Subduction dynamics and seismic mechanisms of the Caroline slab below New Guinea: Insights from 3-D thermal structures and dehydration behaviors

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 slab, as well as the coastline and volcano distribution. The data coordinates are an orthogonal coordinate system. The geometry of the subducted slab is well constrained by Slab2, and the slab 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 New Guinea 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 ±0.1 cm/yr. This data can be further used analyzing the geophysical field of subduction zone.

该数据集涵盖俯冲板片的三维温度场（单位：摄氏度）、含水量（重量百分比，wt%）、脱水速率（wt%/km）、岩石相变分布与俯冲速度场（单位：厘米/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。俯冲板片的几何形态由Slab2严格约束，板片年龄数据由EarthByte提供。温度边界条件符合板块冷却模型。板片底部与垂直平面被设定为绝热透水边界，顶面则固定为0摄氏度且为刚性边界。本数据集基于源自原始代码stag3d的三维数值热模拟（3-D numerical thermal modeling）生成，模型采用非弹性流体近似（anelastic liquid approximation）以及质量、动量与能量守恒方程组。本研究基于三维热力学模型与源自IRIS的地震目录，计算得到了新几内亚区域内板片热状态、含水量与板片脱水分布相关数据。当地俯冲热系统达到稳态后，方可开展本次地球物理计算。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。该数据集可进一步用于俯冲带地球物理场的相关分析研究。