Refraction traveltime tomography using damped monochromatic wavefield SCIE SCOPUS

DC Field Value Language
dc.contributor.author Pyun, S -
dc.contributor.author Shin, C -
dc.contributor.author Min, DJ -
dc.contributor.author Ha, T -
dc.date.accessioned 2020-04-20T14:25:20Z -
dc.date.available 2020-04-20T14:25:20Z -
dc.date.created 2020-01-28 -
dc.date.issued 2005-03 -
dc.identifier.issn 0016-8033 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/5092 -
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 Frechet 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 Frechet derivative directly. We propose a new wave-based refraction-traveltime-tomography procedure that computes Frechet 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-do main 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 Frechet 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. -
dc.description.uri 1 -
dc.language English -
dc.publisher SOC EXPLORATION GEOPHYSICISTS -
dc.subject RAY TOMOGRAPHY -
dc.subject INVERSION -
dc.subject MIGRATION -
dc.title Refraction traveltime tomography using damped monochromatic wavefield -
dc.type Article -
dc.citation.endPage U7 -
dc.citation.startPage U1 -
dc.citation.title GEOPHYSICS -
dc.citation.volume 70 -
dc.citation.number 2 -
dc.contributor.alternativeName 민동주 -
dc.identifier.bibliographicCitation GEOPHYSICS, v.70, no.2, pp.U1 - U7 -
dc.identifier.doi 10.1190/1.1884829 -
dc.identifier.scopusid 2-s2.0-17944377701 -
dc.identifier.wosid 000228275700017 -
dc.type.docType Article -
dc.description.journalClass 1 -
dc.subject.keywordPlus RAY TOMOGRAPHY -
dc.subject.keywordPlus INVERSION -
dc.subject.keywordPlus MIGRATION -
dc.relation.journalWebOfScienceCategory Geochemistry & Geophysics -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.relation.journalResearchArea Geochemistry & Geophysics -
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