Title: Seismic hazard analysis of North East India and hazard assessment of capital cities in the region

Authors: Aman Kumar; Satyaprakash Mishra; Arjun Sil

Addresses: Department of Civil Engineering, National Institute of Technology Silchar, Silchar, Assam, India ' Department of Civil Engineering, National Institute of Technology Silchar, Silchar, Assam, India ' Department of Civil Engineering, National Institute of Technology Silchar, Silchar, Assam, India

Abstract: Seismic hazard analysis is an important method for analysing the possible danger of earthquakes in a specific location. North-Eastern India experiences strong seismic activity due to its position near the meeting point of the Indian and Eurasian tectonic plates. In this research, a seismic hazard analysis has been performed for the capital headquarters of the North-Eastern region of India by considering updated seismicity and best-fitted ground motion equation. For this, the earthquake catalogue from 1762 to 2020 has been taken into account; after the declustering of earthquake data, fault zones are identified based on the earthquake density along the fault, and parameters (a & b) for each fault zone are then derived using the Gutenberg-Richter (G-R) relationship. The results of the seismic hazard analysis are presented for the capital headquarters (HQ) of each state in North East India as controlling sources, seismic hazard curves and uniform hazard spectra. The Ground Motion Value has been observed to vary from 0.26 to 0.80 g in the PSHA approach and 0.43 to 0.90 g in the DSHA method for North East India. The study results can be used to develop disaster management policies and strengthen the region's infrastructure and seismic-resistant populations.

Keywords: seismicity parameter; earthquake; GMPE; ground motion prediction equation; PGA; peak ground acceleration; spectral acceleration.

DOI: 10.1504/IJRS.2023.134299

International Journal of Reliability and Safety, 2023 Vol.17 No.2, pp.143 - 166

Received: 19 Nov 2022
Accepted: 15 Jun 2023
Published online: 17 Oct 2023 *

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