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http://dx.doi.org/10.7582/GGE.2017.20.3.163

Analysis on the Reliability and Influence Factors of Refraction Traveltime Tomography Depending on Source-receiver Configuration  

Lee, Donguk (Department of Energy Resources Engineering, Inha University)
Park, Yunhui (Department of Energy Resources Engineering, Inha University)
Pyun, Sukjoon (Department of Energy Resources Engineering, Inha University)
Publication Information
Geophysics and Geophysical Exploration / v.20, no.3, 2017 , pp. 163-175 More about this Journal
Abstract
In land seismic exploration, irregular surface topography and weathering layer in near surface distorts the reflected signals of data. Therefore, typical land seismic data should be compensated for this distortion by static correction. To perform the static correction, near-surface velocity is required, which can be obtained by seismic refraction survey. However, land seismic data is often acquired in a limited form of geometry depending on the equipment availability, accessibility condition, and permission for the survey site. In this situation, refraction analysis should be performed using reflection data because it is impossible to acquire refraction-oriented data due to limited source and receiver geometry. In this study, we aimed to analyze the reliability of the results obtained by refraction traveltime tomography when using reflection data with a limited number of sources and receivers from irregular surface topography. By comparing the inversion result from irregular topography with that from flat surface, we found that the surface topography affects the reliability of the inversion results to some degree. We also found that the number of sources has little effect on the inversion results unless the number of sources are very small. On the other hand, we observed that velocity distortion occurred in the overlapped part of receiver arrays when using a limited number of receivers, and therefore suggested the size of the least overlapping ratio to avoid the velocity distortion. Finally, we performed numerical tests for the model which simulates the surface topography and acquisition geometry of the survey region and verified the reliability analysis of inversion results. We identified reliable areas and suspicious area of the inverted velocity model by applying the analysis results to field data.
Keywords
refraction traveltime tomography; topography; static correction; refraction method; land seismic;
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Times Cited By KSCI : 2  (Citation Analysis)
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