The thermal structure below the southern Mexican subduction zone: Implications for slab metamorphism and earthquakes

The data includes the three-dimensional temperature field (degrees Celsius), water content (wt%), dehydration rate (wt%/km), rock phase change distribution, and subduction velocity field (cm/yr) of the subducting plate, as well as the coastline and volcano distribution. The data coordinates are an orthogonal coordinate system. The geometry of the subducted plate is well constrained by Slab2, and the plate ages are provided by EarthByte. The temperature boundary condition agrees with the plate cooling model. The bottom of the slab and the perpendicular plane are prescribed as adiabatic and permeable, and the top surface is set to a fixed temperature (0°C) and is rigid. The data was acquired through 3-D numerical thermal modeling which was developed from originally code stag3d. An anelastic liquid approximation and the equations of conservation of mass, momentum, and energy are used in this model. Based on a three-dimensional thermomechanical model and the collect earthquake catalog from IRIS, the data of the slab thermal state, water content, and slab dehydration distribution in Vanuatu are calculated. The geophysical calculation is ensured after the subduction thermal regime reaches a steady state. The temperature field error range is ±50 degrees Celsius, and the velocity field error range is ±0.1cm/ yr. This data can be further used analyzing the geophysical field of subduction zone.本数据集包含俯冲板块的三维温度场（单位：摄氏度）、含水量（重量百分比，wt%）、脱水速率（重量百分比/公里，wt%/km）、岩石相变分布，以及俯冲速度场（单位：厘米/年，cm/yr），同时涵盖海岸线与火山分布数据。数据集采用正交坐标系进行坐标标定。俯冲板块的几何形态由Slab2模型严格约束，板块年龄数据由EarthByte提供。温度边界条件与板块冷却模型相一致。俯冲板片底部与垂直平面被设定为绝热且透水的边界条件，而上表面则被设置为固定温度（0摄氏度）且刚性的边界。本数据集通过三维数值热模拟实验获取，该模拟基于原始代码stag3d开发而来。该模拟采用非弹性流体近似（anelastic liquid approximation），并使用了质量、动量与能量守恒方程。本数据集基于三维热力学模型，结合IRIS收录的地震目录，对瓦努阿图地区的俯冲板片热状态、含水量以及脱水分布数据进行了计算。所有地球物理计算均在俯冲热系统达到稳态后完成，以保障计算有效性。温度场的误差范围为±50摄氏度，速度场的误差范围为±0.1厘米/年。本数据集可进一步用于俯冲带地球物理场的相关研究分析。