| 地热与地震关系的研究(二)——温度梯度对走滑断层破裂扩展的影响 |
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| 引用本文： | 安镇文,朱传镇.地热与地震关系的研究(二)——温度梯度对走滑断层破裂扩展的影响[J].地震学报,1986,8(4):382-392. |
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| 作者姓名： | 安镇文 朱传镇 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 将震源考虑为弹性介质中的椭圆盘状断裂面, 从理论上分析了剪切力平行于椭圆长轴作用下, 同时考虑断裂面内存在一定温度梯度时的破裂扩展特征.分析结果表明:除长轴端点附近形成偏离主断裂面80左右的扩展分支外, 在主断裂面中间部位, 包括短轴端点, 亦出现非共面的破裂扩展.其扩展区域范围与主断裂面的纵横比及温度梯度的大小有关.据此, 较好地解释了唐山、海城和龙陵地震的余震分布图象.
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STUDY OF GEOTHERMAL VARIATION IN RELATION TO LARGE EARTHQUAKES(2)THE EFFECT OF TEMPERATURE GRADIENT ON FRACTURE PROPAGATION DIRECTION FOR STRIKE-SLIP FAULT |
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| Institution: | Institute of Geophysics, Slate Seismological Bureau |
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| Abstract: | Considering a fault of elliptical-shaped crack along which exists a uniform thermal gradi-eni. The characteristics of the direction of fracture propagation of such a crack have been analysed theoretically under uniform shear loads whose direction parallels with that of the major axis of the ellipse. The results indicate that besides the fracture branches occurring in small regions near both ends of the major axis of the crack and making an angle of about 80 with the fracture plane, non-coplanar fracture branches also appear in the middle part of the major axis and at the ends of the minor axis. The extension range oi the fracture branches is related with the aspect ratio of the crack and the thermal gradient etc.On the basis of this model, the aftershock distributions of the Tangshan, Haicheng and Lon-gling earthquakes are well explained. |
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