摘要
系统深入地分析了2005～2009年华北地区流动重力观测资料,提取2006年河北省文安县MS5.1地震前后0.5a、1a等不同时间尺度可靠的重力场动态变化信息,研究其与地震活动的关系。结果显示:文安地震孕育阶段,测区出现较大范围的区域性重力异常,并产生与地震孕育有关的局部重力异常区及重力变化高梯度带。重力场动态图像较清晰地反映了区域重力场的有序性演化与地震活动。
Analyzing the mobile gravity observational data in North China from 2005 and 2009 systematically and deeply, we derived dynamic variation of the regional gravity field in different time scales before and after Wen＇an Ms5.1 earthquake, and studied the relationship between gravity anomaly variation and seismic activi- ty. The result showed that there existed regional gravity anomaly in a wide range in the survey area during the preparation of Wen＇an Ms5.1 earthquake, and there were local gravity anomaly area and high gradient zone of gravity variation referential to the earthquake preparation. The dynamic image of gravity field clearly reflected the evolution orderly and seismic activity of regional gravity field.
出处
《地震研究》
CSCD
北大核心
2012年第3期318-322,441,共5页
Journal of Seismological Research
基金
地震行业科研重点专项"多种地球物理场动态图像与强震预测试验"(201008007)资助
关键词
文安5.1级地震
流动重力观测
重力变化
重力场
Wen＇an M5.1 earthquake
mobile gravity observation
gravity variation
gravity field
