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RAYFRACT® Seismic Refraction Tomography - Subsurface Seismic Velocity Models for Geotechnical Engineering and Exploration

Our Rayfract® seismic refraction tomography software allows reliable imaging of subsurface velocity structure including faults, strong lateral velocity variation and other velocity anomalies. Our Smooth inversion tomographic method is based on physically meaningful modeling of seismic first break energy refraction, transmission and diffraction. Both P-wave and S-wave propagation is modeled with wave paths (also known as Fresnel volumes) instead of conventional seismic rays. This increases the numerical robustness of the method. A smooth initial 1D gradient model is determined automatically directly from the traveltime data, by averaging Delta-t-V (improved Wiechert-Herglotz) method 1D velocity-depth profiles along the seismic line. This procedure delivers reliable smoothed models even in case of velocity inversions. The initial model is then refined with true 2D WET Wavepath Eikonal Traveltime tomography. No need to map traveltimes to refractors. Supports many input data formats and extreme topography. Also allows interpretation of traveltimes with conventional Plus-Minus and Wavefront seismic refraction methods. Now supports Smooth inversion with constant-velocity initial model, for crosshole, walkaway VSP and uphole refraction surveys. Visit our booth #33 at SAGEEP09 in Fort Worth, Texas.

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WET tomogram with core. Initial model obtained with Delta-t-V method.

View these tutorials, application samples and theoretical publications :

An Evaluation of Methods and Available Software for Seismic Refraction Tomography Analysis (Jacob R. Sheehan et al., Oak Ridge National Laboratory, JEEG March 2005. Compares Rayfract with GeoTomo LLC GeoCT-II and OYO SeisImager; PDF)

Ground Proving Three Seismic Refraction Tomography Programs (Dennis R. Hiltunen et al. 2007, University of Florida; PDF. Compares OYO SeisImager and Optim LLC SeisOpt Pro with Rayfract)

Seismic Refraction Tomography for volume analysis of saturated alluvium (Michael H. Powers and Bethany L. Burton, USGS 2006. Compares GeoTomo LLC GeoCT-II with Rayfract; PDF)

Seismic characterization of an Alpine site (L.V. Socco et al. EAGE Near Surface Geophysics Aug 2008. Correlates WET tomography with reflection seismic, surface wave and pseudo-2D shear wave interpretation plus downhole measurement; PDF)

Underwater seismic refraction (Robert J. Whiteley and Simon B. Stewart 2008. WET tomography confirmed with onshore boreholes; PDF)

WET tomography compared to conventional refraction and magnetic lineaments (Håkan Mattsson, GeoVista AB, SKB report R-07-56 Sep 2007, pages 131-144; PDF)

Rippability imaging of weathered granitic rock. Compares WET with Palmer GRM (Zonge Geosciences Inc. 2006; PDF)

Sub-bottom river imaging with Smooth inversion and constant-velocity initial model (Geotomographie GmbH data; PDF)

Active landslide imaging with two crossing lines, different receiver spacing (JOANNEUM RESEARCH data; PDF)

Smooth inversion of cross-hole survey, with constant-velocity initial model (International Geophysical Technology S.L. data; PDF)

Smooth inversion of Geometrics SeisImager sample file (Geofisica Misure s.n.c. data; PDF)

Smooth inversion of Optim LLC SeisOpt® data set (FUGRO WEST data; PDF)

2D sections of porosity and water saturation percent from combined resistivity and seismic surveys for hydrogeologic studies (R. Mota and F. Monteiro dos Santos, SEG The Leading Edge June 2006. Simulated Annealing of Res2DInv and Rayfract output; purchase PDF)

Sinkhole imaging with Smooth 2D inversion compared with conventional Wavefront interpretation (PDF)

Velocity imaging through complex near-surface structures by tomography (Xianhuai Zhu, EAGE 64th Conference & Exhibition, Florence 2002; PDF. Shows diffraction and scattering of seismic first break energy penetrating thin high-velocity Basalt layer)

Land Streamer Aided Geophysical Studies at Saqqara, Egypt (Carlyle R. Miller et al. JEEG December 2005; HTML)

Client WET interpretations imaging faults, dikes, boulders and stratigraphy (Terra Geosciences 2007)

Refraction seismic theory and application (Jacques Jenny, Microsoft PowerPoint)

Subsurface velocity imaging below street (Zivko Terzic, 2007; PDF)

Comparison of shallow seismic refraction interpretation methods for regolith mapping (Robert J. Whiteley and Peter J. Eccleston, ASEG Exploration Geophysics Dec 2006 final draft; PDF)

Comparison of reflection seismic with refraction seismic interpretation, for Turbidite imaging (Maria Antonieta Gaya and Teresa Teixido, 2004; PDF)

Refraction data interpretation with Rayfract® software (Microsoft PowerPoint slide show)

Comparison of pseudo-2D Delta-t-V initial model with 1D gradient initial model, for basement depression model as described by Derecke Palmer (PDF)

Comparison of pseudo-2D Delta-t-V initial model with 1D gradient initial model, for basement depression model as described by Jacob Sheehan (PDF)

Comparison of 2D WET tomographic imaging with conventional refraction interpretation (Håkan Mattsson, GeoVista AB; PDF)

seg2_edit; A Program for Editing and Manipulating SEG-2 Files, by K. J. Ellefsen (USGS Open-File Report; PDF)

Tau-p refraction tomographic imaging in the Canadian foothills (Sylvestre Charles et al. CSEG 2006; PDF)

Tau-p refraction tomography and statics, compared to well stratigraphy and applied to reflection survey (WesternGeco; PDF)

Rayfract in Marine Surveys (Zivko Terzic, 2006; PDF)

The Plus-Minus Method of Interpreting Seismic Refraction Sections (J.G. Hagedoorn 1959, EAGE Geophysical Prospecting, volume 7, pp. 158-182; PDF)

Comparison of pseudo 2D Delta-t-V initial model with 1D gradient initial model (PDF)

Thrust Fault Modeling and Imaging with Surfer 8 and Rayfract 2.51 (PDF)

Imaging of dynamic Poisson's ratio with fail-safe "Smooth inversion" as implemented for version 2.51 (PDF)

Groundwater remeditation study using Rayfract and Resistivity (William E. Doll et al. 2002, Oak Ridge National Laboratory Tennessee; PDF)

Investigation of a landfill with Seismic Refraction, Resistivity and Electromagnetic methods (William E. Doll et al. 2001, Oak Ridge National Laboratory Tennessee; Adobe Acrobat; compares Rayfract with Rimrock Geophysics SIPT-2 software)




More tutorials, application samples and theoretical publications


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