Multimode inversion of Rayleigh waves using vertical and horizontal component data

Tatsunori Ikeda, Toshifumi Matsuoka, Takeshi Tsuji, Toru Nakayama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Multimode inversion of surface waves improves S-wave velocity estimations. In surface wave analysis, only vertical components of the P-SV wavefield have been conventionally used to extract multimode Rayleigh waves. In this study, horizontal components of the P-SV waves were analyzed to extract additional mode information of Rayleigh waves. First, we extracted Rayleigh waves from vertical and horizontal components of the numerically synthesized P-SV waves. Additional mode information of Rayleigh waves could be obtained from horizontal component data. We then estimated S-wave velocity structures by multimode inversion using a genetic algorithm. Inclusion of dispersion curves from horizontal component data improved the investigation depth of S-wave velocity estimation. Next, multimode Rayleigh waves were extracted from three-component seismic data acquired in Alberta, Canada. By including dispersion curves from horizontal component data, which have different mode information from those from vertical component data, the inverted S-wave velocity structures agreed well with logging data for deeper layer. Therefore, inclusion of horizontal component data of the P-SV wavefield makes it possible to extract additional mode information of Rayleigh waves, thus eliminating ambiguity from S-wave velocity estimations in multimode inversions.

    Original languageEnglish
    Title of host publicationSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013
    Subtitle of host publicationExpanding Geophysical Frontiers
    PublisherSociety of Exploration Geophysicists
    Pages1782-1787
    Number of pages6
    ISBN (Print)9781629931883
    DOIs
    Publication statusPublished - 2013
    EventSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013 - Houston, United States
    Duration: Sep 22 2013Sep 27 2013

    Publication series

    NameSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting, SEG 2013: Expanding Geophysical Frontiers

    Other

    OtherSociety of Exploration Geophysicists International Exposition and 83rd Annual Meeting: Expanding Geophysical Frontiers, SEG 2013
    Country/TerritoryUnited States
    CityHouston
    Period9/22/139/27/13

    All Science Journal Classification (ASJC) codes

    • Geophysics

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