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 | - |