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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
邓文泽, 杨志高, 席楠, 刘敬光, 戴丹青, 梁建宏, 杜广宝, 孙丽, 黄志斌
中国地震台网中心, 北京 100045
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。
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
DOI:
分类号:P315
基金项目: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
Fast Determination and Data Production Related to the M7.4 Earthquake on May 22,2021 in Maduo,Qinghai Province
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
Abstract:
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 45s. 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.
Key words:  Qinghai Maduo earthquake  Seismic quick report  Aftershocks  Focal mechanism  Rupture process  Data products