Rupture process of the Mw=7.9 2015 Gorkha earthquake (Nepal): Insights into Himalayan megathrust segmentation
Rupture process of the Mw=7.9 2015 Gorkha earthquake (Nepal): Insights into Himalayan megathrust segmentation
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DOI：
10.1002/2015gl066044
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发表时间：
2015-10-28
影响因子：
5.2
通讯作者：
Bollinger, Laurent
中科院分区：
文献类型：
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作者：
Grandin, Raphael;Vallee, Martin;Bollinger, Laurent
我们研究了2015年4月25日Gorkha地震（M-w = 7.9）的破裂过程，使用地震波，强震数据，高速率GPS，静态GPS和合成孔径雷达（SAR）数据的运动学联合反演。反演结果和补充的反投影分析都表明，主滑动斑以3.1-3.3km/s的稳定速度单侧破裂。该特征可能有助于在加德满都观察到的中等峰值地面加速度（0.2 g）。类似于15公里的深断裂沿着喜马拉雅主冲断层耦合部分的底部发生，并且没有破坏从加德满都到前部的区域。断裂长度和宽度的限制不能确定在震前震间耦合分布，因此讨论了光的结构体系的巨型逆冲断层。
We investigate the rupture process of the 25 April 2015 Gorkha earthquake (M-w = 7.9) using a kinematic joint inversion of teleseismic waves, strong motion data, high-rate GPS, static GPS, and synthetic aperture radar (SAR) data. The rupture is found to be simple in terms of coseismic slip and even more in terms of rupture velocity, as both inversion results and a complementing back projection analysis show that the main slip patch broke unilaterally at a steady velocity of 3.1-3.3km/s. This feature likely contributes to the moderate peak ground acceleration (0.2 g) observed in Kathmandu. The similar to 15km deep rupture occurs along the base of the coupled portion of the Main Himalayan Thrust and does not break the area ranging from Kathmandu to the front. The limitation in length and width of the rupture cannot be identified in the preearthquake interseismic coupling distribution and is therefore discussed in light of the structural architecture of the megathrust.