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Effects of the Nepal MS8.1 Earthquake in 2015 on Seismic Activity in the Qinghai-Tibetan Plateau
CHENG Guoliang, ZHANG Yuansheng, WEI Congxin
Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
摘要:
We obtained the displacement and deformation caused by the 2015 Nepal MS8.1 earthquake adopting the finite element method, and analyzed the displacement and deformation characteristics and effect of three large earthquakes on seismic activity in the Qinghai-Tibetan block. Our primary results suggest southward movement of the Qinghai-Tibetan block is caused by a large earthquake occurring on thrust fault in the Himalayan zone, the displacement direction is reverse to the background displacement. The occurrence of these large earthquakes will result in stress unloading and earthquake activity will be weakened in stress unloading areas. Through the simulation results, we can detect the distribution area of stress loading and unloading caused by large earthquakes. Simultaneously, it provides a fundamental evidence for determination of earthquake activity trend.
关键词:  Nepal MS8.1 earthquake  Stress loading and unloading  Earthquake quiescence  Seismogenic region forecast
DOI:10.19743/j.cnki.0891-4176.201903001
分类号:
基金项目:This project is sponsored by the Science for Earthquake Resilience (XH17039) and the National Social Science Foundation of China (41574044).
Effects of the Nepal MS8.1 Earthquake in 2015 on Seismic Activity in the Qinghai-Tibetan Plateau
CHENG Guoliang, ZHANG Yuansheng, WEI Congxin
Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
Abstract:
We obtained the displacement and deformation caused by the 2015 Nepal MS8.1 earthquake adopting the finite element method, and analyzed the displacement and deformation characteristics and effect of three large earthquakes on seismic activity in the Qinghai-Tibetan block. Our primary results suggest southward movement of the Qinghai-Tibetan block is caused by a large earthquake occurring on thrust fault in the Himalayan zone, the displacement direction is reverse to the background displacement. The occurrence of these large earthquakes will result in stress unloading and earthquake activity will be weakened in stress unloading areas. Through the simulation results, we can detect the distribution area of stress loading and unloading caused by large earthquakes. Simultaneously, it provides a fundamental evidence for determination of earthquake activity trend.
Key words:  Nepal MS8.1 earthquake  Stress loading and unloading  Earthquake quiescence  Seismogenic region forecast