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• W4231854301 abstract "PreviousNext You have accessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2014IMPROVEMENTS TO THE NEAR SURFACE VELOCITY MODEL OF THE EAST SAN FRANCISCO BAY AREA USING SURFACE WAVE METHODSAuthors: Mitchell CraigRania AqlSeth ShulerKoichi HayashiMitchell CraigCalifornia State University, East BaySearch for more papers by this author, Rania AqlCalifornia State University, East BaySearch for more papers by this author, Seth ShulerCalifornia State University, East BaySearch for more papers by this author, and Koichi HayashiSearch for more papers by this authorhttps://doi.org/10.4133/SAGEEP.27-140 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We conducted active and passive shear-wave velocity (VS) surveys at several locations in the East San Francisco Bay Area for seismic hazard assessment. Active and passive surveys were recorded to determine near-surface velocity structure using a 48-channel linear array. Additional passive surveys to determine deeper structure were performed using a 2-station SPAC (spatial autocorrelation) method with larger offsets and longer records. VS was determined to depths of ~20 m using the active method with linear array, ~40 m using the passive method with linear array, and ~2000 m using a 2-station SPAC (spatial autocorrelation) method. Active and passive data were combined to produce a composite dispersion curve for each site, and dispersion curves were inverted to provide S-wave velocity profiles. The maximum depth of velocity profiles ranged from ~200 to 2000 m, depending on the site. VS profiles were highly site dependent. At valley floor sites, a surface layer ~100 m thick with VS ~700 m/s was underlain by a second layer with VS ranging from 700 to 1500 m/s. Bedrock with VS > ~1500 m/s was found at depths greater than ~1700 m. At sites in the East Bay hills, the first two layers were considerably thinner, with depth to bedrock less than 250 m. These results are consistent with thicker sediments in the valleys and thinner sediments on the uplifted fault block that comprises the East Bay hills. Keywords: seismic, surface wave, shear wave, velocityPermalink: https://doi.org/10.4133/SAGEEP.27-140FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014ISSN (online):1554-8015Copyright: 2014 Pages: 559 publication data© 2014 Published in electronic format with permission by the Society of Exploration Geophysicists and Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 25 Aug 2014 CITATION INFORMATION Mitchell Craig, Rania Aql, Seth Shuler, and Koichi Hayashi, (2014), IMPROVEMENTS TO THE NEAR SURFACE VELOCITY MODEL OF THE EAST SAN FRANCISCO BAY AREA USING SURFACE WAVE METHODS, Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 403-403. https://doi.org/10.4133/SAGEEP.27-140 Plain-Language Summary Keywordsseismicsurface waveshear wavevelocityPDF DownloadLoading ..." @default.
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• W4231854301 title "IMPROVEMENTS TO THE NEAR SURFACE VELOCITY MODEL OF THE EAST SAN FRANCISCO BAY AREA USING SURFACE WAVE METHODS" @default.
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