Simulation of microtremor exploration using 3D finite-difference method to study the effect of velocity anomaly on the observed phase velocity

PreviousNext No AccessProceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021Simulation of microtremor exploration using 3D finite-difference method to study the effect of velocity anomaly on the observed phase velocityAuthors: Haruhiko SuzukiKoichi HayashiChisato KonishiHaruhiko SuzukiOYO CorporationSearch for more papers by this author, Koichi HayashiOYO CorporationSearch for more papers by this author, and Chisato KonishiOYO CorporationSearch for more papers by this authorhttps://doi.org/10.1190/segj2021-089.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We performed a simulation of microtremor exploration using three-dimensional finite difference method to study the effect of the cavities and concrete structure in underground. A subsurface structural model including the cavity and concrete structure with a horizontal direction of 550m and a vertical direction of 180m was creted. The vertical grid size is 1m from the surface to the depth of 70m, and 2m from the depth of 70m to 180m. The sources of the microtremors were placed on the circumference of a circle with a radius of 250m from the center of model. The peak frequency of the source spectra was set to 2Hz and random phase was given. The effect of the velocity structure anomaly appeared on the phase velocity when the depth of the velocity anomaly was similar to the size of the cavity or concrete structure. Keywords: microtremor array, finite-difference method, phase velocity, S-wave velocityPermalink: https://doi.org/10.1190/segj2021-089.1FiguresReferencesRelatedDetails Proceedings of the 14th SEGJ International Symposium, Online, 18–21 October 2021ISSN (online):2159-6832Copyright: 2021 Pages: 349 publication data© 2021 Published in electronic format with permission by the Society of Exploration Geophysicists of JapanPublisher:Society of Exploration GeophysicistsSociety of Exploration Geophysicists of Japan HistoryPublished Online: 29 Nov 2021 CITATION INFORMATION Haruhiko Suzuki, Koichi Hayashi, and Chisato Konishi, (2021), "Simulation of microtremor exploration using 3D finite-difference method to study the effect of velocity anomaly on the observed phase velocity," SEG Global Meeting Abstracts : 339-341. https://doi.org/10.1190/segj2021-089.1 Plain-Language Summary Keywordsmicrotremor arrayfinite-difference methodphase velocityS-wave velocityPDF DownloadLoading ...