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与地震有关的活动断裂带红外辐射变化特征

DOI: 10.6046/gtzyyg.2013.01.10, PP. 56-60

Keywords: 玉树地震,红外辐射,活动断裂

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Abstract:

为了获得与地震有关的活动断裂带红外辐射变化信息,以2010年4月14日青海省玉树Ms7.1级地震为研究对象,利用MODIS热红外波段遥感数据研究了地震前后发震构造甘孜—玉树断裂带的亮温演化特征,分析了地震发生当月每10d亮温变化情况,并与2011年同期该断裂带的亮温特征进行对比。结果表明:地震前一个月内,断裂带附近亮温值偏高,亮温变化最为显著的区域出现在断裂带北端,与野外考察获得的本次地震地表破裂带位置相吻合;震后7~16d,断裂带附近出现了明显的亮温增高现象,结合地震发生时水汽及CO变化情况,认为这一亮温增高现象与震后地下气体的大量释放有关;2011年5月断裂带附近的亮温高值可能与同年6月发生的Ms5.3级囊谦地震有关。因此认为,断裂带亮温的显著变化对断裂活动有一定指示作用,利用热红外遥感数据研究主要断裂带红外辐射特征,对地震构造带活动性监测具有重要意义。

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