An assessment of uncertainties in <i>V</i><sub>S</sub> profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials

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dc.contributor.authorAsten, Michael W.
dc.contributor.authorYong, Alan
dc.contributor.authorFoti, Sebastiano
dc.contributor.authorHayashi, Koichi
dc.contributor.authorMartin, Antony J.
dc.contributor.authorStephenson, William J.
dc.contributor.authorCassidy, John F.
dc.contributor.authorColeman, Jacie
dc.contributor.authorNigbor, Robert
dc.contributor.authorCastellaro, Silvia
dc.contributor.authorChimoto, Kosuke
dc.contributor.authorCornou, Cecile
dc.contributor.authorCho, Ikuo
dc.contributor.authorHayashida, Takumi
dc.contributor.authorHobiger, Manuel
dc.contributor.authorKuo, Chun-Hsiang
dc.contributor.authorMacau, Albert
dc.contributor.authorMercerat, E. Diego
dc.contributor.authorMolnar, Sheri
dc.contributor.authorPananont, Passakorn
dc.contributor.authorPilz, Marco
dc.contributor.authorPoovarodom, Nakhorn
dc.contributor.authorSaez, Esteban
dc.contributor.authorWathelet, Marc
dc.contributor.authorYamanaka, Hiroaki
dc.contributor.authorYokoi, Toshiaki
dc.contributor.authorZhao, Don
dc.date.accessioned2025-01-20T21:08:35Z
dc.date.available2025-01-20T21:08:35Z
dc.date.issued2022
dc.description.abstractSite response is a critical consideration when assessing earthquake hazards. Site characterization is key to understanding site effects as influenced by seismic site conditions of the local geology. Thus, a number of geophysical site characterization methods were developed to meet the demand for accurate and cost-effective results. As a consequence, a number of studies have been administered periodically as blind trials to evaluate the state-of-practice on-site characterization. We present results from the Consortium of Organizations for Strong Motion Observation Systems (COSMOS) blind trials, which used data recorded from surface-based microtremor array methods (MAM) at four sites where geomorphic conditions vary from deep alluvial basins to an alpine valley. Thirty-four invited analysts participated. Data were incrementally released to 17 available analysts who participated in all four phases: (1) two-station arrays, (2) sparse triangular arrays, (3) complex nested triangular or circular arrays, and (4) all available geological control site information including drill hole data. Another set of 17 analysts provided results from two sites and two phases only. Although data from one site consisted of recordings from three-component sensors, the other three sites consisted of data recorded only by vertical-component sensors. The sites cover a range of noise source distributions, ranging from one site with a highly directional microtremor wave field to others with omni-directional (azimuthally distributed) wave fields. We review results from different processing techniques (e.g., beam-forming, spatial autocorrelation, cross-correlation, or seismic interferometry) applied by the analysts and compare the effectiveness between the differing wave field distributions. We define the M index as a quality index based on estimates of the time-averaged shear-wave velocity of the upper 10 (V-S10), 30 (V-S30), 100 (V-S100), and 300 (V-S300) meters and show its usefulness in quantitative comparisons of V-S profiles from multiple analysts. Our findings are expected to aid in building an evidence-based consensus on preferred cost-effective arrays and processing methodology for future studies of seismic site effects.
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10950-021-10059-4
dc.identifier.eissn1573-157X
dc.identifier.issn1383-4649
dc.identifier.urihttps://doi.org/10.1007/s10950-021-10059-4
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93481
dc.identifier.wosidWOS:000785597500001
dc.issue.numero4
dc.language.isoen
dc.pagina.final780
dc.pagina.inicio757
dc.revistaJournal of seismology
dc.rightsacceso restringido
dc.subjectCOSMOS guidelines
dc.subjectMicrotremor
dc.subjectPassive seismic
dc.subjectAmbient noise seismic
dc.subjectArray
dc.subjectSPAC
dc.subjectBeam-forming
dc.subjectSeismic interferometry
dc.subjectCross-correlation
dc.subjectEarthquake site hazard
dc.subjectV-S profiles
dc.subjectCover thickness
dc.subjectM index
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleAn assessment of uncertainties in <i>V</i><sub>S</sub> profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials
dc.typeartículo
dc.volumen26
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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