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An experimental study on variation of thermal fields during the deformation of a compressive en echelon fault set

Progress in Natural Science:Materials International 2007年第3期17卷 298-304页

作者： LIU Peixun, MA Jin, LIU Liqiang, MA Shengli and CHEN Guoqiang (Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China) Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China

The temperature variations during deformation of a compressive en echelon fault set in a rock sample were measured by a surface measurement system with multi-point platinum resistance thermometers and an infrared thermal image system. The measurements obtained by the two systems were in agreement with each other, indicating a relationship between temporal-spatial variations of the thermal field and changes of stress and strain. At varied structural positions of the rock sample, the rising of the temperature was different, implying distinct stress distributions at these positions. In the experiment, the deformation process of the sample included three stages: elastic deformation, stick-slip, and rupture. Correspondingly, the variation process of temperature had also three stages, each of which had its own temperature rising profile. And the thermal radiation field showed a similar process. These phenomena mean that the dominant mechanisms of temperature rising in all stages of deformation are different. Experimental results provide a physical basis for the study of current fault activities by using data of satellite infrared images.

关键词： en echelon fault set stick-slip thermal infrared radiation temperature mechanism of temperatnre rising.

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