2021年5月22日青海玛多M_(S)7.4地震总结  

Summary of Maduo M_(S)7.4 earthquake in Qinghai on May 22,2021

作　　者：解孟雨 王月 李纲[1] 苑争一 钟骏 邓世广 宋金[1] 于晨 岳冲[1] 黎明晓[1] 李美[1] 解滔[1] 姚丽[1] 臧阳[1] XIE Mengyu;WANG Yue;LI Gang;YUAN Zhengyi;ZHONG Jun;DENG Shiguang;SONG Jin;YU Chen;YUE Chong;LI Mingxiao;LI Mei;XIE Tao;YAO Li;ZANG Yang(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》2021年第6期181-197,共17页Seismological and Geomagnetic Observation and Research

基　　金：地震科技星火计划(项目编号:XH20072);中国地震科学实验场的地震可预测性国际合作研究(项目编号:2018YFE0109700);中国地震台网中心青年项目“强震危险地点预测方法研究——以南北地震带为例”。

摘　　要：系统梳理2021年5月22日青海玛多M_(S)7.4地震发生前地震活动异常特征、地球物理观测异常以及区域构造情况,结果如下:①玛多M_(S)7.4地震发生在巴颜喀拉块体内部,发震断层应为昆仑山口—江错断裂;②地震发生前存在地震平静、带状分布等地震活动异常;③存在形变、电磁和流体异常,其中流体异常对于该地震具有一定的短期预测意义。玛多M_(S)7.4地震序列类型为主震—余震型,余震较为丰富,序列持续衰减特征明显。综合分析认为,玛多地震前存在多种地震活动和地球物理观测异常,其中流体异常为本次地震的时间和地点预测提供了有效依据。An earthquake with the magnitude of M_(S)7.4 occurred in Maduo County,Qinghai Province on May 22,2021.The historical seismicity,geophysical observations before the mainshock and tectonic background are systematically summarized in this paper.The results show that:(1)The Maduo M_(S)7.4 earthquake occurred in Bayankala block,and the seismogenic fault of this earthquake is the Kunlun Pass-Jiangcuo fault;(2)Seismic quiescence,earthquake gap,beltlike seismic distribution,and other seismicity anomalies emerged before the occurrence of the Maduo M_(S)7.4 earthquake;(3)There are geophysical anomalies before the Maduo M_(S)7.4 earthquake which contains anomalies relate to deformations,electromagnetic anomalies,and fuid anomalies,in which fuid anomalies show certain short-term prediction signifcance for the earthquake.The seismic activity of the Maduo M_(S)7.4 earthquake sequence indicates that the Maduo M_(S)7.4 earthquake sequence is a mainshock–aftershock sequence.Moreover,there are plenty of aftershocks and the current daily cumulative rate of the sequence shows an attenuation trend.The systematical analysis of the Maduo M_(S)7.4 earthquake indicates that various seismic and geophysical anomalies emerged before the Maduo M_(S)7.4 earthquake in which fuid anomalies provided effcient clues for forecasting the time and location of the subsequent earthquakes.

关 键 词：玛多M_(S)7.4地震 序列特征 地震活动异常 地球物理观测异常 

分 类 号：P315[天文地球—地震学]