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Abstract To study the infrared anomaly features of tectonic activity and process of instability，the tortuously non-connected fault is selected as a physical simulation model，and the thermal infrared radiation(TIR) variation features of fault models are experimentally studied in the process of loading and instability by means of uniaxial loading system and TIR imaging system. It is revealed that：(1) with the stress increases periodically，a high-temperature anomaly point firstly appeared at the lower fault，and the temperature of the point gradually increases. When the fault is close to destabilization，two new high-temperature anomaly points appear alternately at the end of the rock bridge，and finally become a hot strip. Then two faults connect and are destabilized. There is a causality of the infrared radiation(IRR) anomaly feature of three high-temperature points and alternating evolution with the pre-sliding of fault，the stress concentration in the region of rock bridge and migration；(2) the average infrared radiation temperature(AIRT) of rock bridge region shows three-stage variation features manifested as AIRT is hardly changed at the low-stress stage，then increased slowly at the middle-stress stage and increased quickly at the instability stage. The rapid rise of AIRT after a short drop is an important precursor of fracture and instability；and (3) the difference of infrared radiation variation in different position is closely related to the stress property of different position. The united earth observation of multi-parameters，such as stress，strain and infrared radiation etc.，would be the key of analysis on tectonic activity and its disaster in the future.
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Received: 14 July 2008
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