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《Acta Seismologica Sinica》 2005-03
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AN EXPERIMENTAL STUDY ON VARIATION OF b VALUE DURING DEFORMATION OF ROCK SAMPLES WITH DIFFERENT STRUCTURAL MODELS

Chen Shunyun Liu Liqiang Ma Shengli Ma Jin (State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China)  
A preliminary study of b value of rocks with two kinds of structural models has been made on the base of a new acoustic emission recording system. It shows that b value of the sample decreases obviously when the sample with compressive en echelon faults changes into a tensile one after interchange occurs between stress axis σ_1 and σ_2. A similar example is observed when the sample with tensile en echelon faults changes into that with a bend fault after two segments of the en echelon fault linking up. These facts indicate that the variation of b value may contain the information of the regional dominant structural model. Therefore, b-value analyses could be a new method for studying regional dominant structural models.
【Fund】: 国家自然科学基金项目(40072067);; 国家“十五”科技攻关项目(2004BA601B01)资助.
【CateGory Index】: P542
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