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 earthq...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 QinghaiTibetan 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.展开更多
After the 2015 M_S8. 1 Nepal earthquake,a strong and moderate seismicity belt has formed in Tibet gradually spreading along the northeast direction. In this paper,we attempt to summarize the features and investigate t...After the 2015 M_S8. 1 Nepal earthquake,a strong and moderate seismicity belt has formed in Tibet gradually spreading along the northeast direction. In this paper,we attempt to summarize the features and investigate the primary mechanism of this behavior of seismic activity,using a 2-D finite element numerical model with tectonic dynamic settings and GPS horizontal displacements as the constraints. In addition,compared with the NEtrending seismicity belt triggered by the 1996 Xiatongmoin earthquake,we discuss the future earthquake hazard in and around Tibet. Our results show that: the NE-directed seismicity belt is the response of enhanced loading on the anisotropic Qinghai-Tibetan plateau from the Indian plate and earthquake thrusting. Also,this possibly implies that a forthcoming strong earthquake may fill in the gaps in the NE-directed seismicity belt or enhance the seismic hazard in the eastern( the north-south seismic zone) and western( Tianshan tectonic region) parts near the NE-directed belt.展开更多
基金sponsored by the Science for Earthquake Resilience(XH17039)the National Social Science Foundation of China(41574044)
文摘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 QinghaiTibetan 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.
基金funded by China Comprehensive Geophysical Field Observation in North China of Earthquake Scientific Research(201508009)
文摘After the 2015 M_S8. 1 Nepal earthquake,a strong and moderate seismicity belt has formed in Tibet gradually spreading along the northeast direction. In this paper,we attempt to summarize the features and investigate the primary mechanism of this behavior of seismic activity,using a 2-D finite element numerical model with tectonic dynamic settings and GPS horizontal displacements as the constraints. In addition,compared with the NEtrending seismicity belt triggered by the 1996 Xiatongmoin earthquake,we discuss the future earthquake hazard in and around Tibet. Our results show that: the NE-directed seismicity belt is the response of enhanced loading on the anisotropic Qinghai-Tibetan plateau from the Indian plate and earthquake thrusting. Also,this possibly implies that a forthcoming strong earthquake may fill in the gaps in the NE-directed seismicity belt or enhance the seismic hazard in the eastern( the north-south seismic zone) and western( Tianshan tectonic region) parts near the NE-directed belt.
