Surface latent heat flux anomalies prior to the Indonesia Mw9.0 ear thquakeof 2004  

作　　者：CHEN Meihua DENG Zhihui YANG Zhuzhuan MA Xiaojing 

机构地区：[1]Institute of Geology, China Earthquake Administration, Beijing 100029,China

出　　处：《Chinese Science Bulletin》2006年第8期1010-1013,共4页

基　　金：supported by the National Natural Science Foundation of China(Grant No.40372131);the Key Projects Required by National 10th Five-year Plan(Grant No.2004BA601B01-02-02);the National High-tech"863"Project(Grant No.2003AA134060).

摘　　要：The temporal and spatial variations of surface latent heat flux (SLHF) before and after the Mw9.0 earthquake that occurred on the west coast of Sumatra, Indonesia on 26 December 2004 are summarized. It is found that before the earthquake significant SLHF anomalies occurred at the epicentral area and its vicinity. The largest SLHF anomaly oc- curred on the subduction zone in the middle part of Burma micro-plate, where the middle part of the rup- ture zone is located and the aftershocks are concen- trated. The developments of the anomaly involved growing of the anomaly from small to large and spreading of the anomaly from disordered to con- centrated. The anomaly began to occur on the east extensional boundary of the Burma micro-plate and its adjacent oceanic basin, and then propagated to the west compressive boundary, where the subduc- tion zone exists. Finally, the anomaly disappeared after the main shock. The seismic source is consid- ered to be a dissipation system. The increase of stress prior to an earthquake may enhance the ex- change of energy and material between the seismic source system and the outer system, resulting in the increase of the rate of energy exchange between sea surface and atmosphere, which is believed to be the main reason of the generation of SLHF anomaly.The temporal and spatial variations of surface latent heat flux （SLHF） before and after the Mw9.0 earthquake that occurred on the west coast of Sumatra, Indonesia on 26 December 2004 are summarized. It is found that before the earthquake significant SLH F anomalies occurred at the epicentral area and its vicinity. The largest SLHF anomaly occurred on the subduction zone in the middle part of Burma micro-plate, where the middle part of the rupture zone is located and the aftershocks are concentrated. The developments of the anomaly involved growing of the anomaly from small to large and spreading of the anomaly from disordered to concentrated. The anomaly began to occur on the east extensional boundary of the Burma micro-plate and its adjacent oceanic basin, and then propagated to the west compressive boundary, where the subduction zone exists. Finally, the anomaly disappeared after the main shock. The seismic source is considered to be a dissipation system. The increase of stress prior to an earthquake may enhance the exchange of energy and material between the seismic source system and the outer system, resulting in the increase of the rate of energy exchange between sea surface and atmosphere, which is believed to be the main reason of the generation of SLHF anomaly.

关 键 词：表面潜热流 地震异常 SLHF 印度尼西亚 海啸 卫星遥感测量 

分 类 号：P731.25[天文地球—海洋科学] P315