2021年11月17日13时54分(北京时间)江苏盐城市大丰区海域发生MS 5.0地震。江苏盐城、南通等地区震感强烈,上海普遍有感,山东和浙江等部分地区亦有震感。上海地震台在震后7 min发布人工速报结果,并启动地震应急产品产出工作,产品包括地震基本参数、历史地震、地震构造、震源机制、仪器烈度和余震精定位等数据。本次地震发生在黄海南部坳陷地区,震源机制解表明该地震为一次走滑型事件,断层呈NE走向,余震主要沿主震NE方向拓展约20 km,深度集中在15 km以内范围。
The MS 5.0 earthquake struck at 13:54(UTC+8) on November 17,2021,Beijing time,in Dafeng sea area,Yancheng City,Jiangsu Province.The tremors were felt strongly in Yancheng,Nantong and other areas of Jiangsu Province,generally in Shanghai,and also in some areas of Shandong Province and Zhejiang Province.Shanghai Seismic Station reported the formal quick report in 7 min after the earthquake and started to work on the emergency output of earthquake-related products including basic seismic parameters,historical earthquakes,seismological tectonics,focal mechanism,instrumental intensity and aftershocks precision positioning and so on.The earthquake occurred in the south depression of Yellow Sea.The focal mechanism result suggests a strike-slip event and the strike direction is northeast.The aftershock mainly expands about 20 km along the southeast direction of the main earthquake.The depth is concentrated within 15 km.
2022,43(3): 172-177 收稿日期:2022-4-28
DOI:10.3969/j.issn.1003-3246.2022.03.024
基金项目:上海佘山地球物理国家野外科学观测研究站资助项目(项目编号:2020K07)
作者简介:于海英(1970-),女,高级工程师,主要从事地震学研究工作。E-mail:6168658@qq.com
参考文献:
林命週.上海附近海域的地震研究和滨海地震学[M].北京:地震出版社,2009.
张爱萍. Cut and Paste方法在地震学中的应用[D].合肥:中国科学技术大学,2008.
中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会. GB 18306-2015中国地震动参数区划图[S].北京:中国标准出版社,2016.