Wavelet analysis of thermal infrared radiation of land surface and its implication in the study of current tectonic activities
地表热红外辐射的小波分析及其在现今构造活动研究中的意义

Thermal infrared radiation of land surface(TIRLS) is influenced by many factors such as tectonic activity,atmosphere,solar radiation,plant and so on.How to exclude the non-tectonic information is a key problem before TIRLS is applied to study tectonic activity or earthquake activity.As for frequency domain,TIRLS includes mainly 3 frequency bands:(1)high frequency band with period less than 1 year,which is relative to weather;(2)mid frequency band with predominant period 1 year,relative to sun,plant and season;(3)low frequency band with period more than 1 year,relative to the crustal activity and long period variation of atmosphere temperature.In this paper,TIRLS is decomposed into 3 exclusive frequency bands mentioned above by wavelet method.Compared with weather data and earthquake activity,our result shows that thermal abnormality of low frequency part of TIRLS is resulted most possibly from fault activity and could offer a certain indictor for judging current tectonic activity or earthquake.The high temperature abnormality area(or belt) of low frequency part of TIRLS is likely to attributed to the current tectonic activity and earthquake.