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A Study for the Construction of the P and S Velocity Tomogram from the Crosswell Seismic Data Generated by an Impulsive Source  

Lee, Doo-Sung (한성대학교 정보공학부)
Publication Information
Geophysics and Geophysical Exploration / v.6, no.3, 2003 , pp. 138-142 More about this Journal
Abstract
Crosswell seismic data were acquired in three sections crossing a tunnel of 3 different types; one was empty, another was ailed by sand, and the other was filled by rock debris. Both the P- and S-wave first arrivals were picked and the traveltime tomography was conducted to generate the P- and S- wave velocity tomograms on the all three sections. Among six tomograms, only one tomogram shows a low velocity zone that can be interpreted as a tunnel image. The tomogram is the P wave velocity image of a section that crosses an empty tunnel. The result of numerical analysis for the spatial resolution of the traveltime tomography was consistent to this finding.
Keywords
P-wave tomogram; S-wave tomogram; tunnel detection;
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