An explicit time evolution method for acoustic wave propagation

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dc.citation.firstpageT117en_US
dc.citation.issueNumber3en_US
dc.citation.journalTitleGeophysicsen_US
dc.citation.lastpageT124en_US
dc.citation.volumeNumber79en_US
dc.contributor.authorLiu, Huafengen_US
dc.contributor.authorDai, Nanxunen_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorWu, Weien_US
dc.date.accessioned2014-03-28T21:55:02Zen_US
dc.date.available2014-03-28T21:55:02Zen_US
dc.date.issued2014en_US
dc.description.abstractCost-effective waveform modeling is the key to practical reverse time migration (RTM) and full-waveform inversion (FWI) implementations. We evaluated an explicit time evolution (ETE) method to efficiently simulate wave propagation in acoustic media with high temporal accuracy. We started from the constant-density acoustic wave equation and obtained an analytical time-marching scheme in the wave number domain. We then formulated an ETE scheme in the time-space domain by introducing a cosine function approximation. Although the ETE operator appears to be similar to the second-order temporal finite-difference (FD) operator, the exact nature of the ETE formula ensures high accuracy in time. We further introduced a set of optimum stencils and coefficients by minimizing evolution errors in a least-squares sense. Our numerical tests indicated that ETE can achieve similar waveform accuracy as FD with four times larger time steps. Meanwhile, the compact ETE operator keeps the computation efficient. The efficiency and capability to handle complex velocity field make ETE an attractive engine in acoustic RTM and FWI.en_US
dc.identifier.citationLiu, Huafeng, Dai, Nanxun, Niu, Fenglin, et al.. "An explicit time evolution method for acoustic wave propagation." <i>Geophysics,</i> 79, no. 3 (2014) Society of Exploration Geophysicists: T117-T124. http://dx.doi.org/10.1190/GEO2013-0073.1.en_US
dc.identifier.doihttp://dx.doi.org/10.1190/GEO2013-0073.1en_US
dc.identifier.urihttps://hdl.handle.net/1911/75786en_US
dc.language.isoengen_US
dc.publisherSociety of Exploration Geophysicistsen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleAn explicit time evolution method for acoustic wave propagationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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