关键词: 断层现今活动, 遥感技术, 地温, 热红外异常

Abstract: On the basis of previous studies of other researchers, we propose a new approach to detect present-day activities of faults using remote sensing. We have studied the dynamic changes of ground temperature around the epicenter before and after the Mani M_S7.9 earthquake of 1997. It is found that an anomalous increase of ground temperature occurred at the east section of the of Altyn Tagh fault 20 days before the event. Then this anomalous area expanded gradually, formed a remarkable belt which remained till the occurrence of the M_S7.9 earthquake. After the event this belt of anomaly was fading away, while such an anomaly appeared on the seismogenic fault-the Margaichace fault as late as two days before the Mani M_S7.9 event. The evolution process of the image shows that there is some corresponding relationship between the Mani earthquake and evident activity of the Altyn Tagh fault. It also indicates the interaction between the two faults mentioned above as well as the close relation among the deformation anomaly, present-day fault activity and earthquakes. In addition, we propose improvement of the technique for the requirement of the study on present-day activity and interaction of faults.

Key words: Present-day fault activity, Remote sensing, Ground temperature, Thermal infrared anomaly