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则木河断裂带大箐断层枢纽运动的有限元数值模拟研究

DOI: 10.6038/cjg20140710, PP. 2138-2149

Keywords: 枢纽运动,变形局部化,地震成核,数值模拟,大箐梁子,则木河断裂

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Abstract:

变形局部化问题和地震成核问题,是构造变形机制与大地震研究中极其重要的问题.对走滑断裂的运动和走滑型地震而言,断裂枢纽运动是断裂带上变形局部化和地震成核孕育的条件,认识这一运动过程和机制是了解走滑断裂上地震孕育、发生机制的关键之一.本文在前人工作的基础上,以则木河左旋走滑断裂大箐断层为例,测量了大箐断层大箐梁子断头沟台地-五道箐盆地之间的构造和地貌变形,揭示了大箐走滑断层枢纽运动构造和地貌四象限分布的特点,并且在定量分析其枢纽运动的基础上,利用数值模拟方法,模拟了断裂的枢纽运动,结果表明,走滑断裂的枢纽运动表现出典型的掀斜特征,随着断层面倾角的减小,枢纽运动程度加深;随着断层面闭锁区面积的增大,枢纽运动明显受阻;发现在闭锁区及其附近存在一个应力集中区使得应力由外向内一直处于积累状态,反映了地震的成核过程.

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