利用巴仑台钻孔应变观测资料检测地球自由振荡  

DETECTION OF EARTH FREE OSCILLATION BY BOREHOLE STRAINMETER OBSERVATION DATA ON BALUNTAI STATION

作　　者：李姗姗[1] 张小飞[1] 单晓琳 刘青山 LI Shan-shan;ZHANG Xiao-fei;SHAN Xiao-lin;LIU Qing-shan(Korla Earthquake Monitoring Central Station of Earthquake Agency of Xinjiang Uygur Autonomous Region,Korla 841000,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局库尔勒地震监测中心站,新疆库尔勒841000

出　　处：《内陆地震》2022年第4期353-361,共9页Inland Earthquake

基　　金：新疆地震科学基金课题(202124).

摘　　要：利用巴仑台钻孔应变观测资料,采用功率谱密度估计方法,获得2019年5月26日秘鲁M_(S)7.8地震激发的0S 3~0S 30球形自由振荡数据,与PREM模型理论值对比分析。同时分析大震平静时段观测数据功率谱密度,确认提取的自由振荡数据真实可靠。结果表明:巴仑台钻孔应变检测到的地球自由振荡观测值与PREM模型理论值基本吻合,巴仑台钻孔应变仪NW、EW分量数据对超低频长周期信号的观测能力相对良好。本研究结果对了解地球内部结构有一定的帮助,有助于更精细地研究地球模型。Using observation data of borehole strainmeter at Baluntai station and power spectral density estimation method,we acquired the 0S 3~S 30 spherical free oscillation caused by M_(S)7.8 earthquake on May 26,2019 in Peru,and then compared it with the theoretical free oscillation frequencies of preliminary reference earth model.The results showed that the observed frequencies of earth free oscillation detected by Baluntai borehole strainmeter was basically consistent with those predicted by PREM model,and NW and EW components of borehole strainmeter at Baluntai station had relatively good observation ability for ultra-low frequency and long-period signals.The results of this study may be helpful to understand the structure in deep earth and to study the earth model in more detail.

关 键 词：地球自由振荡 PREM模型 分量式钻孔应变 秘鲁M_(S)7.8地震 

分 类 号：P315.7[天文地球—地震学]