云南漾濞M6.4地震前定点形变资料特征分析  

Analysis on Characteristics of Fixed Point Deformation Data before Yangbi M6.4 Earthquake in Yunnan Province

作　　者：张燕 赵莹 施贺青 吴凯 余晨晖 ZHANG Yan;ZHAO Ying;SHI Heqing;WU Kai;YU Chenhui(Key Laboratory of Earthquake Geodesy,CEA,40 Hongshance Road,Wuhan 430071,China)

机构地区：[1]中国地震局地震大地测量重点实验室,武汉市430071

出　　处：《大地测量与地球动力学》2022年第3期221-224,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所和应急管理部国家自然灾害防治研究院基本科研业务费专项(IS201926300)。

摘　　要：对2021-05-21云南漾濞M6.4地震震中200 km内的水管仪和伸缩仪2015-01-01~2021-05-20整时值观测资料进行分析和处理发现,自2019年开始各台站的两套仪器观测曲线都同步出现趋势性转折或年变幅度减小的现象,且异常出现时间与震中距有一定的关系:震中距越近,异常出现的时间越早;震中距越远,异常出现的时间相对越晚。We analyze and process the whole time observation data,from January 1,2015 to May 20,2021 of the water tube instrument and the extensometer within 200 km of the epicenter of the May 21,2021 M6.4 Yangbi,Yunnan earthquake.We find that from 2019,the observation curves of the two sets of instruments at each station show trend change or the annual change amplitude decreases at the same time.There is a certain relationship between the time of anomaly occurrence and epicentral distance.The time of anomaly occurrence at stations near the epicenter is earlier than that at stations far away from the epicenter.

关 键 词：漾濞6.4级地震 定点形变 趋势转折 年变幅 

分 类 号：P315[天文地球—地震学]