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Seismic hazard assessment of the Shillong Plateau using a probabilistic approach

Baro, Olympa; Kumar, Abhishek; Ismail-Zadeh, Alik

Seismotectonic processes of the Shillong Plateau (SP) have been influenced by the Himalayan orogeny, the India-Burmese subduction, and the Bengal Basin evolution leading to high seismic activity in the region. With a goal of assessing seismic hazards in the SP and providing a scientific information to engineering and disaster risk management communities, a probabilistic seismic hazard analysis is employed to determine hazard in highly-populated districts of SP and particularly in Shillong, Nongpoh, and Tura cities, located within the districts. This analysis is based on the use of historical and instrumentally recorded regional earthquakes since 1411 and deals with uncertainties related to earthquake magnitudes, rupture locations, and the frequency of ground motion exceedance. Individual hazard curves indicate that the Barapani fault possesses the highest frequency of seismic hazard for Shillong city and Nongpoh, and the Eocene hinge zone and Dauki faults are responsible for the highest frequency of seismic hazard at Tura. The results of the hazard assessment together with those obtained earlier using a scenario-based approach demonstrate that although the Oldham fault located near Tura can produce a great, but rare earthquake, few other nearby faults are capable of producing smaller magnitude events with a higher probability of occurrence.

Verlagsausgabe §
DOI: 10.5445/IR/1000125268
Veröffentlicht am 28.01.2021
DOI: 10.1080/19475705.2020.1833989
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1947-5705, 1947-5713
KITopen-ID: 1000125268
Erschienen in Geomatics, natural hazards and risk
Verlag Tayler & Francis
Band 11
Heft 1
Seiten 2210–2238
Vorab online veröffentlicht am 22.10.2020
Schlagwörter Seismic hazard, probabilistic analysis, Shillong Plateau, seismicity, seismotectonics
Nachgewiesen in Scopus
Web of Science
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