2021年9月16日乳山海域M_(L) 2.9地震--一次远场面波触发的小震活动?  

The M_(L) 2.9 earthquake in the Rushan sea area on September 16,2021-A small earthquake triggered by far-field surface wave?

作　　者：郑建常[1] 杜宪宋[1] 王梅[1] ZHENG Jianchang;DU Xiansong;WANG Mei(Shandong Earthquake Agency,Jinan 250102,China)

机构地区：[1]山东省地震局,济南250102

出　　处：《地震地磁观测与研究》2022年第S01期52-55,共4页Seismological and Geomagnetic Observation and Research

基　　金：中国地震科学实验场地震可预测性国际合作项目(项目编号:2018YFE0109700)。

摘　　要：大地震造成的地面运动可能在远场触发微震。通过对比检视胶东半岛地区应变仪和强震仪记录,估算2021年9月16日四川泸县M_(S) 6.0地震在该区造成的动态应力变化,从而认为其后在乳山海域发生的M_(L)2.9地震可能是受到此次泸县M_(S) 6.0地震触发的一次小震活动。Strong earthquakes can trigger micro-earthquakes in far fields.An M_(L) 2.9 earthquake occurred in the Rushan sea area several minutes after the Sept.16,2021,Luxian M_(S) 6.0 earthquake.We examine records of strainmeters and strong motion accelerographs in the Jiaodong Peninsula and estimate the dynamic stress caused by the Luxian M_(S) 6.0 earthquake.We finally conclude that the Rushan M_(L) 2.5 earthquake might be triggered by the Luxian M_(S) 6.0 earthquake.

关 键 词：远场面波触发 固体潮汐 应力扰动 

分 类 号：P315[天文地球—地震学]