Rupture imaging of the 25 April 2015 MW7.9 Nepal earthquake from back-projection of teleseismic P waves
Rupture imaging of the 25 April 2015 MW7.9 Nepal earthquake from back-projection of teleseismic P waves
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2015 年 4 月 25 日尼泊尔 MW7.9 地震的远震 P 波反投影破裂成像
DOI：
10.29382/eqs-2018-0199-3
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
刘巧霞
中科院分区：
文献类型：
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作者：
邱勇;刘巧霞
2015年4月25日发生的尼泊尔7.9级地震是自1934年比哈尔邦-尼泊尔地震以来尼泊尔发生的破坏性最大的地震，造成8500多人死亡。三个子台的反投影图像显示，尼泊尔地震沿走向向东南方向沿着传播，传播距离约为160-170 km，持续时间约为50-55 s。破裂过程是一个简单的单边事件，破裂速度约为3.3 km/s，束流功率主要分布在加德满都以北的地理区域，源时间函数曲线的峰值强度出现在30 s左右。地震具有破坏性，因为它发生在浅深度（~ 12-15公里）和事实上，首都位于软沉积盆地。此外，发生在加德满都山谷的较长周期波的共振效应导致破坏性加剧，主要影响较高的建筑物。
The MW7.9 Nepal earthquake of 25 April 2015 had over 8, 500 fatalities and was the most destructive earthquake in Nepal since the Bihar-Nepal earthquake in 1934.In this study, we imaged the rupture process of this Nepal event by back-projecting the teleseismic P-wave energy recorded at the three regional networks in Alaska, Australia and Europe. The back-projection images of the three subarrays revealed that the Nepal earthquake propagated along the strike in a southeast direction over a distance of ~ 160–170 km with the duration of ~ 50–55 s. The rupture process was found to be a simple,.unilateral event with a near constant velocity of 3.3 km/s.The beam power was mainly distributed in the geographic region just north of Kathmandu and the peak intensity for the source time function curve occurred at about 30 s. The earthquake was destructive due to its occurrence at shallow depth (~ 12–15 km) and the fact that the capital lies in a basin of soft sediment. Additionally, the resonance effect for the longer period waves that occurred in the Kathmandu valley led to destructive aggravation, impacting mainly the taller buildings.