唐山老震区中强地震流动重力异常研究

摘要

选取唐山老震区1992-2014年的流动重力,绘制重力场测值空间变化等值线和时序变化曲线,结合唐山地区4次M≥5.0地震进行异常分析.发现震前有如下特征:(1)流动重力观测资料均有较为明显的前兆异常反应;(2)地震均发生在重力变化的"0"等值线附近.%Selected th Tangshan old seismic region in 1992-2014 flowinge gravity,drawing contour spatial variation of gravity field measurements and temporal variation curve,combining the Tangshan region 4 times 5.0 earthquake anomaly analysis.It is concluded that anomaly before the earthquake showed the following characteristics:(1)flowing gravity observation data are relatively obvious precursory anomaly response;(2)Earthquake occurred close to the contours of the gravity changes.