2019年甘肃夏河MS5.7地震前后重力场异常特征分析

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地震的孕育发生过程伴随着构造运动、物质迁移和密度变化,将引起地球重力场变化,流动重力重复观测有可能捕捉到与地震孕育有关的前兆信息,从而为中短期地震预测提供重要依据。基于南北地震带2017—2020年的流动重力观测资料,获得了甘东南地区的区域重力场时空变化图像,分析了区域重力场动态变化及其与2019年甘肃夏河M_S5.7地震发生的关系。结果表明:(1)震前测区重力异常变化等值线与临潭—宕昌断裂走向基本一致,且在震中附近出现四象限分布特征,夏河M_S5.7地震发生在重力高梯度带和四象限中心附近;(2)地
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