2010年西藏聂荣M_S5.7和M_S5.5地震前后热红外异常分析

Anomalies of Thermal Infrared Radiation during the 2010 Nierong M_S5.7/M_S5.5 Earthquakes in Tibet

选取2010年3月24日西藏聂荣M_S5.7和M_S5.5地震前后的中国FY-2E静止气象卫星热红外遥感亮温和长波辐射数据,对红外辐射数据采用阈值法进行去云预处理,基于Morlet小波方法计算地震前后的红外辐射功率谱变化,探讨地震前后红外辐射异常演变规律及特征。研究结果显示,西藏聂荣地震前出现了亮温和长波辐射异常增强现象,并且其异常持续时间和主要异常区域基本一致,但亮温的异常幅度大于长波辐射的异常幅度。本研究对于该区域利用热红外遥感数据进行地震研究具有重要的参考价值和意义。

Using thermal infrared Brightness temperature（TBB）and Outgoing long-wave radiation（OLR）data of China FY-2 E meteorological satellite,the anomalies of thermal infrared radiation of the 2010 Nierong M_S5.7 and M_S5.5 Earthquakes in Tibet were studied.This study removed the cloud information of data based on threshold method,calculated the wavelet spectrum change of TBB and OLR based on the Morlet wave method and discussed the regularities and characteristics of its anomalous changes before and after the earthquakes.Obvious TBB and OLR anomalies appear before the Nierong earthquakes.Moreover,durations and locations of the anomalies are similar.However,the abnormal amplitude of TBB is higher than that of OLR.It is significant and valuable in the research of earthquake in this region using the thermal infrared remote sensing data.