中、强震前川滇块体遥感红外辐射异常分析——以宁蒗M5.7地震和鲁甸M6.5地震为例  

Anomalies of Thermal-Infrared Radiation Based on Remote Sensing in the Sichuan-Yunnan Block before Medium to Strong Earthquakes:a Case Study of Ninglang M5.7 and Ludian M6.5 Earthquakes

作　　者：路茜[1] 张铁宝[1] 崔静 杨星 LU Qian;ZHANG Tiebao;CUI Jing;YANG Xing(Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China;2.National Institute of Natural Hazards,Beijing 100085,China)

机构地区：[1]四川省地震局,四川成都610041 [2]国家自然灾害防治研究院,北京100085

出　　处：《地震工程学报》2021年第3期565-574,582,共11页China Earthquake Engineering Journal

基　　金：中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项资助项目(ZDJ2018-18);中国地震局监测预报司2020年震情跟踪定向工作任务(青年)(2020010310)共同资助。

摘　　要：许多研究表明中强地震前出现了红外辐射异常。近年来,川滇块体中、强地震频发,利用遥感数据对其红外辐射异常变化开展深入分析十分必要。结合13年MODIS/Terra遥感红外数据,采用空间距平分析法、辐射增强阈值面积指数法及辐射亮温均值低频时间序列法,对2004年4月—2017年6月红外亮温数据进行深入分析,研究川滇块体及周边构造断裂M≥5.5地震的震前异常信息。结果表明:(1)M≥6.0地震在震前3~6个月川滇块体会出现较为明显的红外辐射增强异常现象;(2)震前红外异常并非随机分布,而可能是受到相关块体的控制;(3)以宁蒗M5.7地震和鲁甸M6.5地震为例研究发现,震前辐射增强较高的小范围区域与震中位置存在一定关联。Some researches have shown the existence of thermal-infrared radiation anomalies before moderate to strong earthquakes.Sichuan-Yunnan Block has been considered in this study due to the occurrence of frequent moderate to strong earthquakes in recent years.In Sichuan-Yunnan Block,anomalies analysis of the thermal-infrared radiation based on remote sensing is essential and significant.We used the moderate resolution imaging spectroradiometer(MODIS)or terra thermal-infrared data from April 2004 to June 2017 to analyze the thermal-infrared radiation anomalies in detail.Then,we researched the thermal-infrared anomalies before M≥5.5 earthquakes occurred in Sichuan-Yunnan Block.The results showed that:(1)obvious anomalies of thermal-infrared radiation appeared before the M≥6.0 earthquakes occurred in the study area;(2)infrared anomalies appeared before earthquakes are not randomly distributed,but are restricted by related blocks;and(3)researches on Ninglang M5.7 earthquake and Ludian M6.5 earthquake indicate the correlation between the epicenter and the region of enhanced radiation before the earthquakes occurred.

关 键 词：川滇块体 中强震 红外辐射 宁蒗M5.7地震 鲁甸M6.5地震 

分 类 号：P319[天文地球—固体地球物理学]