Item talk:Q308396
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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "P- and S-wave velocity estimation by ensemble Kalman inversion of dispersion data for strong motion stations in California", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70236349", "url": "https://pubs.usgs.gov/publication/70236349" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70236349 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1093/gji/ggac201", "url": "https://doi.org/10.1093/gji/ggac201" } ], "journal": { "@type": "Periodical", "name": "Geophysical Journal International", "volumeNumber": "231", "issueNumber": "1" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Geophysical Journal International" } ], "datePublished": "2022", "dateModified": "2022-09-02", "abstract": "This study uses an ensemble Kalman method for near-surface seismic site characterization of 154 network earthquake monitoring stations in California to improve the resolution of\u00a0S-wave velocity (VS) and\u00a0P-wave velocity (VP) profiles\u2014up to the resolution depth\u2014coupled with better quantification of uncertainties compared to previous site characterization studies at this network. These stations were part of the Yong\u00a0et\u00a0al. site characterization project, with selected stations based on future recordings of ground motions that are expected to exceed 10\u00a0per\u00a0cent peak ground acceleration in 50\u00a0yr. To estimate\u00a0VS\u00a0and\u00a0VP\u00a0from experimental dispersion data, Yong\u00a0et\u00a0al. investigated these stations using linearized (local search and iteration) routines, and Yong\u00a0et\u00a0al. later studied a subset of these stations using nonlinear (global search and optimization) routines. In both studies, the selection of model parameters\u2014that is, discretization of the\u00a0VS\u00a0and\u00a0VP\u00a0profiles with only five fixed thickness layers\u2014was mainly based on trial and error. In contrast, this paper uses an approximate Bayesian method to assimilate experimental dispersion data and sequentially update an ensemble of particle estimates that span the\u00a0VS\u00a0and\u00a0VP\u00a0parameter spaces. Doing so, we systematically determine the most probable profiles conditioned on the experimental dispersion data, the introduced noise levels, and\u00a0a priori\u00a0knowledge in the form of physical constraints. We consider two configurations to discretize the soil depth from the surface to half of the maximum discernible wavelength obtained from the experimental dispersion data, namely refined and coarse models, and two initial models for each configuration to study solution multiplicity. Our results suggest that using the refined model for the top surface layers improves the resolution of near-surface site characteristics and the model\u2019s success rate in capturing dispersion data at high frequencies. All models result in similar\u00a0VS\u00a0but distinct\u00a0VP\u00a0profiles, with increasing uncertainty at deeper layers, suggesting that the fundamental mode of Rayleigh wave dispersion data is not adequate to constrain the\u00a0P-wave velocity profile and the\u00a0S-wave velocity close to the resolution depth.", "description": "16 p.", "publisher": { "@type": "Organization", "name": "Oxford Academic" }, "author": [ { "@type": "Person", "name": "Bas, Elif Ecem", "givenName": "Elif Ecem", "familyName": "Bas", "affiliation": [ { "@type": "Organization", "name": "University of Nevada, Reno" } ] }, { "@type": "Person", "name": "Seylabi, Elnaz", "givenName": "Elnaz", "familyName": "Seylabi", "affiliation": [ { "@type": "Organization", "name": "University of Nevada, Reno" } ] }, { "@type": "Person", "name": "Asimaki, Domniki", "givenName": "Domniki", "familyName": "Asimaki", "affiliation": [ { "@type": "Organization", "name": "California Institute of Technology" } ] }, { "@type": 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