摘要
利用国家重大科学工程"中国地壳运动观测网络"1998—2008年绝对重力和相对重力的观测资料,获得了南北地震带地区的重力场及其动态变化,从动态的观点研究了2008年5月12日汶川8.0级地震前后区域重力场演化特征及其与地震活动的关系.重力场变化既具有时-空分布的不均匀性,同时又具有与活动断裂构造密切相关和与地震孕育发展有着内在联系.重力场动态变化图象较清晰地反映了汶川大地震孕育、发生过程中出现的重力前兆信息.
Based on the data of absolute and relative gravity observations of the national major scientific project China Crustal Movement Observation Network from 1998 to 2008,gravity field in the North-South seismic belt region and its dynamic variations are obtained. The evolution characteristics of regional gravity field and its relationship with the seismic activity before and after the 12 May 2008 Wenchuan MS8.0 earthquake are studied in the sight of dynamics. The dynamic variation image of gravity field reflect the portentous information of the development and occurrence of Wenchuan MS8.0 earthquake more clearly. The variations of gravity field show spatial and temporal inhomogeneity,at the same time,however,they reveal certain relation associated with the development and occurrence of the earthquake,and associated also with regional tectonic activity.
出处
《地震学报》
CSCD
北大核心
2010年第6期633-640,共8页
Acta Seismologica Sinica
基金
中国地震局<中国大陆7
8级地震中长期危险性预测研究>(M7专项)
国家自然科学基金(40874035)
地震行业科研重点专项(200908029)资助
关键词
汶川地震
重力变化
动态过程
地震前兆
地震预测
Wenchuan earthquake； gravity change； dynamic process； precursor； prediction；
