Data and code for Crosshole Probabalistic Analysis

This dataset contains three MATLAB scripts, their instructions manual and one field data workbook supporting the methodology presented in the accompanying manuscript. The codes address blind-zone refraction errors in crosshole seismic testing. Constrained_Probabilistic_Inversion.m performs automated detection of blind-zone refraction effects in crosshole velocity profiles. For each measurement node, the algorithm scans neighbouring layers for velocity contrasts sufficient to trigger floor or ceiling refractions. Results are reported as a mean corrected velocity with a 90% confidence interval. interface_sensitivity.m generates a dimensionless sensitivity chart relating the apparent-to-true velocity ratio (V_app/V_slow) to the normalised interface distance (h/D) for a range of velocity contrasts. Crosshole_Seismic_Forward_Modeler.m simulates a crosshole seismic survey over a user-defined layered earth model at multiple borehole spacings. For each depth-offset combination, the code determines the first-arriving wave (direct, floor refraction, or ceiling refraction) using Snell's law geometry, reconstructs the physical raypath, and computes the apparent velocity. Test_data_from_field_locations.xlsx contains crosshole seismic test data from a field investigation, including measurement depths, borehole spacing at each node, recorded arrival times, apparent wave velocities derived from direct-wave travel times, and corrected velocities obtained after application of the probabilistic inversion procedure. Crosshole_Seismic_Tools_UserManual.pdf— User manual documenting input file formats, user-adjustable parameters, output variables, and figures produced by each script, along with MATLAB version and toolbox requirements and a troubleshooting reference.本数据集包含3个MATLAB脚本、1份操作手册及1份现场数据工作簿，用于支撑随附研究论文中提出的方法学。上述代码用于解决跨孔地震测试中的盲区折射误差问题。 Constrained_Probabilistic_Inversion.m 可自动检测跨孔速度剖面中的盲区折射效应。针对每个测量节点，该算法会扫描相邻地层以识别足以引发底板折射或顶板折射的速度差，最终输出带90%置信区间的校正平均速度。 interface_sensitivity.m 可生成无量纲灵敏度图表，该图表关联了视速度与真速度之比（V_app/V_slow）和归一化界面距离（h/D），适用于多种速度差场景。 Crosshole_Seismic_Forward_Modeler.m 可针对用户自定义的层状地层模型，在多种钻孔间距下模拟跨孔地震勘探。针对每个深度-偏移距组合，该代码将利用斯奈尔（Snell）定律几何关系识别初至波（直达波、底板折射波或顶板折射波），重建物理射线路径并计算视速度。 Test_data_from_field_locations.xlsx 包含某野外勘察的跨孔地震测试数据，涵盖测量深度、各节点处的钻孔间距、记录的走时、由直达波走时推导的视波速，以及经概率反演程序校正后的速度。 Crosshole_Seismic_Tools_UserManual.pdf 为本工具用户手册，详细说明了各脚本的输入文件格式、可自定义参数、输出变量与生成图像，同时包含MATLAB版本与工具箱要求及故障排查参考资料。