Monitoring of Natural and Anthropogenic Processes 2021. Crossref, 2021. http://dx.doi.org/10.25743/sdm.2021.18.89.024.

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The GIS-EEDB (the Expert Earthquake Database) and GIS-ENDDB (the Earth’s Natural Disasters DataBase) geoinformation systems implement methods for spatial-temporal analysis of both classical and new characteristics of the seismogeodynamic process. One of the new characteristics is a normalized creepex parameter that can be used in the statistical approach to studying of seismicity to assess a relative contribution of “soft” (creep) and “hard” (explosion) movements to the overall process of focal radiation. In this paper, the following modifications of the creepex parameter are proposed and compared: 1) Cr0 Cr0_world and CrN CrN world as the result of reducing the parameters Cr0 and CrN of each event to the world average values of the creepex, obtained from the polynomial dependence of Cri_world (i = 0, N) on MS_world where Cri_world are calculated based on the world average estimates of Ms_world and mb_world at uniform intervals of the seismic moment (NEIC catalog), 2) Cr_bji as the result of reducing CrN of each event to CrN_bji i.e. to the average for the studied in this work BJI catalog creepex values obtained from the polygonal trend CrN (MS) of all the catalog events. The advantage of using the creepex parameter, reduced to the trend of averaging the magnitudes of the catalog in question, is revealed, since the smallest linear dependence of the creepex on the magnitude is achieved (in comparison with the classical and normalized creepex) and the symmetry in the maximum amplitude of the deviation of the parameter relative to zero is preserved. Examples of the application of the compared parameters in specific seismic-geodynamic studies of aftershock processes of the Molucca and Simushir earthquakes also demonstrate the advantage of the parameter Cr_bji n the observed correspondence of the variations of the latter to the known physical processes in the focal zone of the Kashmir event, studied by the seismic-geodynamic methods of the GIS-EEDB geographical information system.
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Vijay, Rahul Kumar, and Satyasai Jagannath Nanda. "Shared Nearest Neighbor Based Classification of Earthquake Catalogs in Spatio-Temporal Domain." In 2018 Fourth International Conference on Computing Communication Control and Automation (ICCUBEA). IEEE, 2018. http://dx.doi.org/10.1109/iccubea.2018.8697624.

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Ormeni, R., I. Hoxha, O. Gjuzi, R. Bozo, D. Gega, X. Kanani, D. Mucaj, et al. "The Catalogue of Earthquakes Focal Mechanism Occurred in Albania and its Surrounding During 1948 to 2022." In NSG2022 28th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202220159.

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Звіти організацій з теми "Earthquake catalogue"

1

Visser, R., H. Kao, R. M. H. Dokht, A. B. Mahani, and S. Venables. A comprehensive earthquake catalogue for northeastern British Columbia: the northern Montney trend from 2017 to 2020 and the Kiskatinaw Seismic Monitoring and Mitigation Area from 2019 to 2020. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329078.

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Анотація:
To increase our understanding of induced seismicity, we develop and implement methods to enhance seismic monitoring capabilities in northeastern British Columbia (NE BC). We deploy two different machine learning models to identify earthquake phases using waveform data from regional seismic stations and utilize an earthquake database management system to streamline the construction and maintenance of an up-to-date earthquake catalogue. The completion of this study allows for a comprehensive catalogue in NE BC from 2014 to 2020 by building upon our previous 2014-2016 and 2017-2018 catalogues. The bounds of the area where earthquakes were located were between 55.5°N-60.0°N and 119.8°W-123.5°W. The earthquakes in the catalogue were initially detected by machine learning models, then reviewed by an analyst to confirm correct identification, and finally located using the Non-Linear Location (NonLinLoc) algorithm. Two distinct sub-areas within the bounds consider different periods to supplement what was not covered in previously published reports - the Northern Montney Trend (NMT) is covered from 2017 to 2020 while the Kiskatinaw Seismic Monitoring and Mitigation Area (KSMMA) is covered from 2019 to 2020. The two sub-areas are distinguished by the BC Oil &amp; Gas Commission (BCOGC) due to differences in their geographic location and geology. The catalogue was produced by picking arrival phases on continuous seismic waveforms from 51 stations operated by various organizations in the region. A total of 17,908 events passed our quality control criteria and are included in the final catalogue. Comparably, the routine Canadian National Seismograph Network (CNSN) catalogue reports 207 seismic events - all events in the CNSN catalogue are present in our catalogue. Our catalogue benefits from the use of enhanced station coverage and improved methodology. The total number of events in our catalogue in 2017, 2018, 2019, and 2020 were 62, 47, 9579 and 8220, respectively. The first two years correspond to seismicity in the NMT where poor station coverage makes it difficult to detect small magnitude events. The magnitude of completeness within the KSMMA (ML = ~0.7) is significantly smaller than that obtained for the NMT (ML = ~1.4). The new catalogue is released with separate files for origins, arrivals, and magnitudes which can be joined using the unique ID assigned to each event.
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2

Allen, T. I., M. Leonard, H. Ghasemi, and G. Gibson. The 2018 National Seismic Hazard Assessment for Australia – earthquake epicentre catalogue. Geoscience Australia, 2018. http://dx.doi.org/10.11636/record.2018.030.

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Huang, G. D., H. Kao, and Y. J. Gu. A comprehensive earthquake catalogue for southwestern Alberta, between 2004 and 2015. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/321826.

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4

Lamontagne, M. Possible earthquake triggers of submarine landslides in the Estuary of the St. Lawrence River: insights from the earthquake catalogue. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2009. http://dx.doi.org/10.4095/226672.

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Visser, R., B. Smith, H. Kao, A. Babaie Mahani, J. Hutchinson, and J. E. McKay. A comprehensive earthquake catalogue for northeastern British Columbia and western Alberta, 2014-2016. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/306292.

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Hobbs, T. E., J. M. Journeay, and D. Rotheram. An earthquake scenario catalogue for Canada: a guide to using scenario hazard and risk results. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328364.

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Visser, R., H. Kao, B. Smith, C. Goerzen, B. Kontou, R. M. H. Dokht, J. Hutchinson, F. Tan, and A. Babaie Mahani. A comprehensive earthquake catalogue for the Fort St. John-Dawson Creek region, British Columbia, 2017-2018. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326015.

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Farahbod, A. M., H. Kao, and D. Snyder. An earthquake catalogue for seismic events in the Norman Wells region of the central Mackenzie Valley, Northwest Territories, using waveform data from local seismic stations. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328953.

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The development of unconventional hydrocarbon resources in the Norman Wells region of the Central Mackenzie Valley, Northwest Territories, has been explored by the energy industry. In early 2014, Conoco-Philips Canada conducted two multi-stage test operations of hydraulic fracturing (HF) in the region. In this study, we combine seismic data from the Canadian National Seismograph Network, four new stations established by the Northwest Territories Geoscience Office in collaboration with Natural Resources Canada in the Norman Wells region, and a local dense array installed by Conoco-Philips Canada to study the seismicity distribution during the pre-HF, HF and post-HF periods. We have identified and located 130 earthquakes within 100 km of the geographic centre of the local seismic network near Norman Wells for the pre-HF period (11 September 2013 - 7 February 2014). In comparison, 231 events are located during the HF period (8 February 2014 - 10 March 2014), and for the two post-HF periods, 11 March 2014 - 31 July 2014 and 27 February 2015 - 31 December 2015, we have catalogued 255 and 138 events, respectively. Source parameters and detailed phase pickings of each earthquake are given in the Appendices.
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Rutherford, J., and J. F. Cassidy. Comparing felt intensity patterns for crustal earthquakes in the Cascadia and Chilean subduction zones, offshore British Columbia, United States, and Chile. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330475.

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In this study, we utilize US Geological Survey citizen science earthquake felt intensity data to investigate whether , crustal earthquakes in the Chilean Subduction Zone show similar, "felt intensity" distributions to events of the same magnitude and depths within the Cascadia Subduction Zone (Quitoriano &amp; Wald, 2020; USGS Earthquake Hazards Program, 2020). In a companion article (Rutherford &amp; Cassidy, 2022) we examine intraslab deep earthquake intensity patterns for the Chile and Cascadia subduction zones. Building on from the intraslab companion article, the goal of this comparison is to determine whether felt intensity information from several recent large (M8-8.8) subduction earthquakes in Chile can be applied to Cascadia (where no subduction earthquakes have been felt since 1700). This would provide a better understanding of shaking intensity patterns for future subduction earthquakes in Cascadia - critical information for scientists, engineers, and emergency management organizations. For this research, we utilized 20 years of cataloged Did-You-Feel-It (DYFI) citizen science data from the US Geological Survey's (USGS) earthquake online catalog, the ANSS Comprehensive Earthquake Catalog (ComCat) Documentation (USGS Earthquake Hazards Program, 2021). In total, we considered and compared intensity patterns for fourteen magnitudes from 30 earthquakes in Cascadia (ranging from magnitudes 4.5 to 7.2, the highest magnitude event in Cascadia zone) to the intensity patterns from 114 earthquakes in Chile, with the same magnitudes as the Cascadia events (M4.5-M7.2). Our analysis involved plotting and fitting the Chile and Cascadia earthquake DYFI responses to compare the intensity patterns for the two subduction zones. Overall, we find good agreement between felt patterns in Chile and Cascadia. For example, all plots show the expected downward trend for intensity with distance. Even distribution with limited clustering is seen in all fourteen magnitudes, with slight intensity clustering of responses around the 30 to 600 km. This is slightly different from the intraslab pattern which demonstrated a distinct cluster at further distance from the hypocenter, e.g., cluster at 50 to 300 km. These results provide confidence that we can use Chilean intensity data for megathrust earthquakes in Cascadia.
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Ackerley, N., A. L. Bird, M. Kolaj, H. Kao, and M. Lamontagne. Procedures for seismic event type discrimination at the Canadian Hazards Information Service. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329613.

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Within a catalogue of seismic events, it is necessary to distinguish natural tectonic earthquakes from seismic events due to human activity or other natural processes. This becomes very important when the data are incorporated into models of seismic hazard, since natural and anthropogenic events follow different recurrence and scaling laws. This document outlines a two-step procedure whereby first, a most likely event type is identified, and second, confirmation or refutation is sought. The procedure is intended to be compatible with current and past practices at the Canadian Hazards Information Service and the Geological Survey of Canada in assigning event types in the National Earthquake Database (NEDB). Furthermore, this document presents a new nomenclature and coding system for event types and their certainty, one that is compatible with QuakeML. Detailed classification criteria are given for all common event types; for rare event types, only definitions and examples are given.
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