关键词: 卫星遥感, 红外异常, 活动断裂, 姚安地震, 玛尼地震

Abstract: The Yaoan M_S 6.5 earthquake on Jan.15,2000 and Mani M_S 7.5 earthquake on Nov.8,1997 are taken as cases to study the temporal process of the satellite infrared anomalies on the active faults near the epicenter.The inside-outside temperature relation analysis method(IOTRAM)was used in the middle segment of the Red River Fault.The result shows that the inside temperature is about 0～1.5℃ higher than the outside temperature in the normal periods.But the brightness temperature inside the Red River Fault is 2～3℃ higher than that outside the fault 15 days before the Yaoan M_S 6.5 earthquake on Jan.15,2000.The Mani M_S 7.5 earthquake occurred on Nov.8,1997 in northern Qingzang-Tibetan plateau.Curves of the average brightness temperature in the east section of the Margaichaca fault belt and the difference inside and outside the region of the fault belt in 1996,1997 and 1998 were contrasted.The result shows that temperature difference in Oct.and Nov.in 1997 was2～3℃ higher than that in 1996 and 1998,though the inside temperature in the same term in 1997 was the lowest in the three years because of a heavy snow.It returned to normal after earthquake.IOTRAM was used to study the active faults in Huabei and Chuandian regions where less earthquakes have occurred recently and no infrared anomalies appeared.

Key words: satellite remote sensing, infrared anomaly, active fault, the Yaoan M_S 6.5 earthquake, the Mani M_S 7.5 earthquake