Data and code for Crosshole Probabalistic Analysis

Description

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.

Steps to reproduce

The figures can be reproduced using the document Crosshole_Seismic_Tools_UserManual.pdf and the associated MATLAB codes. The manual contains all the necessary steps needed. The data file was prepared using the arrival times estimated from the field data gathered during crosshole surveys mentioned in the submitted manuscript.

Institutions

• Indian Institute of Science Bangalore

  Karnataka, Bengaluru

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