利用山西地区的流动重力观测资料，分析2009年和2016年原平2次地震不同时间尺度的重力场演变特征。结果表明：1）0.5 a尺度重力场变化图像较好地反映了这2次地震震前变化较小→反向变化→在重力变化高梯度带零等值线附近发震→震后调整的演化过程；2）不同时间尺度重力场均显示，地震发生在重力变化梯度带零等值线附近，地震前重力变化量约为40～50 μGal。"/>
Based on the mobile gravity monitoring data of Shanxi region, we analyze multiple time-scale gravity time-variances caused by two Yuanping earthquakes(2009 and 2016). The results indicate that the evolution process of the gravity field variation(0.5 a time scale) of these two earthquakes is“minor change before earthquake → reverse change → earthquake occurred near zero isoline and high-gradient belts →post-earthquake adjustment.” Multiple time-scale gravity field variations show that the earthquakes occurred near 0 isoline and the magnitude of gravity change before the earthquakes is approximately 40 to 50 μGal."/>
Variation Characteristics of Ground Gravity during the Yuanping Earthquake
Abstract Based on the mobile gravity monitoring data of Shanxi region, we analyze multiple time-scale gravity time-variances caused by two Yuanping earthquakes(2009 and 2016). The results indicate that the evolution process of the gravity field variation(0.5 a time scale) of these two earthquakes is“minor change before earthquake → reverse change → earthquake occurred near zero isoline and high-gradient belts →post-earthquake adjustment.” Multiple time-scale gravity field variations show that the earthquakes occurred near 0 isoline and the magnitude of gravity change before the earthquakes is approximately 40 to 50 μGal.
