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  An assessment of uncertainties in VS profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials

Asten, M. W., Yong, A., Foti, S., Hayashi, K., Martin, A. J., Stephenson, W. J., Cassidy, J. F., Coleman, J., Nigbor, R., Castellaro, S., Chimoto, K., Cornou, C., Cho, I., Hayashida, T., Hobiger, M., Kuo, C.-H., Macau, A., Mercerat, E. D., Molnar, S., Pananont, P., Pilz, M., Poovarodom, N., Sáez, E., Wathelet, M., Yamanaka, H., Yokoi, T., Zhao, D. (2022 online): An assessment of uncertainties in VS profiles obtained from microtremor observations in the phased 2018 COSMOS blind trials. - Journal of Seismology.

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Asten, Michael W.1, Author
Yong, Alan1, Author
Foti, Sebastiano1, Author
Hayashi, Koichi1, Author
Martin, Antony J.1, Author
Stephenson, William J.1, Author
Cassidy, John F.1, Author
Coleman, Jacie1, Author
Nigbor, Robert1, Author
Castellaro, Silvia1, Author
Chimoto, Kosuke1, Author
Cornou, Cécile1, Author
Cho, Ikuo1, Author
Hayashida, Takumi1, Author
Hobiger, Manuel1, Author
Kuo, Chun-Hsiang1, Author
Macau, Albert1, Author
Mercerat, E. Diego1, Author
Molnar, Sheri1, Author
Pananont, Passakorn1, Author
Pilz, M.2, Author              Poovarodom, Nakhorn1, AuthorSáez, Esteban1, AuthorWathelet, Marc1, AuthorYamanaka, Hiroaki1, AuthorYokoi, Toshiaki1, AuthorZhao, Don1, Author more..
1External Organizations, ou_persistent22              
22.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146032              


Free keywords: OPEN ACCESS. COSMOS guidelines · Microtremor · Passive seismic · Ambient noise seismic · Array · SPAC · Beam-forming · Seismic interferometry · Cross-correlation · Earthquake site hazard · VS profiles · Cover thickness · M index
 Abstract: Site 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 (VS10), 30 (VS30), 100 (VS100), and 300 (VS300) meters and show its usefulness in quantitative comparisons of VS 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.


Language(s): eng - English
 Dates: 2022-01-01
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1007/s10950-021-10059-4
GFZPOF: p4 T3 Restless Earth
 Degree: -



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Title: Journal of Seismology
Source Genre: Journal, SCI, Scopus
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals303
Publisher: Springer Nature