抚顺与铁岭台伸缩仪同步异常特征分析

Analysis of Synchronization Abnormal Characteristics of Extensometers in Fushun and Tieling Seismic Stations

2019年抚顺与铁岭地震台伸缩仪观测值出现趋势性拉张变化,经过核实,抚顺与铁岭地震台洞体应变均认定为异常并进行跟踪。2020年两项异常开始出现恢复迹象,但自2021年6月开始,抚顺伸缩仪与铁岭伸缩仪再次出现趋势性拉张变化,且两个台站伸缩仪曲线形态具有同步性特征。因此,本文从仪器对比分析、数字滤波及周期分析以及区域长基线GNSS数据结果 3个方面进行分析。结果表明:2021年以来的拉张变化为正常的年变变化,而2019年至今的趋势拉张变化与该区域应力环境变化有关,需持续关注。

In 2019,the observed value of the extensometers at Fushun and Tieling Seismic Stations showed a trend of accelerated changes.After verification,cave body strains of Fushun and Tieling Seismic Stations were identified as anomalies for tracking.In 2020,both anomalies showed signs of recovery.Under the background again,the Fushun extensometer and Tieling extensometer will show a trend of expansion again in 2021,and the curves of the two stations are consistent.In the paper,we analyzed periodic analysis and regional long baseline GNSS data results in three aspects,so we can judge the natural anomalies and provide a basis for future anomaly verifications.