Sadigh et. al. 1997

class openquake.hazardlib.gsim.sadigh_1997.SadighEtAl1997

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.

COEFFS_ROCK_HIMAG = <openquake.hazardlib.gsim.base.CoeffsTable object>

Coefficients tables for rock sites (table 2), for magnitude values above NEAR_FIELD_SATURATION_MAG.

COEFFS_ROCK_LOWMAG = <openquake.hazardlib.gsim.base.CoeffsTable object>

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.

COEFFS_ROCK_STDDERR = <openquake.hazardlib.gsim.base.CoeffsTable object>

Coefficient tables for standard error on rock sites (table 3).

COEFFS_SOIL = <openquake.hazardlib.gsim.base.CoeffsTable object>

Coefficient tables for deep soil sites (table 4).

COEFFS_SOIL_IMT_INDEPENDENT = {'c4lowmag': 2.1863, 'c4himag': 0.3825, 'c1ss': -2.17, 'c2': 1.0, 'c3': 1.7, 'c1r': -1.92, 'c5himag': 0.5882, 'c5lowmag': 0.32}

IMT-independent coefficients for deep soil sites (table 4).

DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = 'Average horizontal'

Supported intensity measure component is the geometric mean of attr:~openquake.hazardlib.const.IMC.AVERAGE_HORIZONTAL, : see

DEFINED_FOR_INTENSITY_MEASURE_TYPES = set([<class 'openquake.hazardlib.imt.SA'>, <class 'openquake.hazardlib.imt.PGA'>])

Supported intensity measure types are spectral acceleration, and peak ground acceleration, see page 180.

DEFINED_FOR_STANDARD_DEVIATION_TYPES = set(['Total'])

Supported standard deviation type is only total, see table 3.

DEFINED_FOR_TECTONIC_REGION_TYPE = 'Active Shallow Crust'

Supported tectonic region type is active shallow crust, since data consists of California earthquakes mainly.

NEAR_FIELD_SATURATION_MAG = 6.5

Magnitude value to separate coefficients table because of near field saturation effect is 6.5. See page 184.

REQUIRES_DISTANCES = set(['rrup'])

Required distance measure is RRup (eq. 1).

REQUIRES_RUPTURE_PARAMETERS = set(['rake', 'mag'])

Required rupture parameters are magnitude and rake (eq. 1).

REQUIRES_SITES_PARAMETERS = set(['vs30'])

Required site parameter is only Vs30 (used to distinguish rock and deep soil).

ROCK_VS30 = 750

If site vs30 is more than 750 m/s – treat the soil as rock. See page 180.

get_mean_and_stddevs(sites, rup, dists, imt, stddev_types)

See superclass method for spec of input and result values.