摘要
乾陵地震台洞体应变观测年变规律明显,固体潮清晰。2020年1月—2022年3月,NS分量变化趋势由拉张发生转折,呈缓慢压缩形态,调查发现,该趋势变化非干扰所致。为厘清该变化的可能成因,选取台站附近GNSS数据、InSAR形变场,以及陕西部分地震台站及相邻的宁夏回族自治区泾源地震台洞体应变观测资料进行分析,结果发现,乾陵台附近区域最大剪应变率和面应变率在2020年前后出现趋势转折变化,InSAR形变场未发生较大范围的地壳形变,乾陵台附近地区洞体应变存在趋势转折的类似同步变化,说明研究区域地下介质应力调整的可能性较大,需密切跟踪。
The annual variation of the cave strain at Qianling Seismic Station is obvious,and the earth tide is clear.From January 2020 to March 2022,the trend of NS component changed from tension to slow compression,and the survey found that the change was not caused by interference.To clarify the possible causes of this change,GNSS data and InSAR deformation field near the station,and the observation data of cave strain at some seismic stations in Shaanxi and the adjacent Jingyuan Seismic Station in Ningxia Hui Autonomous Region were selected for analysis.The results show that the maximum shear strain rate and surface strain rate in the area near Qianling Seismic Station had a trend turning around 2020,whilethe InSAR deformation field had no large-scale crustal deformation.There weresimilar synchronous trend changes in caves train near Qianling Seismic Station,indicating that the possibility of the stress adjustment of the underground medium in the study area is highand needs to be closely followed.
作者
杨晓东
朱琳
孙昱
吴明
何杨
王卫平
YANG Xiaodong;ZHU Lin;SUN Yu;WU Ming;HE Yang;WANG Weiping(Shaanxi Earthquake Agency,Xi’an 710068,China)
出处
《地震地磁观测与研究》
2023年第3期139-146,共8页
Seismological and Geomagnetic Observation and Research
基金
陕西西安地球深部构造野外科学观测研究站项目。
作者简介
第一作者:杨晓东(1989-),男,工程师,主要从事地震形变观测与研究工作。E-mail:523945655@qq.com。
