云南地区氡异常与地震的统计特征分析  

Statistical characteristics analysis on the relationship between radon anomalies and earthquakes in Yunnan region

作　　者：李琼[1] 付虹[1] 胡小静[1] 杜家云 杨黎 Li Qiong;Fu Hong;Hu Xiaojing;Du jiayun;Yang Li(Yunnan Earthquake Agency,Kunming 650224,China;Mile Earthquake Agency,Yunnan Mile 652300,China)

机构地区：[1]云南省地震局,昆明650224 [2]弥勒市地震局,云南弥勒652300

出　　处：《地震学报》2024年第2期340-352,共13页Acta Seismologica Sinica

基　　金：地震科技星火计划公关项目(XH230483C)资助.

摘　　要：通过梳理1976—2022年震例总结报告中云南地区73组M_(S)≥5.0地震的氡测项异常,对其特征予以统计分析。结果表明:73组地震中有63组震前出现水氡异常,震前6个月内的短期异常占总异常的71%,3个月内的短临异常占总异常的49%,地震前3个月异常数量增加显著;震级越大,异常分布越远离震中,震前1个月新出现的异常大部分集中在震中附近。相对而言,由于测点位置和观测技术方面的原因,气氡积累的震例远远少于水氡,但具有短期异常占比较高的优势。随着气氡观测技术的不断改进和观测经验的不断积累,其捕捉地震异常信息的能力也将会不断提升。This paper is based on the summary report of Yunnan earthquake cases from 1976 to 2022.It sorts out 73 sets of earthquakes with M≥5.0 one by one,and extracts abnormal information of radon measurement items before earthquakes,then explores the characteristics of radon precursory anomalies.The results are as follows:1)There were 190 water radon anomalies among 63 out of 73 earthquakes.There were a large number of anomalies and a low earthquake missing rate,indicating that water radon observation have good monitoring capability for regional earthquakes.However,the proportion of gas radon anomalies is relatively low by comparison.In our earthquake cases,there were five gas radon anomalies among only four out of 39 earthquakes,showing a higher earthquake missing rate.But as for the measurement sites with good basic conditions,gas radon anomalies have a high repetition rate,and correspond well to earthquakes.Among the five radon anomalies accumulated in historical earthquake cases,three of them were observed by gas radon well Gaoda.2)The water radon anomalies appeared mainly within six months before earthquakes with M≥5.0,accounting for 71% of the total anomalies.Among them,anomalies within three months account for 49% of the total anomalies.Starting from the year before the M5.0−5.9 earthquakes,the number of water radon anomalies in different stages increased significantly.One month before the earthquake,most of the anomalies showed a turning point and then returned to normal level,with a decrease in the number of anomalies.On the other hand,there are not many earthquake cases with abnormal gas radon concentration,but all anomalies are within six months before earthquakes,of which 80%are within three months.3)The spatial distribution of water radon anomalies is different before earthquakes with different magnitudes.Before the earthquakes with magnitude 5.0−5.9,the closer to the time of the earthquake occurrence,the more anomalies are concentrated near the epicenter.During the period of more than six months pri

关 键 词：氡 地震异常 地震预测 统计特征 

分 类 号：P315.75[天文地球—地震学]