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Deterministic Seismic Hazard Analysis of Central Gujarat Region

  • Payal Mehta
  • Tejas P. Thaker
  • H. B. Raghvendra
Conference paper

Abstract

The microzonation study of a particular region can be carried out by Deterministic Seismic Hazard Analysis (DSHA) approach. Gujarat is situated in a stable continental region of India which has experienced two severe destructive earthquakes in Kutch 1819 (Mw 7.8) and Bhuj 2001 (Mw 7.7) and seven earthquakes of magnitude Mw ≥ 6.0 during past two centuries. In the present paper, earthquake catalogue and seismotectonic model for the Central Gujarat region have been developed considering 350 km radius around Vadodara city as a centre covering the latitude 18° N to 26° N and longitude 68° E to 77° E. The seismic data has been compiled for past approximately 350 years covering a span of 1668 to 2017 from the various agencies and published literatures. Homogenization of earthquake catalogue has been carried out considering appropriate conversion relationships, which is further validated through the recorded earthquake data. All magnitudes have been converted into equal magnitude i.e. moment magnitude Mw. Declustering of the catalogue has been carried out using various methods like Gardner and Knopoff (1974), Uhrhammer (1986) to remove the foreshocks and aftershocks events. The tectonic details have been collected and compiled from various published literatures and other sources on common platform using Geographical Information System (GIS). Seismotectonic model for Central Gujarat has been developed from the final catalogue. Further, peak ground acceleration values at rock level have been determined considering DSHA approach for Central Gujarat region which varies from 0.167 g to 0.355 g and compared with standard code of practice.

Keywords

Earthquake catalogue Central Gujarat Seismotectonic model Deterministic Seismic Hazard Analysis 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Payal Mehta
    • 1
  • Tejas P. Thaker
    • 1
  • H. B. Raghvendra
    • 1
  1. 1.School of TechnologyPandit Deendayal Petroleum UniversityRaisan, GandhinagarIndia

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