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。
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.
出处
《华南地震》
2014年第2期34-40,共7页
South China Journal of Seismology
基金
国家自然科学基金项目(41376061)
关键词
地震
热结构
数值模拟
马尼拉
Earthquake
Thermal structure
Numerical simulation
Manila
