The MASW method

Multi-channel SASW (MASW) Tests: When are they needed?

Multi-channel SASW tests determine the speed profile of Vs shear waves, therefore:

the soil seismic type (A, B, C, D, E, S1, S2)
seismic actions for designing and verifying Civil Engineering works
the soil rigidity module
sinking and displacement of works that interact with the soil: buildings, bridges, embankment rises, supporting works, etc..

They supply the speed profile of Vs shear waves at a depth of over 30 m
They allow to identify the soil seismic type
As opposed to refractive seismic exploration, they can be used in any pseudo-horizontal stratigraphic situation, even in the presence of a layer
They are not invasive: there is no need of boring
They do not imply any damage to places and things
Fast and easy execution and data processing
Contained encumbrance of the equipment for performing tests
Mobility: easy transport of the required instruments for carrying out tests
High reliability/costs ratio

Tests are carried out by means of the following instruments:

Multi-channel digital acquirer
Receivers (accelerometers or geophones) that are able to measure the motion field in a vertical direction (at least 12 receivers are suggested)
Impulsive seismic sources made up by a 5-8 kg mallet and/or a falling weight of 30-50 kg
MASW Software by Vitantonio Roma