玉树7.1级地震热红外与长波辐射异常  

Thermal infrared and long-wave radiation anomalies of Yushu M_S7.1 earthquake

作　　者：魏从信[1,2] 张元生[1,2] 郭晓[1,2] 秦满忠[1,2] 宁亚灵[3] 高见[1] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]中国地震局地震预测研究所兰州创新基地,兰州730000 [3]山西省地震局,太原030021

出　　处：《地球物理学进展》2013年第5期2444-2452,共9页Progress in Geophysics

基　　金：中国地震局兰州地震研究所青年基金(2011Q04);中国地震局地震预测研究所基本科研业务专项(2012A68-9)联合资助

摘　　要：应用中国静止气象卫星FY-2C/2E遥感亮温和长波辐射资料,通过小波变换和相对功率谱估计,分析2010年4月14日玉树MS7.1地震热红外与长波辐射异常特征.该地震热辐射异常明显且易于提取,总体特征为:1)震前约一个月出现,震后逐渐消散,至5月底完全消失;2)异常特征周期都为13天;3)最大幅度达到9倍以上;4)异常总体方向与该区域断层走向呈十字交叉型;5)震中位于异常出现-消失的过渡区域;6)对比亮温和长波辐射,长波辐射异常更接近于震中附近且相对集中,而亮温异常在时间方面的指示作用优于长波辐射.也研究了中国大陆3次7级以上地震热异常异同.According to numerous infrared remote studies, there were thermal anomalies before great earthquakes. It was a natural phenomenon happened during earthquake process. For seismic thermal infrared research, anomalies extracting was important and difficult because of the weak signal and complicated background noise factors. After using wavelet transform （WT） and relative power spectrum （RPS） method based on remote sensing brightness temperature and long-wave radiation data from Chinese geostationary meteorological satellite FY-2C/2E, we analyzed anomaly characteristics of brightness temperature and long-wave radiation on April 14, 2010 Yushu Ms 7.1 earthquake. The seismic thermal radiation anomalies are obvious and easy to extracting. According to the direction of thermal anomalies evolution, we can roughly determine the seismogenic zone. According to abnormal duration, we were able to determine the possibility of earthquake occurrence time. Earthquakes-prone period is from ten days to six months after the exception occurring, which is consistent with previous findings. The overall characterizes of thermal radiation anomaly as follows. 1）The anomalies appeared about a month before the earthquake, and then gradual dissipated after the earthquake and completely disappeared until the end of May. 2 ）The abnormalities characteristic period is 13 days. 3）The maximum amplitude is more than nine times. 4）The relationship between abnormal overall direction and the regional strike of fault is cross-type. 5）The epicenter is located at the transition zone of exception and disappearance. 6）The long-wave radiation anomalies are closer to the epicenter and relatively concentrated, while the brightness temperature anomalies have an advantage in indicating of time, by comparing the brightness temperature and long-wave radiation. These are similarities and differences between pre-earthquake brightness temperature and long-wave radiation. We also study the brightness temperature similarities and differences of thre

关 键 词：玉树7 1级地震 亮温 射出长波辐射 小波变换 相对功率谱 

分 类 号：P315[天文地球—地震学]