SeisOpt™ ReMi©

Comprehensive Subsurface Solution

Applications

  • IBC Site classification
  • Rock properties
  • Geological structures
  • Liquefaction analysis
  • Thickness of geologic layers
  • Earthquake site response
  • Soil compaction control
  • Subsurface mapping
  • Estimation of the strength of subsurface materials
  • Mapping buried cultural features such as dumps
  • Mapping velocity inversions
  • Rippability
  • Depth to bedrock
  • Slope Stability

Refraction Microtremor (ReMi) Method:

ReMi© uses ambient noise as a seismic source, it is ideal for use in busy areas, such as airports, cities and highways. Since being released in 2001, SeisOpt ReMi© has become the international standard for determining International Building Code (IBC) ground shaking potential.

The ReMi method uses refraction microtremor recordings from standard refraction equipment to estimate 30 m (100 ft) average shear wave velocities. Design ready outputs are created for one- and two-dimensional shear wave profiles down to depths of 100 m with 5%-15% accuracy. Other techniques of estimating 30 m (100 ft) average shear wave velocities (Vs100’) and one-dimensional shear velocities for assessment of earthquake site response are too costly for use at most construction sites.

ReMi measures seismic surface waves that are generated from various sources such as sledge hammer strikes, passing cars, and everyday human movement. The frequency of the available geophones, the distance between geophone takeouts, the total length of the recording array, and the distribution of subsurface velocities will determine the maximum depth up to which shear wave velocities can be derived.

It uses standard refraction equipment, simple recording with no source, a wavefield transformation data processing technique, and an interactive Rayleigh-wave dispersion-modeling tool. The slowness-frequency (slowness is inverse of velocity) wavefield transformation is particularly effective in allowing accurate picking of Rayleigh-wave phase-velocity dispersion curves despite the presence of waves propagating across the linear array at high apparent velocities, higher-mode Rayleigh waves, body waves, airwaves, and incoherent noise (Louie, 2001). Validation of the ReMi technique through comparison of shear wave measurements from boreholes and MASW up to depths of 100 m contain average uncertainties of 20%.

SeisOpt ReMi 2D:

SeisOpt ReMi 2D velocity profile that reveals the structure of the subsurface.  The hotter colors, or reds, represent higher shear wave velocities and the cooler colors, or blues, represent lower shear wave velocities.  Depth in feet is on the “y” axis and distance in feet is on the “x” axis.  ReMi 2D velocity profiles are used in geotechnical engineering and design projects to save money and get more accurate subsurface information from borehole programs. Finding weaknesses in retaining structures such as earthen dams and for assisting in finding the proper depth for footings, pilings and foundations.

SeisOpt™ ReMi© References

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