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Multi-channel Analysis
of Surface Waves

Multi-channel Analysis of Surface Waves (MASW) is an investigation technique that uses generated energy (such as a sledgehammer blow) and measures how it travels through the ground.

Geophysics team performing a MASW test

MASW is an investigation technique that measures how generated energy travels through the ground.

A series of sensors, called geophones, are placed in a line to take measurements that will then provide the shear-wave (Vs) profile in either 1D (depth) or 2D (depth and surface distance)

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People possibly relate ‘energy through ground’ situations mostly with earthquakes, but using MASW can be useful in providing a range of solutions:

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  • Aid in liquefaction potential analysis

  • Finding the lateral and vertical variations in the subsurface

  • Depth to groundwater

  • Depth of overburden/depth to bedrock

  • Vs30 (Shear-wave velocity over the first 30 m depth)​

Geophysics performing a MASW test with hammer
MASW testing machine
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