The Influence of Surface Topography on the Weak Ground Shaking in Kathmandu Valley during the 2015 Gorkha Earthquake, Nepal

被引：5

作者：

van der Meijde, Mark ^{[1
]}

Ashrafuzzaman, Md ^{[1
,2
]}

Kerle, Norman ^{[1
]}

Khan, Saad ^{[1
,3
]}

van der Werff, Harald ^{[1
]}

机构：

[1] Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, Dept Earth Syst Anal, NL-7500 AE Enschede, Netherlands

[2] Govt Peoples Republ Bangladesh, Rd & Highways Dept, Dhaka 1208, Bangladesh

[3] Bacha Khan Univ Charsadda, Dept Geol, Charsadda 24420, Pakistan

来源：

SENSORS | 2020年 / 20卷 / 03期

关键词：

earthquake; Nepal; amplification; modelling; digital elevation model; W; 7.8; GORKHA; SEISMIC-WAVE PROPAGATION; SPECTRAL-ELEMENT; MOTION; SIMULATION; MODEL; BASIN;

D O I：

10.3390/s20030678

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

It remains elusive why there was only weak and limited ground shaking in Kathmandu valley during the 25 April 2015 Mw 7.8 Gorkha, Nepal, earthquake. Our spectral element numerical simulations show that, during this earthquake, surface topography restricted the propagation of seismic energy into the valley. The mountains diverted the incoming seismic wave mostly to the eastern and western margins of the valley. As a result, we find de-amplification of peak ground displacement in most of the valley interior. Modeling of alternative earthquake scenarios of the same magnitude occurring at different locations shows that these will affect the Kathmandu valley much more strongly, up to 2-3 times more, than the 2015 Gorkha earthquake did. This indicates that surface topography contributed to the reduced seismic shaking for this specific earthquake and lessened the earthquake impact within the valley.

引用

页数：12

共 42 条

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