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

被引:2
|
作者
Hao, Hongtao [1 ,2 ]
Xing, Lelin [1 ,2 ]
Liu, Ziwei [1 ,2 ]
Han, Yufei [3 ]
Li, Hui [1 ,2 ]
机构
[1] China Earthquake Adm, Key Lab Earthquake Geodesy, Inst Seismol, Wuhan 430071, Peoples R China
[2] China Earthquake Adm, Wuhan Base Inst Crustal Dynam, Wuhan 430071, Peoples R China
[3] Natl Earthquake Infrastruct Serv, Beijing 100045, Peoples R China
基金
中国国家自然科学基金;
关键词
Continental Tectonics Environmental Monitoring Network of China; Nepal Ms8.1 earthquake; Gravity variation; Crustal deformation;
D O I
10.1016/j.geog.2016.07.009
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
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 correlation 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 variation. 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. (C) 2016, Institute of Seismology, China Earthquake Administration, etc. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
引用
收藏
页码:425 / 431
页数:7
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