| 双地震带的影响因素探讨 |
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| 引用本文： | 张克亮,魏东平.双地震带的影响因素探讨[J].地球物理学报,2011,54(11):2838-2850. |
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| 作者姓名： | 张克亮 魏东平 |
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| 作者单位： | 1. 中国地震局地质研究所 地震动力学国家重点实验室,北京 100029;
2. 中国科学院研究生院地球科学学院,北京 100049;
3. 中国科学院计算地球动力学重点实验室,北京 100049 |
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| 基金项目： | 国家自然科学基金项目(40874047,40574047)资助. |
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| 摘 要： | 讨论了全球39个俯冲带内的双地震带层间距、应力类型与俯冲参数的相互关系,这些俯冲参数包括动力学参数(板块年龄、热参数、板片拉力)、运动学参数(俯冲板块速度、上覆板块运动速度、海沟迁移速度、弧后形变特征)、几何形态参数(浅俯冲角、深俯冲角、俯冲深度、长度)及上覆板块性质等.结果表明:(1)I型双地震带易形成于年龄较古老(...
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| 关 键 词： | 俯冲带 双地震带 板块年龄 层间距 俯冲参数 |
| 收稿时间： | 2011-01-04 |
On the influence factors of double seismic zones |
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| ZHANG Ke-Liang,WEI Dong-Ping.On the influence factors of double seismic zones[J].Chinese Journal of Geophysics,2011,54(11):2838-2850. |
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| Authors: | ZHANG Ke-Liang WEI Dong-Ping |
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| Institution: | 1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. College of Earth Science, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The correlations among the layer separation, stress pattern of 39 Double Seismic Zones (DSZs) and subduction parameters have been analyzed. Subduction parameters include dynamic (e.g., plate age, thermal parameter, slab pull), kinematic (e.g., subduction plate velocity, overriding plate velocity, trench migration velocity, back-arc deformation pattern), geometric (e.g., shallow dip angle, deep dip angle, subduction length, subduction depth) and the nature of overriding plate. The preliminary results indicated that (i) Type I DSZs are likely to exist in older (>60 Ma) slabs and, the layer separation is correlated with dynamic parameters such as plate age, thermal parameter and slab pull; whereas (ii) Type II DSZs are detected mostly in younger (<60 Ma) slabs and, the features are controlled not only by dynamic factors but also local stress regime; (iii) Type I DSZs exist in slabs with thermal parameter greater than 5000 km, whereas both Type I and II DSZs exist in slabs with thermal parameter less than 5000 km; (iv) the nature of the upper plate seems to be a controlling factor on the limit of the layer separation, which is 20 km for continental plates while 15 km for oceanic ones. Constrained by the observational condition, the inference from our results based on limited samples need validation from more observations as well as numerical simulations. |
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| Keywords: | Subduction zone Double seismic zones Plate age Layer separation Subducting parameter |
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