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THE FINITE ELEMENT ANALYSIS OF THE INTERACTION BETWEEN CONJUGATE SEISMOGENIC STRUCTURES

Yang Shisheng, Qin Baoyan (Earthquake Research Instittde of Lanzhou, SSB, China  
On the basis of the combination model of source, the interaction between conjugate seismogenic structures is calculated and modeled by using the finite element method. It gives the results as fol lows: 1. The single main shock type. One fault, moves and the other fault does not move, so the single main shock type is formed when the internal angle region of conjugate faults is located in compressive stress region and there exists the adjustment unit of adequate size in the intersection region of Conju gate faults. 2. The conjugate single main shock type. Two conjugate faults join together and a great earth quake occurres when the internal angle region of conjugate faults is locared in. tensile stress region and there is not the adjustment unit or the adjustment unit is little enough. 3. The double main shock type. The double main shock type is usually formed when the inter nal angle region of conjugate faults is located.in tensile stress region and there exists the adjustment u nit of adequate size in the intersection region of conjugate faults ,the smaller the adjustment unit in the intersection region of conjugate faults is ,the shorter the time interval between two major shocks is. Furthermore , this paper also calculates and discusses the relation between the adjustment unit size and the location of initial fracture region in conjugate faults.
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