基于NCEP数据的地震热红外遥感逐像元分析方法
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摘要
提出一种以各像元为基本单位、顾及不同地形单元下垫面属性差异、分析震前地表等压面温度变化的逐像元方法。对比分析了2008年3月21日中国西部于田MS7.2地震前的热异常时空演化特征及其与现有方法分析结果的差异,并以2001年11月14日的中国西部昆仑山MS8.1地震为例进行了验证。结果表明所得红外异常与中国西部孕震区活动构造的空间关联较好。基于NCEP的逐像元分析方法是有效的,为揭示孕震过程尤其是临震前区域构造活动提供了新的途径。
This paper presents a per-pixel method,which takes each pixel as a basic unit and considers the underlying property difference in different topographic units to analyze the variation of temperature at ground isobaric surface.By using the per-pixel method based on NCEP data,the thermal anomaly variation before the 21 march 2008 Yutian MS7.2 earthquake,west China,was compared with the results by existing method;and,the 14 Nov.2001 Kunlunshan MS8.1 earthquake,west China,is applied to verify the method.The results show that the thermal anomaly of the per-pixel method has the good spatial relations with the regional active structures.The per-pixel method based on NCEP data is effective,and it provides a solution to reveal the regional tectonic activities during earthquake preparation,especially in the process of earthquake impending.
This paper presents a per-pixel method,which takes each pixel as a basic unit and considers the underlying property difference in different topographic units to analyze the variation of temperature at ground isobaric surface.By using the per-pixel method based on NCEP data,the thermal anomaly variation before the 21 march 2008 Yutian MS7.2 earthquake,west China,was compared with the results by existing method;and,the 14 Nov.2001 Kunlunshan MS8.1 earthquake,west China,is applied to verify the method.The results show that the thermal anomaly of the per-pixel method has the good spatial relations with the regional active structures.The per-pixel method based on NCEP data is effective,and it provides a solution to reveal the regional tectonic activities during earthquake preparation,especially in the process of earthquake impending.
引文
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[2]强祖基,赁常恭,李玲芝,等.卫星热红外图像亮温异常—临震前兆[J].中国科学(D辑),1998,28(6):564-573.
[3]徐秀登.台湾南投7.6级地震前卫星红外异常[J].地震学报,2000,22(6):666-669.
[4]Saraf AK,Choudhury S.Satellite detects surface thermal anomalies associated with the Algerian earthquakes of May 2003[J].International Journal of Remote Sensing,2004(26):2705-2713.
[5]Ouzounov D,Bryant N,Logan T,Pulinets S,Taylor P.Satellite thermal IR phenomena associated with some of the majorearthquakes in 1999-2003[J].Physics and Chemistry of the Earth,2006(31):154-163.(下转第45页)
[6]刘善军,吴立新,李金平,等.台湾恒春地震前的卫星热红外异常特征及其机理[J].科技导报,2007(06):32-37.
[7]张元生,郭晓,钟美娇,等.汶川地震卫星热红外亮温变化[J].科学通报,2010,55(10):904-910.
[8]马未宇.汶川地震前的NCEP异常现象[J].科技导报,2008,26(10):36-38.
[9]秦凯,王斌,郭广猛,等.使用NCEP数据分析新疆于田地震前异常增温[J].吉林大学学报(地球科学版),2008(6):110-116.
[10]王想,张元生,郭晓.利用FY-2C资料研究于田7.4级地震前的红外增温异常[J].内陆地震,2009,23(3):345-350.
[11]郭卫英.青藏高原北部主要断裂的卫星热红外影像特征的研究[D].北京:中国地震局地球物理研究所,2004.
[12]吴立新,刘善军,吴育华.遥感-岩石力学引论——岩石受力灾变的红外遥感[M].北京:科学出版社,2006.
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