A Review on Probabilistic Seismic Hazard Analysis of Upper Himalayas Region Using Moment Releases Constraint Method

Dheerendra Kumar Singh
Post Graduate, Department of Civil Engineering, Shri Ramswaroop Memorial University , IN

Pramod Kumar Gupta
Post Graduate, Department of Civil Engineering, Shri Ramswaroop Memorial University , IN

Rishabh Joshi
Post Graduate, Department of Civil Engineering, Shri Ramswaroop Memorial University , IN

Keywords: Upper Himalayas, earthquake, recurrence relationship, peak ground acceleration, annual occurrence rate.

Abstract

The Upper Himalayas Region is located in most seismic active zone of Himalayan that exhibits many moderate to large size earthquake. In this study eleven seismic zones are identify in and around of Upper Himalayas Region and the entire area has been divided into 0.2°×0.2° grid size, and the hazard level has been assessed for each grid by considering the seismicity within a 350-km radius around the grid. Using the past earthquake data the seismicity for the area around each grid has been estimated by defining a and b value of the Gutenberg-Richter recurrence relationship and annual occurrence rate has been estimated by constant seismicity and seismic moment release constraints method. Uniform hazard contours for peak ground acceleration as the hazard parameter have been obtained for an exposure time of 50 years and for 90% and 98% confidence level at 0.01s natural periods using constant seismicity and moment release constraint. The trends reflected by these contours are broadly consistent with the major seismotectonic features in the region.

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