3-D data of thermal regime, water content, and slab dehydration in Alaska
Description
The data includes the three-dimensional slab temperature field (degrees Celsius), water content (wt%), dehydration rate (wt%/km), and subduction velocity field (cm/yr) of the subducting Pacific plate, as well as the coastline and volcano distribution in southern and southwestern Alaska. The data coordinates are an orthogonal coordinate system, where the origin of the coordinates is (155.00W, 54.90N), the x+ azimuth is 150 degrees clockwise from the north, the y+ azimuth is 60 degrees clockwise from the north, and the z+ direction is vertical downwards, in kilometers. The data source method is a three-dimensional finite-difference numerical simulation. 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 to analyze the geophysical field of the subduction zone. File naming: the data is stored in text paraview format. Data reading method: All ASCII code files in the data set can be directly opened with paraview software. Data list: 1. paraview_eq_USGS.vtk (Earthquake Catalog by IRIS, 2000-2010, Trabant et al., 2012, http://ds.iris.edu/ieb/) 2. paraview_map.vtk (global coastlines, GMT, Wessel and Smith, 1998) 3. paraview_slab.vtk (3-D thermal regime, slab water content, and slab dehydration) 4. paraview_volcano.vtk (global volcanoes at NCEI, Siebert et al., 2010)
Files
Steps to reproduce
The data include the 3-D temperature field (degrees Celsius), water content (wt%), dehydration rate (wt%/km), and subduction velocity field (cm/yr) of the subducting plate, as well as the coastline and volcano distribution in Alaska. The data of the model region have dimensions of 800×1600×400 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 subduction velocities inside a prescribed 3-D constrained volume of the oceanic lithosphere are given based on the kinematic plate subduction modeling method and the MORVEL plate motion data. The observation of surface heat flow and Curie point depths are used to constrain the model thermal regime. The geophysical calculation is ensured after the subduction thermal regime reaches a steady state. 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 Alaska are calculated.