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
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摘要
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.
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.
引文
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[12]Takashi M,Tadashi T.Discrimination of Local and Gaint C-hanges from Datellite-borne Microwave-radiometer Data[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(9):2684-2691.
[2]Tadashi T,Takashi M.Experiment and Theoretical Study ofEarthquake Detection Capability by Means of Microwave Pas-sive Sensors on a Satellite[J].IEEE Geoscience and RemoteSensing Letters,2009,6(1):107-111.
[3]Wu Lixin,Liu Shanjun,Wu Yuhua.Introduction of RemoteSensing-Rock Mechanics[M].Beijing:Science Press,2006.[吴立新,刘善军,吴育华.遥感—岩石力学引论[M].北京:科学出版社,2006.]
[4]Jin Y Q,Wang D.Automatic Detection of Terrain SurfaceChanges after Wenchuan Earthquake,May 2008,from ALOSSAR Images Using 2EM-MRF Method[J].IEEE Geoscienceand Remote Sensing Letters,2008,6(2):344-348.
[5]Takashi M,Tadashi T.Detection Algorithm of Earthquake-related Rock Failures from Satellite-borne Microwave Radi-ometer Data[J].IEEE Transactions on Geoscience and Re-mote Sensing,2010,48(4):1768-1776.
[6]Kawanishi T,Sezai T,Ito Y,et al.The Advanced MicrowaveScanning Radiometer for the Earth Observing System(AM-SR-E),NASDA s Contribution to the EOS for Global Energyand Water Cycle Studies[J].IEEE Transactions on Geosci-ence and Remote Sensing,2003,41(2):184-194.
[7]Jin Yaqiu.Remote Sensing Theory of Electromagnetic Scat-tering and Thermal Emission[M].Beijing:Science Press,1993.[金亚秋.电磁散射和热辐射的遥感理论[M].(2009第三次印刷),北京:科学出版社,1993.]
[8]Rosenkranz P W.Shape of the 5 mm Oxygen Band in the At-mosphere[J].IEEE Transactions on Antennas and Propaga-tion,1975,23(4):498-506.
[9]Rosenkranz P W.Interference Coefficient for Overlapping Ox-ygen Lines in Air[J].Journal of Quantitative Spectroscopyand Radiative Transfer,1988,39(4):287-297.
[10]Deng Qidong,Ran Yongkang,Yang Xiaoping.Terrain Struc-ture of China[M].Beijing:Sesmic Press,2007.[邓起东,冉勇康,杨晓平.中国活动构造图[M].北京:地震出版社,2007.]
[11]Ministry of Land and Resources of the People s Republic ofChina.Macroscopic Epicenter of Yushu Earthquake is Basical-ly Figured out by the Panel of Ministry of Land and Resourcesof the People s Republic of China[EB/OL].http://www.mlr.gov.cn/xwdt/jrxw/201004/t20100421_146223.htm,2010-04-21.[中华人民共和国国土资源部.部专家组基本确定玉树地震宏观震中[EB/OL].http://www.mlr.gov.cn/xwdt/jrxw/201004/t20100421_146223.htm,2010-04-21.]
[12]Takashi M,Tadashi T.Discrimination of Local and Gaint C-hanges from Datellite-borne Microwave-radiometer Data[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(9):2684-2691.
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