GeoTomCG - 4 Pages

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Catalogue excerpts

FILE LDfT    DATA MODEL QPT10M8 RAYEATHE • 3D tomographic inversions • Practical, easy to use • Versatile constraints for using site information to counteract non-uniqueness • Attenuation inversion with curved rays from traveltime inversion • Plots for quality control of data and processing GeoTomCG can process crosshole or VSP seismic or radar data. Display shows calculated radar velocities. High velocity zone at depth of 27 m is caused by an abandoned mine. Other zones of contrasting velocities are geological features. S and R indicate source and receiver positions, respectively GeoTomCG performs 3D tomographic analyses. Source-to-receiver traveltimes can be anayzed to calculate velocities, or amplitudes can be analyzed to calculate attenuation. Source and receiver coordinates can be in any configuration within a 3D grid. The tomographic analysis calculates velocity and/or attenuation at points within the grid. Anisotropy can be specified for each point of the grid. Raypaths can be straight or curved. The ability to perform 3D analysis is an important advantage in counteracting the problem of nonuniqueness with crosshole data. Site information can be used to obtain more reliable results and to counteract the problem of nonuniqueness. Options include: 1. Maximum and minimum velocities. 2. Constraints that take into account the uncertainty in site knowledge. 3. Constant velocity in user-selected areas or volumes in the grid. GeoTomCG provides graphical displays of velocities, raypath densities, and other parameters for inspecting results and preparing preliminary reports. These displays can be copied to the Windows clipboard. Plots for quality control include traveltime versus distance, residual versus raypath angle, velocity versus raypath angle, and others. GeoTomCG also provides 3D numerical results and 2D slices of the 3D grid as ASCII files that can be read by commercial 3D and 2D visualization programs for preparing formal reports and presentations. P.A.S.I. srl - Via Galliari, 5/E - 10125 TORINO - ITALY Tel. + 39 011 650.70.33 (r.a.) Fax +39 011 658.646 E-MAIL info@pasisrl.it V.A.T. IT 00737320010 - C.C.I.A.A. Torino N. 269051 Web: http://www.geophysics.com

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Raypaths can be saved to a file and displayed. Curved-ray amplitude inversions can be performed with curved raypaths from velocity inversions. (Amplitude inversions cannot provide appropriate curved rays because ray bending depends on contrasts in velocity, not attenuation.) The user's manual discusses tomographic analysis of seismic and electromagnetic traveltime and amplitude data. Examples with sample data allows users to practice traveltime and amplitude data processing. GeoTomCG is written in MS Visual C++ and runs under Windows with a graphical user interface. Eight hours of program support...

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• Output formatted as input for 3D tomography program GeoTomCG • Reads all common seismograph formats • Versatile filtering options • Works effectively with large files, 144 channels or more • User can select any range of channels to display. TomTime provides automatic and manual picking of traveltimes and amplitudes for all common seismograph waveform files. Output is in the format used for input by the 3D tomographic program GeoTomCG. The format is: RayIdentifier Source X,Y,Z Receiver X,Y,Z Time Amplitude (optional). Times picked with automatic picking are the first breaks, and amplitudes are...

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TomTime can read the coordinate file before reading waveform files, and assign coordinates corresponding to the identifiers. After the coordinate file has been read, another display option allows times from a GeoTomCG data file to be displayed on the traces. TomTime reads the coordinates in the data file and matches them with the ones in the coordinate file described above. It then displays the time from the data file on the appropriate traces. GeoTomCG can provide a data file of calculated times, so this option allows the display of calculated times from tomographic inversions. Time-picks and...

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