Implements GMPE developed by Sadigh, K., C. -Y. Chang, J. A. Egan, F. Makdisi, and R. R. Youngs (1997) and published as “Attenuation relationships for shallow crustal earthquakes based on California strong motion data”, Seismological Research Letters, 68(1), 180-189.
Coefficients tables for rock sites (table 2), for magnitude values above NEAR_FIELD_SATURATION_MAG.
Coefficients tables for rock sites (table 2), for magnitude values of NEAR_FIELD_SATURATION_MAG and below. Damping for spectral acceleration here and in other SA-tables is 5%, see “introduction” section.
Coefficient tables for standard error on rock sites (table 3).
Coefficient tables for deep soil sites (table 4).
IMT-independent coefficients for deep soil sites (table 4).
Supported intensity measure component is the geometric mean of attr:~openquake.hazardlib.const.IMC.AVERAGE_HORIZONTAL, : see
Supported intensity measure types are spectral acceleration, and peak ground acceleration, see page 180.
Supported standard deviation type is only total, see table 3.
Supported tectonic region type is active shallow crust, since data consists of California earthquakes mainly.
Magnitude value to separate coefficients table because of near field saturation effect is 6.5. See page 184.
Required distance measure is RRup (eq. 1).
Required rupture parameters are magnitude and rake (eq. 1).
Required site parameter is only Vs30 (used to distinguish rock and deep soil).
If site vs30 is more than 750 m/s – treat the soil as rock. See page 180.