3D simulation of ground motion for the 2015 Mw 7.8 Gorkha earthquake, Nepal, based on the spectral element method

Wenhao Shen, Dinghui Yang, Xiwei Xu, Shuxin Yang and Shaolin Liu ()
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Wenhao Shen: Ministry of Emergency Management
Dinghui Yang: Tsinghua University
Xiwei Xu: Ministry of Emergency Management
Shuxin Yang: Ministry of Emergency Management
Shaolin Liu: Ministry of Emergency Management

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 112, issue 3, No 40, 2853-2871

Abstract: Abstract The 2015 Mw7.8 Gorkha earthquake is the latest strong event with magnitude greater than Mw7.5 in the Himalayas. The occurrence of this event provides a good opportunity to better understand the characteristics of ground motion produced by a low dip thrust fault. In this study, we constructed a kinematic source model and established a numerical model that incorporates realistic surface topography, velocity structure and the Kathmandu basin for the Gorkha event. Based on the source and structure models, ground motions in the periods of 2–20 s were simulated by a spectral element method. Our results are as follow. (1) Ground motions show prominent directivity along strike. (2) The basin effect can amplify the amplitude of ground motion in Kathmandu especially on the horizontal component. (3) Horizontal ground motions in Kathmandu valley exhibit obvious amplification in the frequency range of 0.2–0.4 Hz, which is absent in vertical component. The results of this work are of importance for future studies on assessing seismic hazard in the Himalayas.

Keywords: Gorkha earthquake; Ground motion; Numerical simulation; Spectral element method; Seismic hazard (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05291-1

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