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Olson Instruments, Nondestructive Testing Equipment, Nondestructive Evaluation, Olsen | Testing Infrastructure Nondestructively

material moduli, shear wave velocity profiles, sasw, olson, material stiffness, layer thickness, geophysical, asphalt, masonry, stone, wood

July 22, 2018

Check Out Olson's New


Affordable Foundation Test Gauge


NDT System Add-On — Spectral Analysis of Surface waves - G

USA Sales: 303.423.1212          International Sales: Click here for Map

Spectral Analysis of Surface Waves

click here for method graphic [+]

Base Model:
SASW-G [Geophysical Testing]

click here for enlarged view [+]

Scroll down to see a list of Available Models and Key Features for the SASW test method add-on.

Save money! Contact Olson Instruments when adding on to an existing system, or purchasing multiple systems as some of the components are common to other test methods.


Spectral Analysis of Surface Waves (SASW-G) investigations are typically applied to assess material properties of soil and rock.

The Spectral Analysis of Surface Waves (SASW-S) system is designed to measure the in-place shear wave velocity profile of soil and rock without requiring a borehole. In general, the method uses the dispersive characteristics of surface waves to determine the variation of the shear wave velocity (stiffness) of layered systems with depth. Once the shear wave velocity profiles are determined, shear and Young’s moduli of the materials can be estimated through the use of elastic wave theory equations. The shear wave velocity profiles (shear wave velocity versus depth) are determined from the experimental dispersion curves (surface wave velocity versus wavelength) obtained from SASW-G measurements through a process called forward modeling or through an inversion process.

The SASW-G method has been applied to soil sites with measurement depths exceeding 150 feet. It should be noted that the method requires an accessible area on the surface with a length equal to or greater than the measurement depth required. The method can applied on both bare ground as well as paved surfaces. Add the SASW-S bar (shown in photo at left) for structural and pavement applications.

Freedom Data PC or NDE 360 Platform
Required, Sold Separately
Freedom Data PC
NDE 360
(SASW-G4 Model only)


Hands-on training classes are available for all of our Nondestructive Testing Methods at our Wheat Ridge, Colorado (USA) location, which is a suburb located appromately 15 minutes northwest of downtown Denver. Training may be available at your location by one of our agents upon special arrangement.

For complete details about the Spectral Analysis of Surface Waves-G system available as an add-on test for the Freedom Data PC or NDE 360 platform, call toll free 1-888-423-1214 or email:



Applicable On:

  • Asphalt
  • Concrete
  • Masonry
  • Stone
  • Wood

Test For:

  • Layer Thickness
  • Soil & Rock Moduli
  • Shear Wave
    Velocity Profiles

Meets ASTM:

  • N/A

Meets ACI:

  • ACI 228.2R


All of Olson Instruments have been researched, tested, and used on-site daily by our sister company, Olson Engineering, world reknowned for NDT consulting. The OE Website is loaded with Tech Brief and project photos using the equipment shown on this website. Purchase our products to “do-it-yourself”, or hire an Olson Engineering Nondestructive Testing professional for your next project