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.

本数据集涵盖俯冲板片（subducting plate）的三维温度场（单位：摄氏度）、含水量（重量百分比，wt%）、脱水速率（重量百分比每公里，wt%/km）、岩石相变分布与俯冲速度场（单位：厘米每年，cm/yr），同时包含海岸线与火山分布。数据集采用正交坐标系。俯冲板片的几何形态经Slab2模型严格约束，板片年龄数据由EarthByte提供。温度边界条件与板块冷却模型相符。板片底部与垂直平面被设定为绝热透水边界，顶面则设为0摄氏度恒温刚性边界。本数据集基于原始代码stag3d开发的三维数值热模拟获取。该模拟采用非弹性流体近似（anelastic liquid approximation），并引入质量、动量与能量守恒方程。本数据集基于三维热力学模型与IRIS地震目录，计算得到瓦努阿图区域内板片热状态、含水量及板片脱水分布数据。所有地球物理计算均在俯冲热系统达到稳态后进行。温度场误差范围为±50摄氏度，速度场误差范围为±0.1cm/yr。本数据集可进一步用于俯冲带（subduction zone）地球物理场的相关研究分析。