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Procedures for Selecting Earthquake Ground Motions at Rock Sites.

pdf icon Procedures for Selecting Earthquake Ground Motions at Rock Sites. (1376 K)
Idriss, I. M.

NIST GCR 93-625; 35 p. April 1993.


National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB93-185973


earthquakes; acceleration response spectrum; attenuation relationships; earthquake ground motions


To estimate the spectral ordinates at a rock site for an earthquake having a given size (magnitude) and occurring at a specified distance from the site, available attenuation relationships are used. These relationships, which have been developed based on available recorded data and typically are for a spectral damping of 5%, provide estimates of the median spectral ordinates and a measure of the dispersion about the median. Four currently available relationships are summarized in this report. These relationships are those derived by Campbell (1990), Geomatrix (1991), Idriss (1991) and Joyner and Boore (1988). The equations to be used in conjunction with each relationship together with the description and the numerical values of the coefficients pertinent to that relationship are given.