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Over the past four decades, the Near-Surface Geophysics group at the Geological Survey of Canada (GSC) has collected borehole geophysical logs in Quaternary sediments across Canada. Project work has primarily been driven by long term research programs related to permafrost, groundwater, and natural hazards. This work has resulted in a dataset of geophysical logs in 226 boreholes across the country. Primary logging methods include natural and active gamma, inductive conductivity and magnetic susceptibility, fluid temperature, and compressional and shear wave velocities. Over the years, tool calibration runs have been conducted at the Bell’s Corners Borehole Calibration Facility in Ottawa, ON, to ensure that all the tools provide repeatable results which are in agreement with the standards published by the GSC. The compilation presented in this report provides logs as digital Log ASCII Standard (LAS) files, WellCAD files, and also in an interactive Google Earth format with links to PDF images of the log suites. The purpose of this Open File is to release the complete suite of geophysical logs so that the all members of the public may have access to this valuable national dataset.

Borehole geophysical logs in unconsolidated sediments across Canada