2022年泸定M_(S) 6.8地震前丽江狮子山地震台VP垂直摆形变异常特征分析  

Analysis of characteristics of deformation anomalies of VP vertical pendulum at Lijiang Shizishan Seismic Station before the 2022 Luding M_(S)6.8 earthquake

作　　者：陈瑜 吴会梁 匡泳庄 杨珍珍 和丽松 CHEN Yu;WU Huiliang;KUANG Yongzhuang;YANG Zhenzhen;HE Lisong(Lijiang Gucheng District Earthquake Agency,Yunnan Province 674199,China;Lijiang Earthquake Monitoring Center Station,Yunnan Province 674199,China)

机构地区：[1]丽江市古城区地震局,云南674199 [2]丽江地震监测中心站,云南674199

出　　处：《地震地磁观测与研究》2023年第6期93-100,共8页Seismological and Geomagnetic Observation and Research

基　　金：国家自然科学基金(项目编号:41874111)。

摘　　要：2022年9月5日四川泸定发生M_(S) 6.8地震,2022年6月27日起,丽江狮子山地震台VP垂直摆观测数据出现异常变化,呈转折加速倾斜-转折恢复发震特征。为判断该变化是否为此次泸定M_(S) 6.8地震震前异常,选取2022年1月2日宁蒗M_(S) 5.5和4月16日宁蒗M_(S) 4.6地震,利用曲线图、日均值矢量图等进行分析,结合研究区地质构造进行综合判定,认为该台VP垂直摆数据异常变化与此次泸定M_(S) 6.8地震有一定对应关系。The M_(S)6.8 earthquake occurred in Luding,Sichuan,on September 5,2022,and from June 27,2022,the VP vertical pendulum observation data of the Lijiang Shizishan Seismic Station showed an anomalous change,which was characterized by turning accelerated tilt,turning restoration and then earthquake occurrence.In order to determine whether this change is a pre-seismic anomaly of the Luding M_(S)6.8 earthquake,the January 2,2022,Ninglang M_(S)5.5 and April 16,2022,Ninglang M_(S)4.6 earthquakes were selected and analyzed by using curve diagrams and daily mean vector plots,and combined with the geological structure of the study area to make a comprehensive judgment.It is believed that the anomalous changes in the VP vertical pendulum data of this station have a certain corresponding relationship with this Luding M_(S)6.8 earthquake.

关 键 词：泸定M_(S)6.8地震 VP垂直摆 宁蒗地震 川滇菱形块体 

分 类 号：P315.7[天文地球—地震学]