山西昔阳地震台水平摆观测受降雨影响的数值分析  

Effect of Rainfall on Observation of Horizontal Pendulum Tiltmeter in Xiyang Seismological Station

作　　者：李宏伟[1,2] 刘瑞春[1,2] 王霞[1,2] 吕永青[3,2] 王秀文[1,2] 

机构地区：[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025 [3]山西省地震局昔阳地震台,山西昔阳045300

出　　处：《山西地震》2016年第2期1-4,共4页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-1509)

摘　　要：在考察昔阳地震台山洞覆盖层厚度、硐室密封性及周边环境等基础上,采用FLAC3D数值模拟分析方法,结合研究区DEM数据和降雨量,定量分析2013年7月12日昔阳台水平摆观测值异常变化。考虑降雨连续性以及降雨滞后的影响,综合分析设定最大积水区域的荷载等效为0.2m厚度的雨水,通过计算得出,台站所在位置向南倾斜1.419角秒,向西倾斜1.459角秒,与实际观测值较为相符,认为本次数据变化与降雨有密切关系,非地震前兆异常。On the basis of investigation of the thickness of the overburden,the sealing property and surrounding environment of the cave in Xiyang Seismological Station,the abnormal changes of observation value of horizontal pendulum tiltmeter on July 12,2013 are analyzed quantitatively by using FLAC3D numerical simulation method.The analysis is combined with DEM data and rainfall in the study area.Considering the continuity and the lag of rainfall,the load of the maximum water accumulation area is set equivalent to 0.2mthickness of the rain.It is obtained that the station location is tilt to the South for 1.419 arcsecond and tilt to the West for1.459 arcsecond.This conclusion is consistent with the actual observed values.It is considered that the data is closely related to rainfall,but not the earthquake precursor anomaly.

关 键 词：异常分析 水平摆 昔阳地震台 

分 类 号：P315.63[天文地球—地震学]