| 成层非均匀地壳中应变能密度场时空分布的动态模拟研究. |
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| 引用本文： | 陈宇坤 聂永安. 2000: 成层非均匀地壳中应变能密度场时空分布的动态模拟研究.. 地震学报, 22(6): 596-605. |
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| 作者姓名： | 陈宇坤 聂永安 |
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| 作者单位： | （中国天津300201天津市地震局） |
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| 基金项目： | 中国地震局“九五”重点项目!( 95-0 4 -0 3-0 1 -0 3)，天津市地震局中青年基金 |
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| 摘 要： | 通过对坚固体孕震模型应变能密度场动态变化的模拟研究，对地震孕育过程、初始破裂、始裂条件和破裂的传播方向等问题取得了进一步的认识．结果表明：孕震过程初期，软弱体部位应变能密度水平很高，但在孕震过程后期，其应变能密度增量水平变小，坚固体及其与直立断层交汇部位的应变能密度增量迅速变大，成为应变能密度增量最大的地方，从而使弹性模量比较大的坚固体与直立断层交汇处成为最先破裂发震的部位．破裂在直立断层端部的坚固体内沿着与断层成近于直交的方向传播，这样，理论上确定的破裂方向与实际计算的破裂方向得到了很好的统一．
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| 关 键 词： | 坚固体孕震模式 坚固体 软弱体 能量释放率 应变能密度因子 破裂方向 |
DYNAMIC SIMULATION FOR TEMPO-SPATIAL DISTRIBUTION OF STRAIN ENERGY DENSITY IN INHOMOGENEOUS STRATIFIED CRUST |
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| Chen Yukun,Nie Yongan. DYNAMIC SIMULATION FOR TEMPO-SPATIAL DISTRIBUTION OF STRAIN ENERGY DENSITY IN INHOMOGENEOUS STRATIFIED CRUST[J]. Acta Seismologica Sinica, 2000, 22(6): 596-605 |
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| Authors: | Chen Yukun Nie Yongan |
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| Abstract: | Through simulating research on dynamic variations of strain energy density (SED) in seismogenic model with hard inclusion, the authors have gained further knowledge to such problems as the process of earthquake preparation, initial rupture, conditions of the initial rupture and fracture spreading direction etc. Results of the research show that SED (strain energy density) in soft inclusion is very high during the initial period of earthquake preparation and the increment of SED in the soft area decreases at the latter stage of the process. Meanwhile, the increment increases quickly in hard inclusion and the intersection zone of the inclusion with a erecting fault, where the increment of SED is maximum. Thus, the intersection zone between hard inclusion with larger elasticity modulus and erecting fault becomes the place where the initial rupture or earthquake occur. The fracture in the end part of the hard inclusion spreads along a direction nearly vertical to the erecting fault, so the theoretic fracture direction is consistent with that calculated by digital simulation. |
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| Keywords: | hard inclusion seismogenic model hard inclusion soft inclusion energy releasing rate factor of SED rupturing direction |
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