2021年6月10日云南双柏M_(S)5.1和6月12日云南盈江M_(S)5.0地震总结  

Summary of Shuangbai M_(S)5.1 earthquake on June 10,2021,and Yingjiang M_(S)5.0 earthquake on June 12,2021,in Yunnan

作　　者：于晨 周志华[1] 解孟雨 张小涛[1] 韩颜颜[1] 苑争一 黎明晓[1] 姚丽[1] 田雷 YU Chen;ZHOU Zhihua;XIE Mengyu;ZHANG Xiaotao;HAN Yanyan;YUAN Zhengyi;LI Mingxiao;YAO Li;TIAN Lei(China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]中国地震台网中心,中国北京100045

出　　处：《地震地磁观测与研究》2022年第5期151-168,共18页Seismological and Geomagnetic Observation and Research

基　　金：国家重点研发计划(项目编号:2018YFE0109700);中国地震台网中心青年基金(项目编号:QNJJ-202102);国家自然科学基金联合基金(项目编号:U2039205)。

摘　　要：2021年6月10日和6月12日,云南地区先后发生双柏M_(S)5.1和盈江M_(S)5.0地震,距5月21日云南漾濞M_(S)6.4地震发生不足1个月,文中系统总结2次地震前出现的地震活动和地球物理观测异常,其中:地震活动方面:震前存在中等调制地震集中、地震条带等中短期异常;地球物理观测方面:2次地震发生前,震中附近存在形变、电磁和流体等多项异常,其中双柏M_(S)5.1地震以形变学科趋势异常为主,盈江M_(S)5.0地震以流体异常为主。对2次地震序列跟踪分析,发现双柏M_(S)5.1地震余震较为丰富,震后半年内共记录M_(L)3.0以上地震7次,最大震级为M_(L)4.8,计算得到地震序列活动参数为:h值=1.23,b值=0.85;盈江M_(S)5.0地震发生后半年内仅记录M_(L)3.0以上余震4次,最大余震为M_(L)3.3地震,计算得到地震序列活动参数为:h值=2.45、b值=1.04。综合分析认为,2021年6月云南地区2次5级以上地震与漾濞M_(S)6.4地震形成5、6级地震连发态势,区域地震活动水平较强,多项具有中短期意义的地球物理观测异常仍在持续。On June 10 and June 12,2021,Shuangbai M_(S)5.1 and Yingjiang M_(S)5.0 earthquakes occurred successively in Yunnan.It was less than one month after the Yunnan Yangbi M_(S)6.4 earthquake on May 21.This paper systematically summarizes the seismicity and geophysical observation anomalies before the Shuangbai M_(S)5.1 and Yingjiang M_(S)5.0 earthquakes.In terms of seismicity,there are medium and short-term anomalies such as medium modulation earthquake concentration and M 4.0 earthquake belt before the earthquakes.In terms of geophysical observation,there were many anomalies in deformation,electromagnetic,and fluid observations near the epicenter of the two earthquakes before the occurrence.Deformation anomalies were mainly near the epicenter of the Shuangbai M_(S)5.1 earthquake and fluid anomalies were mainly near the epicenter of the Yingjiang M_(S)5.0 earthquake.After analyzing the sequence tracking of the two earthquakes,it is found that there are abundant aftershocks after the Shuangbai M_(S)5.1 earthquake.Seven aftershocks above M_(L)3.0 have been recorded in half a year,and the maximum magnitude is M_(L)4.8.The calculated sequence hvalue is 1.23 and b value is 0.85.Four aftershocks above M_(L)3.0 were recorded within half a year after the Yingjiang M_(S)5.0 earthquake,with the maximum magnitude of M_(L)3.3.The calculated sequence h value is 2.45 and b value is 1.04.Comprehensive analysis shows that in June 2021,two M_(S)≥5.0 earthquakes and the Yangbi M_(S)6.4 earthquake in Yunnan formed a continuous occurrence trend of M≥5-6 earthquakes,the regional seismicity level is high,a number of geophysical observation anomalies with medium and short-term significance are still continuing.

关 键 词：双柏M_(S)5.1地震 盈江M_(S)5.0地震 地震活动性异常 地球物理观测异常 序列跟踪 

分 类 号：P315[天文地球—地震学]