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Open-File Report 96-532

National Seismic Hazard Maps: Documentation June 1996

By Arthur Frankel, Charles Mueller, Theodore Barnhard, David Perkins, E.V. Leyendecker, Nancy Dickman, Stanley Hanson, and Margaret Hopper

TORO ET AL. (1993) MOTIONS

The ground motions for Toro et al. (1993) are for a hard-rock site, with kappa = 0.006. Modification factors to convert their values to a firm-rock site were developed by first computing motions using the stochastic model discussed above, but with hard-rock site amplifications and kappa = 0.006, and then forming the ratio of these motions with those from the firm-rock model discussed above at each magnitude, distance, and oscillator period. (The input parameters for the hard-rock calculations are given in Table A7; the shallow shear-wave velocity profile is shown in Figure A1). For a given oscillator period these ratios are generally independent of magnitude and distance, and we have applied magnitude- and distance-independent factors to the Toro et al hard-rock values (see main text)

 

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