| 马尼拉俯冲带热结构数值模拟与地震意义 |
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| 引用本文： | 陈爱华,许鹤华.马尼拉俯冲带热结构数值模拟与地震意义[J].华南地震,2014(2):34-40. |
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| 作者姓名： | 陈爱华 许鹤华 |
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| 作者单位： | 国土资源部海底矿产资源重点实验室广州海洋地质调查局;中国科学院边缘海地质重点实验室中国科学院南海海洋研究所; |
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| 基金项目： | 国家自然科学基金项目(41376061) |
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| 摘 要： | 研究马尼拉俯冲带地震分布的成因机制,根据马尼拉俯冲带最新的莫霍面深度和地壳厚度等地质与地球物理资料,选取3条典型剖面,模拟俯冲带热结构。结果表明:1俯冲带热结构主要受俯冲角度、俯冲速度和俯冲板块本身地质条件等因素影响;2 BB′剖面和CC′剖面属于热俯冲;3当洋壳俯冲至软流圈边界时,俯冲板块温度迅速升高,容易形成地震活动。BB′剖面的俯冲角度和俯冲速度比CC′剖面小,使得BB′剖面发生地震的深度更浅。俯冲洋壳底部温度比顶部低,地震活动也持续到更大的深度。
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| 关 键 词： | 地震 热结构 数值模拟 马尼拉 |
Thermal Structure Numerical Simulation and Its Earthquake Significance of Manila Subduction Zone |
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| Institution: | CHEN Aihua, XU Hehua (1. Guangzhou Marine Geology Survey, Guangzhou 510760, China; 2. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China) |
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| Abstract: | In order to study the formation mechanism of the manila subduction zone earthquakes distribution,based on the latest Moho depth and crustal thickness and other geological and geophysical dates, three typical cross-sections, this paper simulated thermal structure of subduction zones. The results show that： 1 thermal structure of subduction zone is mainly affected by subduction angle, velocity and geological conditions of the plate itself; 2 BB′ and CC′ are warm subduction; 3 When the ocean crust arrive the asthenosphere boundary, the plate temperature rises rapidly, forming dense earthquakes. BB′ have a shallower earthquake because of the smaller subduction angles and velocity. Subducted oceanic crust temperature at the bottom is lower than the top, earthquakes have continued to greater depth. |
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| Keywords: | Earthquake Thermal structure Numerical simulation Manila |
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