2010年智利M_S8.8级地震前可能的潜热通量异常及其与地表温度变化的关系  

Probable surface latent heat flux anomalies before the 2010 Chile M_s8.8 earthquake and its relationship to the variations of surface temperature

作　　者：陈梅花[1] 邓志辉[1] 马晓静[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《地球物理学报》2011年第7期1738-1744,共7页Chinese Journal of Geophysics

基　　金：中央公益性研究院所基本科研业务专项(IGCEA1001和IGCEA1124);国家自然科学基金项目(40702056和40841016)资助

摘　　要：本文研究了2010年2月27日智利8.8级地震前后地球表面潜热通量的时空演化过程,并分析了可能的潜热通量异常及其与地表温度变化的关系.结果表明:(1)此次地震及其强余震前出现了三次明显的潜热通量异常,第一次潜热通量异常出现于主震1个月前,主要分布在震中及其东南陆区,第二次潜热通量异常出现在主震前7天,异常区分布在震中西南的海域,呈北西向分布,指向俯冲带,第三次潜热通量异常出现在强余震前,异常区分布在震中西南的海域及北段俯冲带上;(2)相似于2004年印度尼西亚地震海啸前潜热通量的异常演化特征,潜热通量异常从弧后向俯冲带迁移,此次地震前的潜热通量异常首先出现在弧后火山活动强烈地区,然后迁移到海域俯冲带附近,可能反映了临震前的构造变形过程;(3)当陆区出现潜热通量异常时,同时也可见地表温度异常,但在海域出现潜热通量异常时,却未发现有地表温度异常,这可能是由于海域水的热容量较大,不易出现红外温度异常所致.The temporal and spatial variations of surface latent heat flux （SLHF） before and after the Ms8.8 earthquake occurred off the coast of the Maule Region of Chile on 27 February 2010 are summarized and the relationship between the SLHF anomaly and the variation of surface temperature is discussed also. The analysis results show： （1） Three stages of significant SLHF anomalies can be observed before the main earthquake and its aftershocks, the first one occurred one month before the mainshock in the epicentral area and its southeast land area, the second one which distributed northwest towards to the subduction zone occurred one week before the mainshock in the sea of southwest of the epicenter and the third one occurred one week before theaftershocks on 15 March 2010 in the sea of southwest of the epicenter and the northern part of the subduction zone. （2） The anomalies appeared firstly in the back-arc region where the volcanic activities were very intense in recent decades, and then propagated to subduction zone and adjacent sea area, that might be the result of the crust deformation of the subduction zone prior to the earthquake. （3） Surface temperature anomalies were found when the SLHF anomaly occurred on the land region. However, there are not any surface temperature anomalies could be mentioned when the SI.HF anomaly occurred on the sea, which might be due to high heat capacity of water slowing down the temperature increase.

关 键 词：地震异常 潜热通量 地表温度 卫星遥感 智利 

分 类 号：P423[天文地球—大气科学及气象学] P228