Hits:

Indexed by:期刊论文

Date of Publication:2013-12-01

Journal:EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION

Included Journals:SCIE、CSCD、Scopus

Volume:12

Issue:4

Page Number:577-586

ISSN No.:1671-3664

Key Words:seismic hazard assessment; peak ground acceleration; earthquake; Nepal Himalaya

Abstract:The seismic ground motion hazard for Nepal has been estimated using a probabilistic approach. A catalogue of earthquakes has been compiled for Nepal and the surrounding region (latitude 26A degrees N and 31.7A degrees N and longitude 79A degrees E and 90A degrees E) from 1255 to 2011. The distribution of catalogued earthquakes, together with available geological and tectonic information were used to delineate twenty-three seismic source zones in Nepal and the surrounding region. By using the seismic source information and probabilistic earthquake hazard parameters in conjunction with a selected ground motion prediction relationship, peak ground accelerations (PGAs) have been calculated at bedrock level with 63%, 10%, and 2% probability of exceedance in 50 years. The estimated PGA values are in the range of 0.07-0.16 g, 0.21-0.62 g, and 0.38-1.1 g for 63%, 10%, and 2% probability of exceedance in 50 years, respectively. The resulting ground motion maps show different characteristics of PGA distribution, i.e., high hazard in the far-western and eastern sections, and low hazard in southern Nepal. The quantified PGA values at bedrock level provide information for microzonation studies in different parts of the country.