中国台湾M_(S)≥5.5地震前后汕头气汞远场异常特征  

Far-field anomaly characteristics of mercury vapor observations in Shantou before and after the M_(S)≥5.5 earthquakes in Taiwan,China

作　　者：张惠霞 薛艳[2] 张伟浩 姜祥华 邓志辉[3] ZHANG Huixia;XUE Yan;ZHANG Weihao;JIANG Xianghua;DENG Zhihui(Shantou Earthquake Agency,Guangdong Province 515041,China;China Earthquake Networks Center,Beijing 100045,China;Guangdong Earthquake Agency,Guangzhou 510070,China)

机构地区：[1]汕头市地震局,广东515041 [2]中国地震台网中心,北京100045 [3]广东省地震局,广州510070

出　　处：《地震地磁观测与研究》2024年第5期89-97,共9页Seismological and Geomagnetic Observation and Research

基　　金：国家重点研发计划(项目编号:2023YFC3008600);2024年度中国地震局老科技工作者课题(项目编号:202411);南方海洋科学与工程广东省实验室(珠海)创新团队项目(项目编号:99147-42080024);广东省科技计划(项目编号:2019B020208014)。

摘　　要：通过对2020年5月至2022年12月汕头气汞测值的分析,总结中国台湾地区M_(S)≥5.5地震前后汕头气汞远场异常特征。结果表明:在研究时段,台湾地区共发生M_(S)≥5.5地震19次,主要集中在花莲、台东和宜兰3个地区;在这些地震前后,汕头气汞整点值曲线均出现明显的异常变化,且3个地区震前异常特征各不相同,而同一地区异常形态具有较好的重复性。采用R值评估方法,检验研究时段内汕头气汞日均值对台湾地区M_(S)≥5.5地震的预测效能,结果发现,当气汞异常阈值取0.066 ng/L、0.067 ng/L、0.068 ng/L,预报时间为5—9天时,R>R_0,表明汕头气汞对台湾地区M_(S)≥5.5地震具有短临预测意义。Based on the analysis of mercury vapor observations in Shantou from May 2020 to December 2022,the far-field anomaly characteristics before and after M_(S)≥5.5 earthquakes in Taiwan region were studied.The results show that:during the period,there were 19 M_(S)≥5.5 earthquakes mainly concentrated in three areas:Hualian,Taidong,and Yilan.Before and after these earthquakes there were many obvious abnormal changes in the hourly value observations of mercury vapor in Shantou.The anomaly characteristics differed for earthquakes in different concentration areas,while the anomaly shapes in the same region had good repeatability.The R-value assessment method was used to test the prediction efficiency of the daily mean on M_(S)≥5.5 earthquakes in Taiwan region during the study period.The results found that when the mercury vapor anomaly threshold is 0.066 ng/L,0.067 ng/L,0.068 ng/L,the forecast time is 5-9 days,R>R0,indicating that the Shantou mercury vapor has short-period prediction significance for M_(S)≥5.5 earthquakes in Taiwan region.

关 键 词：中国台湾地震 汕头气汞 远场异常特征 预测效能检验 短临预测意义 

分 类 号：P315.72[天文地球—地震学]