基于NCEP数据的地震热红外遥感逐像元分析方法

Per-pixel Analyzing Method of Earthquake Thermal Infrared Remote Sensing Based on NCEP Data

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.