Multi-channel Analysis of Surface Waves (MASW)

Multi-channel Analysis of Surface Waves (MASW)

GeoPhysi excels in conducting Multi-channel Analysis of Surface Waves (MASW), a highly effective geophysical method used to evaluate subsurface shear wave velocity profiles. MASW is particularly valuable for assessing soil stiffness, identifying subsurface layering, and conducting seismic site characterization. This non-invasive technique provides detailed information essential for the design and construction of various engineering projects.

MASW works by generating surface waves using a controlled energy source and recording the waves’ propagation across multiple channels. By analyzing the dispersion of these waves, GeoPhysi can accurately determine the shear wave velocity at different depths. This data is crucial for understanding the seismic response of the ground, designing stable foundations, and assessing potential earthquake hazards.

One of the key strengths of MASW is its ability to provide high-resolution subsurface profiles, making it ideal for projects requiring detailed soil characterization. This method is also non-destructive, versatile, and can be applied in various environments, from urban settings to undeveloped areas.

At GeoPhysi, we are committed to delivering high-quality MASW surveys that meet the specific needs of our clients. Our team of experienced geophysicists utilizes state-of-the-art equipment and advanced data processing techniques to ensure accurate and reliable results. We work closely with clients to understand their project requirements and provide tailored solutions that support successful project outcomes.

Trust GeoPhysi for your MASW needs and benefit from our expertise, precision, and dedication to excellence. Contact us today to learn more about how our services can enhance your project.

Technical reference · MASW

What MASW measures

Multi-channel Analysis of Surface Waves (MASW) analyzes the dispersion of surface waves recorded by a linear array to estimate a shear-wave velocity profile. Active MASW uses a controlled source; passive or combined approaches use ambient vibration where the site and target make that practical.

The output is an interpreted model with assumptions and uncertainty. It can support soil and rock characterization, seismic site assessment and engineering decisions when acquisition, mode picking and inversion are quality-controlled.

Selection, trade-offs and limitations

• MASW vs MAM: MASW provides stronger control when an active source is feasible; MAM is passive and can be useful where ambient vibration is the available signal.
• MASW vs seismic refraction: MASW constrains surface-wave velocity, while refraction relies on travel-time behaviour and identifiable velocity contrasts.
• Resolution and depth: array length, source, noise, frequency range and inversion assumptions constrain the usable model; fixed depth or resolution claims require project evidence.
• QA/QC: document geometry, source and receiver conditions, dispersion-curve picks, mode ambiguity, inversion fit and independent checks.

Related methods: MAM, seismic refraction, surface-wave seismic survey and the Technical Hub.

Page responsibility: GEOOE Technical Center. Interpretations should be reviewed against field records and the responsible engineer’s requirements.