关键词: 热红外异常, 地球排气, 地震

Abstract: Some researchers believe that satellite thermal infrared anomaly before earthquake is related to gas releasing of the earth. Accordingly,whether the gas releasing phenomena can be observed by satellite thermal infrared remote sensing becomes a key problem. In this paper,two sites where gas releasing phenomena of the Earth occurred assuredly were selected for the study of this key problem. One is the Kaixian County where high pressure and high concentration gas blow-out event of the No.16 oil well took place,and the other is around the epicenter of the west of Kunlunshan Pass M_S8.1 earthquake where gas releasing has been observed to continuously occur along the Kunlunshan Fault even one year after the earthquake. The characteristic features of satellite thermal infrared images before and after gas releasing process have been analyzed,and the thermal infrared anomaly related to gas releasing or gas blow-out has been identified. Furthermore,the feasibility to observe gas releasing phenomena by satellite thermal infrared was discussed. The result shows that the gases blew out from the oil well and the fire from ignited gases are distinctly reflected on satellite thermal infrared images,but the gas releasing phenomena along the Kunlunshan Fault after the M_S8.1 earthquake are poorly displayed on thermal infrared image,so that the infrared thermal anomaly related to gas releasing along this fault is difficult to be recognized by visual interpretation. The comparison of brightness temperature,however,has revealed that the brightness temperature in the gas releasing sites along the fault is higher than that of the surrounding areas either before or after the earthquake.

Key words: thermal infrared anomaly, gas releasing of the earth, earthquake