The Multi-channel Analysis of Surface Waves (MASW) is a seismic method used to evaluate the shear-wave velocities of subsurface materials through the analysis of the dispersion properties of Rayleigh surface waves ("ground roll"). The data are collected on the surface without the need of borehole. MASW data collection may be extended to 2D or 3D profiling/imaging.

The MASW seismic method allows to obtain the shear wave velocity (Vs) distribution in the ground and bedrock. It can be applied as a 1D sounding or as 2D profiles.

Typical applications of MASW include:

  • Vs30 calculated for Seismic Site Classification (National Building Code);
  • Bedrock profiling;
  • Calculating elastic moduli and soil properties;
  • Calculating soil damping ratios;
  • Locating loose soil areas and soft clay areas;
  • Mapping voids;
  • Seismic shear-wave velocities for liquefaction analysis;
  • Geological mapping.

For more information, please contact our Ground Survey Team.

MASW Surface wave dispersion analysis
2D shear-wave velocity profile from MASW data

Marine MASW

Geophysics GPR has been a pioneer in the marine MASW technique.  Visit the Marine chapter of our website to learn more.