汶川M_S8.0地震前地表潜热通量异常

Abnormal Surface Latent Heat Flux Prior to the Wenchuan M_S8.0 Earthquake

本文处理了汶川MS8.0大地震前后部分地表潜热通量(SLHF)数据,发现SLHF异常信息出现在地震前7天。SLHF异常时间上经历弱—强—弱变化过程,地震发生在强异常时段,异常两个高值点出现在活动断层较为发育的应力低值区,地震发生后,异常信息很快衰减。SLHF异常随时间有沿发震断裂带走向运移的规律。震前7天的综合SLHF异常主要分布在龙门山断裂带及周围地区,震中位于异常区的中心位置。

In this paper,surface latent heat flux（SLHF）data is processed and analyzed before the Wenchuan MS8.0 earthquake.According to the results,SLHF abnormity appears in local area 7 days before the earthquake.The abnormity information shows weak initially and then becomes strong gradually and becomes weak eventually.SLHF abnormity is very strong when the main earthquake takes place.There are two high SLHF value points which appear in relative low stress area with developed active faults.SLHF abnormity becomes weak quickly after the main shock.SLHF abnormity area migrates with time along main focus faults.7 days＇ synthetic SLHF abnormity area covers around Longmenshan Faults and the epicenter of the main shock locates in the center of the abnormity area.