Heterogeneous slab thermal dehydration driving warm subduction zone 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, where the origin of the coordinates is (166.3E, 16.4S).The data of the model region have dimensions of 1200×500×400 km (length×width×depth). The geometry of the subducted plate is well constrained by Slab2.0, 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。数据集采用正交坐标系，坐标原点为(166.3°E, 16.4°S)。模型区域尺寸为1200×500×400千米（长×宽×深）。俯冲板片的几何形态由Slab2.0模型严格约束，板块年龄数据由EarthByte提供。温度边界条件符合板块冷却模型，板片底部及垂直平面被设定为绝热透水边界，顶面则设置为固定温度（0℃）且刚性边界。本数据集通过基于原始代码stag3d开发的三维数值热模拟生成，模型采用非弹性流体近似以及质量、动量与能量守恒方程。研究人员基于三维热机械模型，并结合IRIS收录的地震目录，计算得到了瓦努阿图地区的板片热状态、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状态达到稳态后完成。温度场的误差范围为±50℃，速度场的误差范围为±0.1cm/yr。本数据集可进一步用于俯冲带地球物理场相关研究分析。