Abstract: The temporal and spatial variations of surface latent heat flux(SLHF)and diagnostic air temperature at 2m before and after the M_S 5.7 earthquake that occurred between Ruichang and Jiujiang in Jiangxi province on the 26th November 2005 are summarized in this paper.It is found that before the earthquake significant SLHF anomalies and air temperature anomalies occurred in the epicentral area and its vicinity.The air temperature anomalies are found from the 2nd to 13th November,2005 and concentrated at the epicentral area and its southern area.Then two days later,that is,from the 4th to 15th November 2005,significant SLHF anomalies occurred in the epicentral area and its northern area where a lot of lakes distribute along the active faults.During the anomalous period the SLHF and air temperature at 2m exceeded the sum of 26 years average and 1.5 times of their standard deviation for the same day.Both anomalies had maintained for 12 days with a peculiar distribution associated with the tectonic active zone.It is considered that both of air temperature anomalies and SLHF anomalies are behaviors of thermal flux from underground prior to earthquake.SLHF anomalies occurred over regions with abundant water,whereas air temperature anomalies occurred over land.

Key words: air temperature, surface latent heat flux, earthquake anomaly, Jiujiang earthquake, satellite remote sensing

摘要： 2005年11月26日九江-瑞昌5.7级地震前出现了显著的地表气温异常和潜热通量异常。二者在时间上相关,空间上相邻;既有联系,又有区别。地表气温异常出现于2005年11月2日至13日,主要分布在震中及其南侧,呈NE向展布,与江西北部主要的构造带走向一致。地表气温出现异常2d后,在震中地区及其北侧,沿构造带分布的大片水域及周边地区出现了显著的潜热通量异常,持续时间从11月4日至15日。2种异常的量值都超过了26a的平均值与1.5倍均方差之和,持续时间长,形态孤立,与地质构造相关,有别于气象因素导致的异常。震前气温异常和潜热通量异常都是地震前地下的热量增加导致的不同表现形式,在水体分布较广的区域大多表现为潜热通量异常,而在水体较少的区域则表现为气温异常。

关键词: 九江地震, 潜热通量, 地表气温, 热异常