2021年5月22日青海玛多M7.4地震的快速测定与数据产品产出  

Fast Determination and Data Production Related to the M7.4 Earthquake on May 22,2021 in Maduo,Qinghai Province

作　　者：邓文泽 杨志高[1] 席楠[1] 刘敬光[1] 戴丹青 梁建宏[1] 杜广宝[1] 孙丽[1] 黄志斌[1] Deng Wenze;Yang Zhigao;Xi Nan;Liu Jingguang;Dai Danqing;Liang Jianhong;Du Guangbao;Sun Li;Huang Zhibin(China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]中国地震台网中心,北京100045

出　　处：《中国地震》2021年第2期541-550,共10页Earthquake Research in China

基　　金：中国地震局监测预报司经常性项目“大震应急产品产出系统运维”(12150411007)资助。

摘　　要：2021年5月22日02时04分11.3秒(北京时间)青海果洛州玛多县发生M7.4地震。中国地震台网中心在震后立即启动余震监测和统计工作,于震后9min发布正式速报结果。同时,中国地震台网中心联合多家单位,共产出9类14种数据产品。产品结果显示,本次地震发生在巴颜喀拉块体,位于甘德南缘断裂带和玛多甘德地震带之间,推测极震区的烈度达到Ⅸ度;震源机制解显示该地震为一次走滑型事件,余震在震中两侧均有分布,总体呈NW-SE走向;震源破裂过程的结果表明本次地震持续时间约为45s,主要能量在震后30s释放,地震的破裂方式为双侧破裂,最大滑移量达4.5m,地壳浅层滑动位移量较大,推测可能存在地表破裂。A magnitude 7.4 earthquake hit Maduo,Qinghai Province,China at 02:04am(local time,CST)on May 22,2021.China Earthquake Networks Center reported the formal quick report in 9 minutes,and started to monitor the aftershocks immediately.Meanwhile,China Earthquake Networks Center organized some related institutions,and quickly produced 14 scientific data products of 9 categories.These products imply that this earthquake occurred in Bayan Har block,located between the Gande-Maduo faults and Gande south rim fault in terms of regional tectonics.The estimated intensity of the epicenter area reached IX degree with the focal mechanism of a strike-slip event.The aftershocks concentrate in a narrow NW-SE band with main shock located in its center.The rupture process is a bilateral mode and lasts 45 s.The majority energy releases in the first 30s and the maximum slip reaches 4.5 meters in the shallow crust which may cause surface fracture.

关 键 词：青海玛多地震 地震速报 余震 震源机制 震源破裂 数据产品 

分 类 号：P315[天文地球—地震学]