湖北巴东Ms5.1地震前宜昌台洞体应变观测资料变化原因分析  

ANALYSIS FOR CHANGES OF CAVE STRAIN DATA AT YICHANG SEISMOSTATION BEFORE Ms5.1 BADONG EARTHQUAKE

作　　者：蒋玲霞[1,2] 孙伶俐[1,2] 李明 罗俊秋[1,2] 戴苗[1,2] 

机构地区：[1]湖北省地震局,武汉430071 [2]中国地震局地震研究所(地震大地测量重点实验室),武汉430071

出　　处：《大地测量与地球动力学》2014年第3期39-42,共4页Journal of Geodesy and Geodynamics

摘　　要：采用常规数值方法与小波变换方法对巴东Ms5.1地震前宜昌台洞体应变资料的异常变化现象进行分析,结果表明存在超过2倍均方差现象,异常起始时间与台站附近土石方开挖起始时间一致。用地表集中荷载模型计算土石方开挖引起的荷载变化对应变的影响,结果表明,理论值比实际观测值小一个数量级,因此该异常变化不能仅归结于土石方开挖引起的荷载变化,可能存在其他干扰因素或地壳应力的变化。The data of cave strain at Yichang Seismostation before the Ms 5.1 Hubei-Badong earthquake were analyzed with conventional numerical method and wavelet transform method. The result shows the start time of excavation near by was consistent with the time when the abnormal appeared. However, the mean square variance of observation values was larger than that caused by excavation as 2 times. Therefore the abnormal related to not only the load fluctuation of excavation, but also to other confounding factors or crustal strain changes.

关 键 词：洞体应变 小波变换 荷载模型 巴东Ms 5 1地震 地壳应力变化 

分 类 号：P315.7[天文地球—地震学]