Earthquakes and Structures

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Correlation of response spectral values in Japanese ground motions

  • Jayaram, Nirmal (Department of Civil and Environmental Engineering, Stanford University) ;
  • Baker, Jack W. (Department of Civil and Environmental Engineering, Stanford University) ;
  • Okano, Hajime (Kajima Corporation) ;
  • Ishida, Hiroshi (Kajima Corporation) ;
  • McCann, Martin W. Jr. (Department of Civil and Environmental Engineering, Stanford University) ;
  • Mihara, Yoshinori (Kajima Corporation)
  • Received : 2010.07.14
  • Accepted : 2011.05.11
  • Published : 2011.12.25
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Abstract

Ground motion models predict the mean and standard deviation of the logarithm of spectral acceleration, as a function of predictor variables such as earthquake magnitude, distance and site condition. Such models have been developed for a variety of seismic environments throughout the world. Some calculations, such as the Conditional Mean Spectrum calculation, use this information but additionally require knowledge of correlation coefficients between logarithmic spectral acceleration values at multiple periods. Such correlation predictions have, to date, been developed primarily from data recorded in the Western United States from active shallow crustal earthquakes. This paper describes results from a study of spectral acceleration correlations from Japanese earthquake ground motion data that includes both crustal and subduction zone earthquakes. Comparisons are made between estimated correlations for Japanese response spectral ordinates and correlation estimates developed from Western United States ground motion data. The effect of ground motion model, earthquake source mechanism, seismic zone, site conditions, and source to site distance on estimated correlations is evaluated and discussed. Confidence intervals on these correlation estimates are introduced, to aid in identifying statistically significant differences in correlations among the factors considered. Observed general trends in correlation are similar to previous studies, with the exception of correlation of spectral accelerations between orthogonal components, which is seen to be higher here than previously observed. Some differences in correlations between earthquake source zones and earthquake mechanisms are observed, and so tables of correlations coefficients for each specific case are provided.

Keywords

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