The Halls Valley Site

• Geologic Log (download) : Geologic Log at the site is given. The log can be downloaded in an html format.

• Shear Wave Velocity Profile (download) : Small strain shear wave velocity profile at the site is given. The profile is given in an excel-sheet and can be downloaded.

• Recorded Motions:

  • Coyote Lake 1979 (download) :

      "download" link has the recorded motion at the site for the corresponding earthquake (i.e. Coyote Lake for this link), selected input motions and an information excel-sheet. The input motions are scaled such that the median spectral acceleration of all the motions matches the rock spectrum from Abrahamson and Silva (1997) attenuation  relationship for the subject earthquake. All the input motion files have the same format. There is no header line in the files. The time step for the input motions are 0.02 sec and the format is (8e16.7).

  • Morgan Hill 1984 (download)

  • Loma Prieta 1989 (download)

• SHAKE91 Results:

  • Coyote Lake 1979

      During the process of site selection for calibration of nonlinear models, ground response analysis were performed for each motion using SHAKE91. Each site was modeled using the geologic log and shear wave velocity profile given here. The results of SHAKE analysis and Abrahamson and Silva (1997) attenuation relationship estimates  are plotted against the actual recording at the site. The differences between the estimates and the recordings are also calculated (residuals). The plots can be seen following the "Coyote Lake 1979" link.

  • Morgan Hill 1984

  • Loma Prieta 1989