山西地区重力场变化与洪洞M_L5.0地震  

Variation of Gravity Field in Shanxi Region before and a fter Hongtong, Shanxi, Earthquake of M_L 5.0

作　　者：冯建林[1] 李清林[1] 秦建增[1] 

机构地区：[1]中国地震局地球物理勘探中心,河南郑州450002

出　　处：《山西地震》2005年第3期20-23,41,共5页Earthquake Research in Shanxi

摘　　要：选取山西测网内2002年至2004年的重力复测资料,研究了2003年11月25日山西洪洞ML5.0地震前后该区重力场的变化特征,认为重力场变化与洪洞ML5.0地震有较好的对应关系,山西地震带上断陷盆地内的活动断裂蠕动和地壳内部质量迁移等因素的共同作用导致该区重力场发生变化,进而引起了该次地震的发生。Variation feature of gravity field in Shanxi region before and after Hongtong, Shanxi, earthquake of Me5.0 is studied, using re-measuring gravity data, from 2002 to 2004, within Shanxi observation network. It is found that variation of gravity field well correlated with Hongtong, Shanxi, earthquake of ML 5. 0. It is pointed out that variation of gravity field in this region is resulted in creeping motion of active faults within downfaulted basin of Shanxi Seismic Belt and mass transition inside the crust etc. , which lead to this earthquake.

关 键 词：重力场 断层蠕动 质量迁移 洪洞ML5.0地震 

分 类 号：P315.726[天文地球—地震学]