根据马尼拉俯冲带的地球物理资料,选取3条典型剖面,模拟马尼拉俯冲板块的热结构,分析俯冲板块的相变过程,探讨马尼拉俯冲带的地震成因机制。结果表明:1)B—B′剖面约在95 km深度时,洋壳开始进入榴辉岩相,C—C′剖面洋壳在160 km进人榴辉岩相;2)马尼拉俯冲带中部的地震活动倾向发生在100 km以上,南部的地震活动分布深度更深;3)马尼拉俯冲带的俯冲板块发生撕裂,使断离以下俯冲板块不容易发生地震活动,影响深源地震的发生。 According to the geophysical data of the Manila subduction zone, three typical sections are selected to simulate the thermal structure of the Manila subduction plate, analyze the phase transformation process of the subducted slab, and explore the earthquake cause mechanism of the Manila subduction zone. The results show that: 1) when the B-B ’profile is about 95 km deep, the oceanic crust begins to enter the eclogite facies and the C-C’ oceanic crust enters the eclogite facies at 160 km; 2) The seismic activity tendency occurs above 100 km, and the distribution of seismic activity in the south is deeper. 3) The subduction zone in the Manila subduction zone is torn so that the subduction zone below the fault is not prone to seismic activity, which will affect the occurrence of deep-seated earthquake.