Data for: Brittle-ductile transition depth versus convergence rate in shallow crustal thrust faults: considerations on seismogenic volume and impact on seismicity

This data publication includes a table containing results of 2-D thermo-mechanical FE models dedicated to intra-plate thrusts and thrusts within fold-and-thrust belts (shallow crustal) with the scope of locating the brittle-ductile transition (BDT) depth in function of the convergence rate. Modeled geometries describes a 2D portion of wet-quartzitic upper crust 250 km wide and 40 km thick, cut by a fault with different dip values. the fault decoupling is simulated via a 2 km thick weak zone characterized by rheological parameters homogeneous with the rest of the model domain but with lower friction angle and small cohesion. Shortening is simulated via fixed velocities at the left boundary of the model applied for an evolution time of 100 kyr. A set of models was run for all considered fault dip values (15-40 degrees), assuming convergence rates varying between 1 and 10 cm/yr and, for sensitivity analysis, varying fault friction angle (from 3 to 30 degrees), cohesion (from 0 to 10 MPa), grain size of the domain (from 1 to 3 mm) and initial temperature profile (i.e., temperature at the bottom of the model from 400 to 600 °C).
The table of results is composed by 10 columns providing: 1) BDT along-distance (x) coordinate; 2) BDT depth (y) coordinate; 3) fault dip angle; 4) differential stress value at the BDT; 5) convergence rate; 6) evolution time of the model; 7) T at the bottom of the model; 8) angle of internal friction assumed for the fault; 9) cohesion assumed for the fault; 10) grain size assumed for the domain.

本数据发布包括一张表格，其中包含了针对板块内部推力和褶皱逆冲带（浅层地壳）内部的二维热力学有限元模型的结果，旨在根据收敛率确定脆性-韧性转换（BDT）深度。所建模的几何形状描述了一个250公里宽、40公里厚的湿石英质上地壳二维部分，被具有不同倾角值的断层切割。断层去耦通过一个2公里厚的弱区进行模拟，该弱区的流变学参数与模型域的其他部分均匀一致，但摩擦角较低且内聚力较小。缩短通过在模型左侧边界施加固定速度来模拟，该速度适用于100千年的演化时间。针对所有考虑的断层倾角值（15-40度），假设收敛率在1至10厘米/年之间变化，并且为了进行敏感性分析，断层摩擦角（从3度至30度）、内聚力（从0至10 MPa）、域的粒度（从1至3 mm）和初始温度分布（即模型底部的温度从400至600°C）均有所变化。结果表格由10列组成，提供以下信息：1）BDT沿距离（x）坐标；2）BDT深度（y）坐标；3）断层倾角；4）BDT处的差分应力值；5）收敛率；6）模型的演化时间；7）模型底部的温度；8）假设的断层内摩擦角；9）假设的断层内聚力；10）假设的域粒度。