Surge of Mangla reservoir loading promoted failure on active Decollement of western Himalayas
Surge of Mangla reservoir loading promoted failure on active Decollement of western Himalayas
复制标题
芒拉水库负荷激增促进喜马拉雅山西部活动滑脱破坏
DOI：
10.1016/j.jag.2021.102401
复制
发表时间：
2021
影响因子：
7.5
通讯作者：
Ding Xiaoli
中科院分区：
文献类型：
--
作者：
Xie Lei;Xu Wenbin;Liu Xiaoge;Ding Xiaoli
The extreme rainfall weather during the Indian monsoon season has increased in recent decades changing the hydrological mass distribution that may be responsible for triggering regional earthquakes. In the western Himalayas, a shallow Mw5.7 earthquake took place right after the withdrawal of the 2019 unusual Indian summer monsoon resulting in a rapid increase of ~4.5 km3of water storage at the nearby Mangla reservoir within three months. Through a joint inversion of space geodetic and teleseismic data, we found that the mainshock occurred on the décollement structure of the Main Himalayan Thrust in the western Himalayas, which was previously underdetermined. The significant water loading, and pore pressure diffusion led to Coulomb stress increases of ~10 kPa on the maximum coseismic slip zone promoting fault failure. Our findings demonstrate that climate change could influence certain reservoir-associated earthquakes in the Himalayas. We provide recommendations to improve the regulations for the reservoir operations in Mangla and probably other contexts with similar tectonic settings in the Himalayas during the monsoon season.
