科研之友
微信
新浪微博
Facebook
分享链接
摘要
Deep processes of the M(s)8.1 earthquake on April 25, 2015 located in Pokhara, Nepal is closely related to Himalayan seismically active area which is the middle part of "Mediterranean Himalaya-South Asia seismic zone". This huge event is the result of long-term tectonic activity and accumulation of stresses in this intense activity area which is due to the strong deep material movement and severe energy exchange. Our comprehensive analysis and study suggest that (1) The generation, occurrence and development of this great earthquake has a frequently seismic activity background both in its locality and adjacent regions; There have been several megaseisms (M-s >= 8.0) in 500 years from 1505 to 2015. (2) The specific geophysical boundary conditions and deep dynamic processes in this area show deep material redifferentiation and energy exchange. (3) The occurrence of the megaseism is related to peculiar stress distribution of the surrounding areas, special crust-mantle structure, differentiation of media attributes and rupture responses, as well as properties of fault plane solutions. (4) There are still some aspects which need to deepen understandings including three north-trending faults with different angles towards to depth in the Himalaya, the hypocentral locations and shallow surface deformation features. (5) The M(s)8.1 earthquake has strong influences on the wave field of its adjacent regions, so we should strengthen the observation and detection of geophysical fields to capture the generation and occurrence of possible great earthquakes in the future.
- 出版日期2017-1
- 单位中国地震台网中心; 中国科学院地质与地球物理研究所兰州油气资源研究中心; 中国地震局; 中国科学院地质与地球物理研究所; 中国科学院大学
