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Regional Rupture-Based Seismic Hazard Analysis of Tripura State—NE India

Anbazhagan, P and Das, A and Silas, AG (2023) Regional Rupture-Based Seismic Hazard Analysis of Tripura State—NE India. In: Indian Geotechnical Conference, IGC 2021, 16 - 18 December 2021, Trichy, pp. 293-310.

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Official URL: https://doi.org/10.1007/978-981-19-6998-0_26


Seismic hazard analysis is the quantitative estimation of hazards caused by ground shaking at a particular site. Tripura is considered as one of the most seismically active states in India with complex seismotectonic. At the same time, detailed seismic hazard analyses with regional parameters are very less studied. So, the present study focused on estimating the deterministic seismic hazard analysis (DSHA) for Tripura considering the regional rupture characteristics and conventional approach. Seismic study area (SSA), based on regional past earthquake damages, was arrived as 700 km for the study area Tripura. A seismotectonic map was prepared for the 700 km SSA by compiling the seismic event and seismic source. Declustering of the earthquake data was done to remove the foreshocks and aftershocks, and statistical analysis was carried out for data completeness. Tripura was divided into three major seismogenic zones on the basis of seismicity and tectonic features. Seismicity parameters (a and b) were calculated using Gutenberg–Richter (G-R) relationship. All the probable seismic sources like faults, lineaments, and gaps in the study area were identified from the seismotectonic atlas (SEISAT 2000) published by Geological Survey of India (GSI) and also from the literatures available. Digitization and georeferencing of the tectonic maps were done to prepare the fault map. Using predictive ground motion equations applicable for the SSA, DSHA was carried out. The effect of the regional rupture characteristics on the seismic hazard analysis was studied by comparing the results from conventional and rupture-based hazard analysis. The maximum median Peak Ground Acceleration (PGA) values estimated in Tripura state using the rupture-based and conventional approaches were 0.50 g and 0.43 g, respectively. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

Item Type: Conference Paper
Publication: Lecture Notes in Civil Engineering
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright of this article belongs to Springer Science and Business Media Deutschland GmbH.
Keywords: Acceleration; Earthquake effects; Faulting; Hazards; Motion estimation; Seismic response, Deterministic seismic hazard analysis; Ground motion prediction; Ground motion prediction equation; Peak ground acceleration; Prediction equations; Regional rupture characteristic; Seismic hazard analysis; Seismic studies; Seismotectonics; Study areas, Equations of motion
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 14 Mar 2023 09:07
Last Modified: 14 Mar 2023 09:07
URI: https://eprints.iisc.ac.in/id/eprint/81007

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