九寨沟7.0级地震前电离层TEC异常分析  

Analysis of ionospheric TEC anomalies before the Jiuzhaigou Ms 7.0 earthquake

作　　者：张明敏 刘智敏[1,2] 刘盼 从建锋 ZHANG Mingmin;LIU Zhimin;LIU Pan;CONG Jianfeng(School of Surveying and Mapping Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Surveying and Mapping Technology of the Island(reef)Surveying and Mapping Bureau of Geographic Information,Qingdao 266590,China)

机构地区：[1]山东科技大学测绘科学与工程学院,山东青岛266590 [2]海岛(礁)测绘技术国家测绘地理信息局重点实验室,山东青岛266590

出　　处：《测绘工程》2018年第12期24-30,共7页Engineering of Surveying and Mapping

基　　金：国家自然科学基金(41374009);青岛市博士后应用研究项目(2015186)

摘　　要：以2017-08-08四川省九寨沟Ms7.0地震为背景,利用IGS提供的全球电离层格网数据,采用滑动四分位距法对震中所在网格的四个格网点进行TEC异常分析。发现震前13天,震前4天和地震当天分别出现了不同程度的电离层异常。结合同时段的太阳地磁活动情况,可以确定地震当天的电离层异常与此次地震的相关性。进一步分析电离层异常的空间分布后,确认震前13天的电离层异常可作为九寨沟地震的前兆,而震前4天出现的电离层异常是由地磁剧烈活动引起的。Based on the Ms 7.0 earthquake in Jiuzhaigou,Sichuan Province on August 8,2017,and with the global ionospheric grid data provided by IGS,the sliding quartile method is used to analyze the four grid points of the grid in the epicenter Perform TEC anomaly analysis.Thirteen days before the earthquake,four days before the earthquake and the earthquake on the same day,respectively,have the varying degrees of ionospheric anomalies.Combined with the days of the sun geomagnetic activity,this paper can determine the correlation between the ionosphere anomaly of earthquake day and this earthquake.After the further analysis of ionospheric anomalies’spatial distribution,it is confirmed that the ionospheric anomaly that occurred 13 days before the earthquake can be used as a precursor to the Jiuzhaigou earthquake.The ionospheric anomaly that occurred four days before the earthquake was caused by geomagnetic intense activity.

关 键 词：电离层异常 九寨沟地震 TEC 滑动四分位距法 地震预报 

分 类 号：P228[天文地球—大地测量学与测量工程]