Multi-Channel Analysis of Surface Waves (MASW)

MASW is a nondestructive seismic method used to evaluate the shear-wave velocity distribution and arrangement of overburden soil deposits and the bedrock as well.  It analyses dispersion properties of certain types of seismic surface waves (fundamental-mode Rayleigh waves) propagating horizontally along the surface of measurement directly from impact points to receivers (hammer shot points to geophones, respectively), or from passive noise sources such as traffic nearby. The method provides the shear wave (Vs) information in either 1D (depth) or 2D (depth and surface distance) formats.  The results can be used to estimate soil and rock strength (stiffness), determine the depth and topography of bedrock (even if bedrock is below water table), map subsurface geology (lateral and vertical variations), map low velocity layers, determine IBC Vs100 (Vs30) site classification, and aid in liquefaction potential analysis.

Applicable on: Soil, rock and paved surfaces.

Test for: Shear wave velocity, depth to and shape of bedrock and soil stiffness estimates.