基于载荷模型的易县地震台伸缩仪NS向异常变化定量分析  

Quantitative Analysis of NS Direction Anomaly Change of Extensometer at Yixian Seismic Station Based on Load Model

作　　者：侯晓真[1,4] 屈曼 马栋[1,4] 陈建国 高晨[1,4] 张娜 龚燕民[3] 齐玉妍 刘晓磊 HOU Xiao-zhen;QU Man;MA Dong;CHEN Jian-guo;GAO Chen;ZHANG Na;GONG Yan-min;QI Yu-yan;LIU Xiao-lei(Hebei Earthquake Agency, Shijiazhuang, Hebei 050021, China;Baoding Central Seismic Station, Hebei Earthquake Agency, Baoding, Hebei 071000, China;Yixian Seismic Station, Hebei Earthquake Agency, Yixian, Hebei 074200, China;National Field Scientific Observation and Research Station for Huge Thick Sediments and Seismic Disasters in Hongshan, Hebei Province, Xingtai, Hebei 054000, China)

机构地区：[1]河北省地震局,河北石家庄050021 [2]河北省地震局保定地震监测中心站,河北保定071000 [3]河北省地震局易县地震台,河北易县074200 [4]河北红山巨厚沉积与地震灾害国家野外科学观测研究站,河北邢台054000

出　　处：《山西地震》2021年第4期33-37,56,共6页Earthquake Research in Shanxi

基　　金：中国地震局震情跟踪定向工作任务青年课题(2021010214);中国地震局地震科技星火计划攻关项目(XH19008)。

摘　　要：在日常会商分析数据过程中,发现易县地震台伸缩仪NS向自2021年3月26日以来张性变化速率及幅度增大。为做好震情跟踪及异常性质研判工作,河北省地震局联合保定中心站、易县地震台进行现场踏勘,应用3种荷载计算模型对可能造成该影响的干扰源进行定量分析。根据模型计算结果、时间相关性及后续伸缩仪NS向曲线变化形态,综合分析认为,3月26日至4月9日伸缩仪NS向异常变化是由周围两处山坡梯田改造引起。In the process of daily consultation and analysis of data,it is found that the extensional change rate and amplitude of extensometer NS at Yixian Seismic Station have increased since March 26,2021.In order to do a good job in earthquake situation tracking and abnormal nature research and judgment,Hebei Earthquake Agency,together with Baoding Central Station and Yixian Seismic Station,conducted a field survey,and applied three load calculation models to quantitatively analyze the interference sources that may cause the impact.According to the model calculation results,time correlation and the subsequent ns direction curve change form of the extensometer,the comprehensive analysis shows that the abnormal NS direction change of the extensometer from March 26 to April 9 is caused by the transformation of two surrounding hillside terraces.

关 键 词：载荷模型 张性速率 伸缩仪 易县地震台 

分 类 号：P315.725[天文地球—地震学]