【摘要】 利用安徽皖北流动重力监测网2005—2007年的流动重力观测资料,分析了安徽定远ML4.7地震前后皖北区域重力场的动态变化特征。研究结果表明:地震发生在重力负值变化(高值区附近的重力变化)高梯度带上;震前震中附近重力场发生明显减弱,并沿断裂产生重力变化高梯度带;震后重力场呈松驰反向恢复;重力场的动态变化清晰地反映出震源应力场引起的重力源兆变化特征。更多还原

【Abstract】 By use of mobile gravity data in the northern area of Anhui province during 2005-2007,the dynamical gravity variation features before and after Dingyuan ML4.7 earthquake are analyzed.The results show that Dingyuan earthquake occurred in the high gradient zone of gravity variation near the area with high negative gravity variation.Before the earthquake,the gravity values around epicenter decreased,at the same time the high gravity gradient belt came into being along active faults;after the earthquake,the gravity field takes on relax and resumption.The dynamic gravity variations clearly reflect the features of source precursor caused by stress field of seismic focus.更多还原