Geonics Limited EM31-SH

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Summary

EM31-SH Instrument Specifications

EM31-SH Introduction

EM31-SH Operating Instructions

Ground Conductivity Measurements

Detailed steps for measuring ground conductivity, covering setup and functional checks.

Buried Metal Detection

Using the inphase component for detecting buried metallic objects and its setup.

EM31-SH Instrument Calibration

Null Calibration

Setting the zero reference point of the EM31 instrument for accurate measurements.

Absolute Calibration

Calibrating the instrument against known ground conductivity for precise measurements.

EM31-SH Survey Technique

EM31-SH Data Interpretation

Uniform Halfspace Data Interpretation

Understanding EM31 responses in uniform ground conditions and variations in conductivity.

Multi-Layered Earth Data Interpretation

Techniques for interpreting EM31 data in horizontally layered geological environments.

EM31-SH Case Histories: Conductivity Mapping

Example A: Heart Lake, Ontario

Comparison of EM31 results with conventional resistivity over till and sand/gravel.

Example B: Sunnybrook Park

Illustrating depth penetration differences between EM31 and EM34 systems.

Example C: Cavendish Test Site

Assessing overburden resistivity and instrument performance in conductive zones.

Example D: Lake Scugog

Demonstrating high resolution and survey speed using the EM31 system.

Example E: Cooksville;Mississauga

Using EM31 for buried river channel detection and depth interpretation.

Example F: Discontinuous Permafrost

Comparing EM31 results with the Radiohm technique for permafrost mapping.

Example G: Pre-glacial River Valley

Outlining a river valley using EM31 and EM34 data with depth modeling.