星载微波辐射计对玉树地震岩石破裂辐射异常的初步检测

A Preliminary Detection of Anomalous Radiation of Rock Failures Related with Yushu Earthquake by Using Satellite-borne Microwave Radiometers

实验发现岩石挤压破裂会在特定微波频段辐射能量增强。根据星载微波辐射计AMSR-E2003年至2010年4月中上旬8 a的辐射亮度温度(Tb)数据,提出辐射异常指数RAI,检测地震岩石挤压破裂产生的微波能量辐射异常。利用大气辐射传输模型,分析地表物理温度和大气水汽含量等变化对于检测RAI的影响。对2010年4月12日(2010年4月14日玉树地震发生前两日)的Tb数据作RAI分析,RAI异常的检测区域与地震主断裂带分布有明显的空间相关性。

Some experiments demonstrated anomalous enhancement of microwave radiation at certain frequencies during rock compression and cracking.In this paper,multiple channels brightness temperature（Tb） data observed by AMSR-E during eight years（2003~2010） in each April are collected.The radiation anomaly index,RAI,is defined from Tb data to detect anomalous microwave radiation.based on atmospheric radiative transfer,emission variations due to physical temperature of land surface and atmospheric water vapor are analyzed in RAI detection.The RAI detection of Yushu area in April 12,2010（two days before the earthquake in April 14,2010） is obtained,and its anomaly shows good spatial correlation with main seismic bands.