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Refraction traveltime tomography using damped monochromatic wavefield
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Pyun, Sukjoon | - |
dc.contributor.author | Shin, Changsoo | - |
dc.contributor.author | Min, Dong-Joo | - |
dc.contributor.author | Ha, Taeyoung | - |
dc.date.accessioned | 2009-08-03T23:29:20Z | - |
dc.date.available | 2009-08-03T23:29:20Z | - |
dc.date.issued | 2005-03-22 | - |
dc.identifier.citation | Geophysics, 70, U1-U7 | en |
dc.identifier.issn | 0016-8033 | - |
dc.identifier.uri | https://hdl.handle.net/10371/6108 | - |
dc.description.abstract | For complicated earth models, wave-equation–based
refraction-traveltime tomography is more accurate than ray-based tomography but requires more computational effort. Most of the computational effort in traveltime tomography comes from computing traveltimes and their Fr´echet derivatives, which for ray-based methods can be computed directly. However, in most wave-equation traveltime-tomography algorithms, the steepest descent direction of the objective function is computed by the backprojection algorithm, without computing a Fr ´echet derivative directly. We propose a new wave-based refraction-traveltime– tomography procedure that computes Fr´echet derivatives directly and efficiently. Our method involves solving a damped-wave equation using a frequency-domain, finite-element modeling algorithm at a single frequency and invoking the reciprocity theorem. A damping factor, which is commonly used to suppress wraparound effects in frequency-domain modeling, plays the role of suppressing multievent wavefields. By limiting the wavefield to a single first arrival, we are able to extract the first-arrival traveltime from the phase term without applying a time window. Computing the partial derivative of the damped wave-equation solution using the reciprocity theorem enables us to compute the Fr ´echet derivative of amplitude, as well as that of traveltime, with respect to subsurface parameters. Using the Marmousi-2 model, we demonstrate numerically that refraction traveltime tomography with large-offset data can be used to provide the smooth initial velocity model necessary for prestack depth migration. | en |
dc.description.sponsorship | This work was financially supported by the National Laboratory
Project of the Ministry of Science and Technology and the Brain Korea 21 project of the Ministry of Education. We are also grateful to Prof. K. J. Marfurt of the University of Houston and Dr. M. Schoenberger for editing our manuscript. | en |
dc.language.iso | en | en |
dc.publisher | Society of Exploration Geophysicists (SEG) | en |
dc.subject | Wavefield | en |
dc.subject | tomography | en |
dc.subject | traveltime | en |
dc.subject | damped monochromatic wavefiled | en |
dc.title | Refraction traveltime tomography using damped monochromatic wavefield | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 편석준 | - |
dc.contributor.AlternativeAuthor | 신창수 | - |
dc.contributor.AlternativeAuthor | 민동주 | - |
dc.contributor.AlternativeAuthor | 하태영 | - |
dc.identifier.doi | 10.1190/1.1884829 | - |
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