VoiLA-P19: A 3-D P-wave velocity model of the upper mantle beneath the Caribbean derived from teleseismic travel time tomography

## README # ___________________ ### VoiLA-P19: A 3-D P-wave velocity model of the upper mantle beneath the Caribbean derived from teleseismic travel time tomography ------------- The files layer_XX.xyz (with XX indicating the number of the layer from 01-08) contain P-wave velocity anomalies (3rd column) in % with reference to the AK135 model at given longitudes (1st column) ranging from -73.5° to -57.0° and latitudes (2nd column) ranging from 6.5° to 23.0° with increments of 0.05° in both longitude and latitude. The files layer_XX.grd contain the same model as .grd-files. The 8 layers of the model correspond to the following depth ranges: 0- 40 km : layer01 40-100 km : layer02 100-160 km : layer03 160-240 km : layer04 230-320 km : layer05 320-410 km : layer06 410-530 km : layer07 530-660 km : layer08 A GMT script 'plot_layers.gmt' is provided to plot horizontal slices of the velocity anomalies. More information on the final model and a suggested set of interpretations can be found in: Braszus, B., et al. (2021), Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction, Manuscript in revision for Nature Communications. Further details of the method and tests for an earlier version of the model are in: Braszus, B. (2019), 3D teleseismic travel time tomography along the Lesser Antilles subduction zone, 83 pp, Karlsruhe Institute of Technology, Karlsruhe, Germany, doi:10.5445/IR/1000124003.

# 数据集说明 # ___________________
### VoiLA-P19：基于远震走时层析成像（teleseismic travel time tomography）的加勒比地区上地幔三维P波速度模型
文件`layer_XX.xyz`（其中XX代表01至08的层数编号）存储了P波速度异常（P-wave velocity anomalies）值（第3列），单位为百分比，其参考基准为AK135模型；数据的经度范围为-73.5°至-57.0°（第1列），纬度范围为6.5°至23.0°（第2列），经纬度的空间步长均为0.05°。
文件`layer_XX.grd`与`.xyz`格式文件存储了同一套模型数据，仅文件格式为.grd格式。
本模型共包含8个分层，各分层对应的深度范围如下：
0–40 km：layer01
40–100 km：layer02
100–160 km：layer03
160–240 km：layer04
230–320 km：layer05
320–410 km：layer06
410–530 km：layer07
530–660 km：layer08

本数据集提供了通用制图工具（GMT）脚本`plot_layers.gmt`，用于绘制速度异常的水平切片图。
关于该最终模型的更多细节以及建议的解释方案，可参阅以下文献：
Braszus, B. 等(2021)，《加勒比地区俯冲历史：基于上地幔地震成像与板块重建》，已提交至《Nature Communications》待修订。
关于该方法的更多细节以及该模型早期版本的测试结果，可参阅以下文献：
Braszus, B.(2019)，《小安的列斯俯冲带三维远震走时层析成像》，共83页，德国卡尔斯鲁厄理工学院（Karlsruhe Institute of Technology），卡尔斯鲁厄，doi:10.5445/IR/1000124003。