Coherency analysis of accelerograms recorded by the UPSAR array during the 2004 Parkfield earthquake

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Spatial variability of near-fault strong motions recorded by the US Geological Survey Parkfield Seismograph Array (UPSAR) during the 2004 Parkfield (California) earthquake is investigated. Behavior of the lagged coherency for two horizontal and the vertical components is analyzed by separately examining the decay of coherency with frequency and distance. Assumptions, approximations, and challenges that are involved in estimation of the coherency from recorded data are presented in detail. Comparison of the UPSAR coherency estimates with coherency models that are commonly used in engineering practice sheds light on the advantages and limitations of different approaches to modeling the coherency, as well as on similarities and differences in the spatial variability exhibited by seismic ground motion arrays at different sites. © 2013 John Wiley & Sons, Ltd.
Original languageEnglish
JournalEarthquake Engineering and Structural Dynamics
Issue number5
Pages (from-to)641-659
Number of pages19
Publication statusPublished - 2014
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Coherency estimation, Ground motion array, Lagged coherency, Spatial variability
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ID: 103528133