基金项目:河北省地震局星火计划面上项目:流动重力剥离法判定京津冀地区未来发生强震的可能性(DZ20200329048)
作者简介:刘洪良(1979- ),男,工程师,主要从事重力测量野外数据采集与处理,地震监测预报工作。E-mail:35374@qq.com
通信作者:王青华(1977- ),男,高级工程师,主要从事重力测量野外数据采集与处理,地震监测预测工作。E-mail:wqh308200@sohu.com
DOI: 10.13512/j.hndz.2021.02.10
利用京津冀地区2018—2020年5月的流动重力观测资料,分析了2020年7月12日河北唐山古冶5.1级地震前不同时间尺度重力场变化。结果 表明: 0.5年尺度重力场变化图像较好地反映了此次地震“震前一年,重力场持续上升(正)变化→震前反向变化→在重力变化梯度带零等值线附近发震”的演化过程;震前0.5年和1年年尺度重力场均显示,地震发生在重力变化零等值线附近。
Based on the mobile gravity observation data of Beijing,Tianjin and Hebei region from 2018 to 2020,the paper analyzed the dynamic changes of regional gravity field at different spatial-temporal scale before Guzhi Ms5.1 earthquake in Tangshan,Hebei on July 12th,2020. The results show that:the half-year-scale gravity changes image before the earthquake better reflects “one year before the earthquake,the gravity field continued to rise(positive)change → reverse change before the earthquake → earthquake occurred near the zero contour of the gravity change gradient zone”the evolution process. The half-year-scale and one-year-scale gravity field changes before earthquake show that the earthquake occurred near the zero contour lines of gravity changes.