2023年8月23 日 18时19分47秒辽宁省大连市普兰店区发生M4.6地震.针对此次地震,对辽宁地区定点形变观测资料进行了梳理,分析了各观测仪器记录到的同震响应形态、震后曲线变化形态,相对震中的空间分布特征以及记录同震仪器测项的占比情况,对辽宁地区定点形变观测仪器的同震特征进行了综合分析.其中,水平摆倾斜仪和水管倾斜仪记录到的同震变化相对较少,体应变观测记录到的同震变化不明显,钻孔倾斜仪和宽频带倾斜仪记录到的同震变化较为明显.总体来说,不同种类的形变观测仪器在同震特征方面存在差异.
A magnitude 4.6 earthquake occurred at 18:19:47 on August 23,2023,in Pulandian District,Dalian City,Liaoning Province.In response to this earthquake,this paper compiles the fixed-point defor-mation observation data in Liaoning area,analyzes the coseismic data pattern recorded by each observation instrument,the shape of the postseismic curve,the spatial distribution relative to the epicenter,and the percentage of the recorded coseismic instrumental measurements,and conducts a comprehensive analysis of the coseismic characteristics of the fixed-point deformation observation instruments in Liaoning area.Among them,the coseismic changes recorded by the horizontal pendulum inclinometer and the water pipe inclinom-eter are relatively small,the coseismic changes recorded by the body strain observation are not obvious,the coseismic changes recorded by the borehole inclinometer are more obvious,and the coseismic changes recorded by the broadband inclinometer are also more obvious.Overall,there are differences in the coseis-mic characteristics of different kinds of deformation observation instruments.