基于MODIS数据探讨玉树Ms7.1地震前后温度变化
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摘要
以2010年4月14日青海玉树Ms7.1地震为例,用MODIS L1B反演玉树地震短临时期的温度变化。与往年的平均温度相比,在3月20日—4月18日出现比较高的温度,表明地震发生的过程中存在温度异常。从反演的热红外图像中发现,在临震前2～5天,震中处的温度比周围低,结合当地气象资料分析得出:在玉树-甘孜长约50 km的断裂带上,由于刮风下雪,导致雨雪融化流入断层内,形成断层内的温度反而低、周围温度相对偏高的现象。
This article takes the Ms7.1 Yushu earthquake occurred on April 14,2010,in China as an example,the inversion results using MODIS L1B data come to a conclusion:compared with average temperature in the past years there appeared high temperature between March 20,2010 and April 18,2010,there exist temperature anomaly during earthquake.In addition,we have found that the temperature during the earthquake is lower than neighborhod from the retrieved image before the event 2 to 5 day.Through the local meteorological data,we have drawn the conclusion analyzing that,in Ganzi-Yushu fault zone near 50 km,the lower temperature is resulted from that the melting snow heated by thermal energy flow into active fault.
This article takes the Ms7.1 Yushu earthquake occurred on April 14,2010,in China as an example,the inversion results using MODIS L1B data come to a conclusion:compared with average temperature in the past years there appeared high temperature between March 20,2010 and April 18,2010,there exist temperature anomaly during earthquake.In addition,we have found that the temperature during the earthquake is lower than neighborhod from the retrieved image before the event 2 to 5 day.Through the local meteorological data,we have drawn the conclusion analyzing that,in Ganzi-Yushu fault zone near 50 km,the lower temperature is resulted from that the melting snow heated by thermal energy flow into active fault.
引文
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6姜立鹏,覃志豪,谢雯.MODIS数据地表温度反演分裂窗算法的IDL实现[J].测绘与空间地理信息,2006,29(3):114-117.
7毛克彪.用于MODIS数据的地表温度反演方法研究[D].南京大学,2004.
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