Seismic hazard assessment of the Shillong Plateau using a probabilistic approach
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2020-01-01
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| Series: | Geomatics, Natural Hazards & Risk |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/19475705.2020.1833989 |
| _version_ | 1831691736788762624 |
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| author | Olympa Baro Abhishek Kumar Alik Ismail-Zadeh |
| author_facet | Olympa Baro Abhishek Kumar Alik Ismail-Zadeh |
| author_sort | Olympa Baro |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-20T11:36:05Z |
| format | Article |
| id | doaj.art-b7a46b94b50848f4b81940a777595385 |
| institution | Directory Open Access Journal |
| issn | 1947-5705 1947-5713 |
| language | English |
| last_indexed | 2024-12-20T11:36:05Z |
| publishDate | 2020-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Geomatics, Natural Hazards & Risk |
| spelling | doaj.art-b7a46b94b50848f4b81940a7775953852022-12-21T19:42:07ZengTaylor & Francis GroupGeomatics, Natural Hazards & Risk1947-57051947-57132020-01-011112210223810.1080/19475705.2020.18339891833989Seismic hazard assessment of the Shillong Plateau using a probabilistic approachOlympa Baro0Abhishek Kumar1Alik Ismail-Zadeh2Civil Engineering, National Institute of TechnologyDepartment of Civil Engineering, Indian Institute of TechnologyInstitute of Applied Geosciences, Karlsruhe Institute of TechnologySeismotectonic 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.http://dx.doi.org/10.1080/19475705.2020.1833989seismic hazardprobabilistic analysisshillong plateauseismicityseismotectonics |
| spellingShingle | Olympa Baro Abhishek Kumar Alik Ismail-Zadeh Seismic hazard assessment of the Shillong Plateau using a probabilistic approach Geomatics, Natural Hazards & Risk seismic hazard probabilistic analysis shillong plateau seismicity seismotectonics |
| title | Seismic hazard assessment of the Shillong Plateau using a probabilistic approach |
| title_full | Seismic hazard assessment of the Shillong Plateau using a probabilistic approach |
| title_fullStr | Seismic hazard assessment of the Shillong Plateau using a probabilistic approach |
| title_full_unstemmed | Seismic hazard assessment of the Shillong Plateau using a probabilistic approach |
| title_short | Seismic hazard assessment of the Shillong Plateau using a probabilistic approach |
| title_sort | seismic hazard assessment of the shillong plateau using a probabilistic approach |
| topic | seismic hazard probabilistic analysis shillong plateau seismicity seismotectonics |
| url | http://dx.doi.org/10.1080/19475705.2020.1833989 |
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