同场地不同钻孔应变观测资料对比  

Comparison of Strain Observation Data of Different Borehole Strain in the Same Site

作　　者：张肖 王虹宇 李慧[2] 刘思宇 ZHANG Xiao;WANG Hongyu;LI Hui;LIU Siyu(Xiong’an Earthquake Disater Prevention Center,Xiong’an 071700,China;Mobile Survey Team of Hebei Earthquake Agency,Baoding 071000,China)

机构地区：[1]雄安新区震灾预防中心,河北雄安071700 [2]河北省地震局流动测量队,河北保定071000

出　　处：《华北地震科学》2022年第3期76-82,共7页North China Earthquake Sciences

基　　金：中国地震局监测、预测、科研三结合课题(CEA-JC/3JH-170404);河北省地震科技星火计划攻关项目(DZ202108090115)。

摘　　要：对易县台同场地不同钻孔应变仪观测资料进行研究,分析易县台四分量钻孔应变的可靠性及其体应变的相关性,再分析不同钻孔应变观测对特殊事件的响应。结果显示:①易县台四分量钻孔应变观测自检程度不高,需进行实地相对标定;进行相对标定时,选取差分值数据有利于提高数据信度;②将四分量钻孔应变的S_(1)+S_(3)、S_(2)+S_(4)与体应变进行相关性分析,S_(1)+S_(3)和体应变的皮尔森相关系数略高于S_(2)+S_(4)与体应变的相关系数;③对于特殊事件响应方面,体应变和四分量钻孔应变两组面应变受抽水干扰均为张性变化,变化量高于体应变,体应变和四分量钻孔应变的S_(1)+S_(3)的相关系数要高于体应变和S_(2)+S_(4)的皮尔森相关系数;对同震响应方面,不同钻孔应变的同震响应一致性较好,且相关系数与震级大小有关。This paper studies the observation data of different borehole strain gauges in the same site at Yixian Station,analyze the reliability of the four-component borehole strain and its correlation with body strain,and then analyze the response of different borehole strain observations to special events.The result shows that:1)The 4-component borehole strain observation at Yixian Station is not very self-consistent and requires field relative calibration;when performing relative calibration,the selection of difference value data is beneficial to improve the reliability of the data;2)The Pearson correlation coefficient of S_(1)+S_(3) and body strain is slightly higher than that of S_(2)+S_(4) and body strain;3)In terms of response to special events,the volume strain and the four-component borehole strain show tensile changes due to pumping disturbance,and the variation is higher than the volume strain.The correlation coefficient between volume strain and S_(1)+S_(3) is higher than volume strain and S_(2)+S_(4).In terms of co-seismic response,the co-seismic response of different borehole strains is consistent,and the correlation coefficient is related to the magnitude of the earthquake.

关 键 词：同场地 四分量钻孔应变 体应变 皮尔森相关系数 

分 类 号：P315.725[天文地球—地震学]