Gravity variation in the Tibet area before the Nepal Ms8.1 earthquake

作     者：Hongtao Hao Lelin Xing Ziwei Liu YUfei Han Hui Li 

作者机构：Key Laboratory of Earthquake GeodesyInstitute of SeismologyChina Earthquake AdministrationWuhan430071China Wuhan Base of Institute of Crustal DynamicsChina Earthquake AdministrationWuhan430071China National Earthquake Infrastructure ServiceBeijing100045China 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2016年第7卷第6期

页      面：425-431页

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the Director Foundation of Institute of Seismology,China Earthquake Administration(IS201326121) the National Natural Science Foundation of China(41304059) the special earthquake research grant offered by the China Earthquake Administration(201508009,201308009) 

主　　题：Continental Tectonics Environ mental Monitoring Network ofChinaNepal Ms8.1 earthquakeGravity variationCrustal deformation 

摘      要：This research utilized two periods of gravity monitoring results from 2010 to 2013 from the Continental Tectonics Environmental Monitoring Network of China, analyzed the corre- lation between gravity variation in the Tibet area and the Nepal Ms8.1 earthquake, and investigated the gravity variation mechanism in combination with the crust vertical movement and horizontal strain field observed by Global Positioning System （GPS）. The research results indicated that （1） the gravity variation exhibited apparent characteristics of a positive anomaly and high gradient zone in the Himalayan frontier. This observation is consistent with the existing recognition of the gravity anomaly and occurrence regularity of a strong earthquake; （2） the gravity variation exhibited apparent consistence with the spacious distribution of the vertical movement and the horizontal deformation field in that area. The crustal vertical movement was not the direct cause leading to the gravity vari- ation. It is assumed that the crust stress-strain accumulation in the Qinghai-Tibetan Plateau and its adjacent areas is the important factor that resulted in the variation of gravity.