平原M_(S)5.5地震与流动重磁应急观测分析  

The Pingyuan M_(S)5.5 earthquake and emergency observation and analysis of the mobile gravity and magnetism

作　　者：陆汉鹏[1] 王锋吉[1] 张刚[1] 颜启[1] 李树鹏 Lu Hanpeng;Wang Fengji;Zhang Gang;Yan Qi;Li Shupeng(Shandong Earthquake Agency,Shandong Ji’nan 250014,China)

机构地区：[1]山东省地震局,山东济南250014

出　　处：《地震科学进展》2025年第3期135-142,共8页Progress in Earthquake Sciences

摘　　要：介绍了山东平原M_(S)5.5地震概况及地震地质特征,详细阐述了震后流动重力、流动地磁应急观测过程及快速反应处置能力,对震后进行加密观测,分析重磁资料震前震后的变化特征,主要利用近几年的流动重力资料,系统分析了平原M_(S)5.5地震震前重力场半年尺度差分变化、1~3年尺度累积变化的动态演化特征,较好地反映了平原M_(S)5.5地震孕育、发生过程中出现的流动重力急剧上升变化的异常前兆信息及震后重力场反向恢复的有效理论。最后,对流动重磁应急观测结果进行分析,对重力场、应力场及地震关系之间的机理进行了讨论。根据震后应急观测分析,建议应该继续加强重磁融合分析能力,提高分析结果的可靠性,为后续观测及震后进一步分析研判提出可行依据,也为山东地区震后总结及进一步强化流动监测及地震危险区判定提供参考依据。This study provides an overview of the seismic geological characteristics of the M_(S)5.5 earthquake in Pingyuan,Shandong.In this study,the rapid response and disposal capabilities after the earthquake,including mobile gravity and geomagnetic emergency observations,were elaborated,and encrypted observations after the earthquake were conducted.It analyzes the changes in gravity and magnetic data before and after the earthquake.The primary use of mobile gravity data in recent years has been to systematically analyze the dynamic evolution characteristics of the halfyear scale difference change and the 1~3 year scale cumulative change in the gravity field before the M_(S)5.5 earthquake in Pingyuan.It better reflects the abnormal precursor information of the rapid increase in mobile gravity during the development and occurrence of the M_(S)5.5 earthquake in Pingyuan and the effective theory of reverse recovery of the gravity field after the earthquake.Finally,the emergency observation results of mobile gravity and magnetism were analyzed,and the relationship between the gravitational field,stress field,and earthquakes was discussed.Through postearthquake emergency observation and analysis,we should continue to strengthen the capability of gravity and magnetic fusion analysis,improve the reliability of the analysis results,provide a feasible basis for subsequent observation and further analysis and judgment after the earthquake,provide a reference basis for post-earthquake summaries,and strengthen mobile monitoring and earthquake risk zone identification in the Shandong region.

关 键 词：平原地震 流动重力 流动地磁 应急观测 

分 类 号：P315.63[天文地球—地震学]