张北6.2级地震前的卫星热红外异常

SATELLITE THERMAL INFRARED ANOMALY BEFORE THE ZHANGBEI EARTHQUAKE MS=6.2

利用张北地震前 1个月华北北部 (37～ 42°N,1 1 3～ 1 1 9°E)的气象卫星 NOAA/ AVHRR热红外遥感资料 ,提取震前热红外温度异常 ,研究其时空变化的过程和特征 ,并对热红外温度异常与地震的关系进行初步的探讨。结果表明 ,在张北地震前 1 3天沿张家口 -渤海断裂带确有显著的热红外温度异常出现。异常区域呈条带状 ,且与 NW向地质构造一致 ;温度异常的动态变化可大致分为初始、平缓发展和临震加速 3个阶段。

By using the meteorological satellite NOAA/ AVHRR thermal infrared remote sensing data from the northern China( 37～ 4 2°N,1 1 3～ 1 1 9°E) one month before the Zhangbei earthquake,the authors extracted the thermal infrared temperature anomaly,studied the process and features of its temporal and spatial variation,and made a preliminary discus- sion on the relationship between the earthquake and the thermal infrared temperature anomaly.The results show that distinguishable thermal infrared temperature anomaly oc- curred along the Zhangjiakou-Bohai Sea fault zone1 3days before the earthquake.The anomaly is strip in shape and accords with the NW-striking geological tectonics;the pro- cess ofits variation can be approximately divided into three stages:initialization,stable in- crease and acceleration.The thermal infrared temperature anomaly is used as an impend- ing precursor and implies the probability of the occurrence of a strong earthquake.