GSR-3D Ground Imaging Tomography  

The GSR-3D Ground Imaging system uses finite differencing wave propagation and automatic signal processing techniques to quickly obtain high resolution, accurate 3D ground images. It illustrates significant advancements in 2D and 3D seismic refraction data processing and presentation.  We provide fast, high quality 3D seismic data processing service. The following are examples of 3D seismic data interpretation projects.


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    Assessing the effectiveness of compaction grouting.
    Detecting dam scour depths.
    Mapping bedrock.

Assessing the effectiveness of compaction grouting


Rapid and inexpensive seismic method was utilized by FHWA Central Federal Lands Highway Division in Rocky Mountain National Park, Colorado, during rehabilitation of a historic placed-rock armored slope structure located below roadway gradealong the outboard lane.  The GSR-3D software was used to generate accurate before-grouting and post-grouting volumetric difference images that depicts the effect of grouting, including the resultant grout columns and ground densification characteristics.



GSR-3D software incorporates time, frequency, and velocity filters, and uses advanced pattern matching analysis of the signal spectrogram as well as the waveform to automatically determine consistent travel time picks.  GSR-3D estimates travel times by propagating a wave across a continuous velocity model using wave front vector interpolation, resulting in efficient and accurate travel time estimates. This technique quickly converges to the solution of minimum travel time error with minimum velocity variation, providing consistent results.

Detecting dam scour depths  



Seismic signals collected on dam surface were processed by GSR-3D software. 3D volumetric ground image which engineers can easily interpret were provided. The detected scour hole is represented by the pink color in the tomography, the position and volume can be viewed in detail by slicing, zooming and rotating. The 3D tomography result can be sliced in X, Y, Z direction as well as by its physical character, the velocity, or the density of the material. We provide fast, high quality 3D seismic data processing service at low cost.

Mapping bedrock  



Seismic tomography results were used to build 3D ground model: map the top of bedrock and determine thickness of overburden soil. Interested volume of overburden soil deposits and bedrock were excavated. 3D seismic tomography results are not just images, they are 3D models that will be used for the next phase of work -- design and construction of structures.