Applications

• Bedrock mapping
• Degree of sediment compaction
• Determination of dynamic parameters (e.g., shear modulus, elastic moduli, Poisson ratio)
• Void detection
• Liquefaction potential
• Subsurface profiling
• Imaging velocity inversions (hard layer overlying softer layer)

Method

The Multi-channel Analysis of Surface Waves (MASW) method is a non-invasive seismic method which uses the elastic properties of subsurface materials to determine the subsurface characterisation. However, by analysis of the dispersive properties of varying frequencies from a single seismic source, shear-wave velocity (Vs) and associated geotechnical dynamic parameters of the subsurface material can be determined through the joint (multi-component) analysis of surface wave propagation. MASW (Multi-channel Analysis of Surface Waves for both Rayleigh and Love waves), ESAC (Extended Spatial Autocorrelation), MFA (Multiple Filter Analysis), ReMi (Refraction Microtremors), HVSR (Horizontal-to-Vertical Spectral Ratio), HoliSurface® approach (a patented methodology by eliosoft), MAAM (Miniature Array Analysis of Microtremors) and Full Velocity Spectrum (FVS) analyses. By joint analysis of various components of Rayleigh and Love waves, a more robust subsurface model free from ambiguities and thus suitable for reliable geotechnical studies, seismic hazard and risk assessment, environmental applications can be determined using our winMASW Academy and HoliSurface software.

MASW & HVSR Surveys at Ahafo North, Sunyani

Modelled shear wave velocity for L1, Ahafo North, Sunyani

Joint analysis and inversion of vertical & radial components of Raleigh wave for a more reliable shear wave velocity within the top 30m of the subsurface.