The OLR anomaly and mechanism Before Tibet earthquake(M6.9)
强震前地气系统长波辐射（OLR）异常的成因

To the Tibet Ali district M6.9 earthquake occurred on 9/ 01/ 2008, the monthly and daily changing characteristics of satellite remote sensing Outgoing Long-wave Radiation(OLR) messages at west part of China are analyzed in this paper. After researching the relative phenomena in step between the OLR increase and the atmosphere pressure change, it is suggested that the OLR anomaly increasing origination may be in the atmosphere not the ground heat, and the pressure increasing before earthquake may be to induce the M6.9 earthquake occurrence. Certainly, the OLR message is also a important physical element as a indicator of atmosphere trigger earthquake.