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Effects of the Nepal Ms8.1 earthquake in 2015 on seismic activity in the Qinghai-Tibet Plateau
程国亮
Lanzhou Institute of Seismology,China Earthquake Administration
摘要:
We obtained the displacement and deformation caused by 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-Tibet block. Our primary results suggest southward movement of the Qinghai-Tibet block is caused by a large earthquake occurring on thrust fault in 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.
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Effects of the Nepal Ms8.1 earthquake in 2015 on seismic activity in the Qinghai-Tibet Plateau
CHENG Guoliang
Lanzhou Institute of Seismology,China Earthquake Administration
Abstract:
We obtained the displacement and deformation caused by 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-Tibet block. Our primary results suggest southward movement of the Qinghai-Tibet block is caused by a large earthquake occurring on thrust fault in 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