Multichannel Analysis Surface Waves

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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..

Advantages of Multi-channel SASW (MASW) tests

  • 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

Instruments and software for Multi-channel SASW (MASW) tests

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