唐山古冶MS5.1地震前丰宁台地磁前兆异常  

Geomagnetic Precursor Anomaly in Fengning Seismic Station before Tangshan Guye MS5.1 Earthquake

作　　者：张玉林[1] 贾立峰[2] 郭亚亚[1] 任俊峰[1] ZHANG Yulin;JIA Lifeng;GUO Yaya;REN Junfeng(Chengde Central Seismic Station,Hebei Earthquake Agency,Chengde 067000,China;Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]河北省地震局承德中心台,河北承德067000 [2]河北省地震局,石家庄050021

出　　处：《华北地震科学》2020年第4期99-104,共6页North China Earthquake Sciences

基　　金：2019年河北地震科技星火计划项目任务(DZ20190423059)。

摘　　要：通过对2018年1月1日至2020年7月15日期间丰宁地震台地磁数据分析时发现,唐山古冶MS5.1地震前,丰宁地震台磁测深视电阻率累加异常,同时发现文安地震台、平谷地震台、静海地震台同步出现加卸载响应比高值异常;2020年5月31日丰宁地震台与文安地震台、黄壁庄地震台、昌黎地震台、红山地震台同步出现地磁逐日比高值异常;丰宁地震台磁测深视电阻率累加异常与代县地震台磁测深视电阻率出现同步异常,加卸载响应比高值异常形成了环首都圈异常区,逐日比高值异常形成了华北异常区。多重异常与地磁加卸载响应比、地磁逐日比高值区域边界曲率预示着地震将发生在唐山老震区,且具有较高的震级,与唐山古冶MS5.1地震的发生相吻合。Through the analysis of geomagnetic data of Fengning seismic station from January 1,2018 to July 15,2020,it was found that before the Tangshan Guye MS5.1 earthquake,the accumulation anomaly of magnetic sounding apparent resistivity of Fengning seismic station was found.At the same time,it was found that the Wenan seismic station,the Pinggu seismic station and the Jinghai seismic station had high loading and unloading response ratio anomaly synchronously.On May 31,2020,the Fengning seismic station,Wenan seismic station,Huangbizhuang seismic station,Changli seismic station and Hongshan seismic station synchronously showed anomalies of daily response ratio.The accumulation anomalies of apparent resistivity of magnetic sounding of Fengning seismic station and that of Daixian seismic station were synchronized with each other.A high loading and unloading response ratio anomaly area around the Capital Circle was formed,and an anomaly area of North China was formed by the anomaly of daily high resistivity.Multiple anomalies,geomagnetic load-unload response ratio,and regional boundary curvature of high value geomagnetic day-to-day ratio indicate a larger earthquake may occur in the Tangshan area,which is consistent with the occurrence of the Tangshan Guye MS5.1 earthquake.

关 键 词：磁测深视电阻率 地磁加卸载响应比 地磁逐日比 丰宁地震台 

分 类 号：P315.722[天文地球—地震学]