中国大陆几次强地震活动的卫星红外异常分析  

SATELLITE INFRARED ANOMALY OF SEVERAL STRONG EARTHQUAKES IN CHINA MAINLAND

作　　者：邓志辉[1] 王煜[1] 陈梅花[1] 唐方头[1] 楚全芝[1] 徐好民[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《地震地质》2003年第2期327-337,共11页Seismology and Geology

基　　金：国家自然科学基金 (4 0 14 2 0 10 );国家重点基础研究发展规划项目 (95 130 5 0 3);中国地震局跨世纪人才培养项目;中国地震局地质研究所所长基金共同资助。

摘　　要：通过对 2 0 0 0年在中国大陆发生的 3个 6级以上地震的卫星红外异常特征的初步分析 ,得到了一些有意义的结果 :1)卫星红外异常的分布与地质构造 ,特别是活动断裂的关系密切 ;2 )地震震中常位于红外温度的相对高值异常的边缘或附近 ,异常的发展具有非对称性 ,异常一般都是从震中附近的某一侧向震中区扩展 ;3)红外异常的时空分布规律在不同的地区是不同的 ,异常信息的提取要结合具体的构造条件、地理环境和气象因素进行分析。This paper is aimed at the relationship between satellite infrared anomaly and tectonic activities by analysis of anomaly images of 3 earthquake cases ( M >6) occurred in 2000 in China. Yao'an earthquake ( M S 6.5) occurred on January 15, 2000 in Yunnan Province, southwest China. The infrared anomaly of the earthquake began 20 days before the mainshock and disappeared after the event. It developed along the Honghe Fault, which is the most important fault near the epicenter. The brightness temperature along the fault is always higher than that away from the fault during the anomalous period. The anomaly of temperature difference along the fault and away from the fault exists not only when weather temperature increases but also when it falls down. It seems that the anomaly is more active along the fault than in the other area. Jingtai earthquake ( M L 6.2) occurred on June 6, 2000 in Gansu Province, northwest China. Satellite Infrared anomaly appeared in a peculiar geometrical pattern before the earthquake. The monthly average infrared brightness temperature increased abnormally along 3 NE trending tectonics which intersect with the NW trending faults. Near the epicenter, the infrared anomaly developed in 'Z' configuration that seems to extend along conjugated structures. Xinghai earthquake ( M S 6.6) took place on Sept. 12, 2000 in east Qinghai Province, northwest China. The epicenter is located near the NNW trending Ngola Shan Fault. Before the earthquake, the monthly average infrared brightness temperature was different on both sides of the Ngola Shan Fault and its extension. It was higher than 10℃ on the eastern side, and less then 10℃ on the western side. From the above mentioned 3 cases, the primary conclusions can be drawn as fellows: (1) The distribution of satellite infrared anomaly is closely related to geologic structures, especially active faults; (2) The earthquake epicenter is often located at the margin of relatively high infrared temperature anomaly area or its vicinity. I

关 键 词：中国大陆 强地震活动 卫星红外异常 地质构造 活动断裂 时空分布 姚安地震 景泰地震 兴海地震 

分 类 号：P315.72[天文地球—地震学] P315.2[天文地球—固体地球物理学]