Fukushima and Tanaka 1990

class openquake.hazardlib.gsim.fukushima_tanaka_1990.FukushimaTanaka1990

Implements the PGA GMPE of Fukushima and Tanaka (1990) Fukushima, Y. and Tanaka, T. (1990) A New Attenuation Relation for Peak Horizontal Acceleration of Strong Earthquake Ground Motion in Japan. Bulletin of the Seismological Society of America, 80(4), 757 - 783

DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = 'Average horizontal'

Supported intensity measure component is the average horizontal component openquake.hazardlib.const.IMC.AVERAGE_HORIZONTAL,

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

Supported intensity measure types are peak ground acceleration

DEFINED_FOR_STANDARD_DEVIATION_TYPES = set(['Total'])

Supported standard deviation types is total.

DEFINED_FOR_TECTONIC_REGION_TYPE = 'Active Shallow Crust'

The GMPE is derived from shallow earthquakes in California and Japan

REQUIRES_DISTANCES = set(['rrup'])

Required distance measure is rupture distance

REQUIRES_RUPTURE_PARAMETERS = set(['mag'])

Required rupture parameters are magnitude

REQUIRES_SITES_PARAMETERS = set([])

Required site parameters. The GMPE was developed for an ‘’average’’ site conditions. The authors specify that for rock sites the values should be lowered by 40 % and for soil site they should be raised by 40 %. For greatest consistencty the site condition is neglected currently but a site-dependent GMPE may be implemented inside a subclass.

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

See superclass method for spec of input and result values.

class openquake.hazardlib.gsim.fukushima_tanaka_1990.FukushimaTanakaSite1990

Implements the Fukushima and Tanaka (1990) model correcting for site class. The authors specify that the ground motions should be raised by 40 % on soft soil sites and reduced by 40 % on rock sites. The specific site classification is not known, so it is assumed that in this context “average” site conditions refer to NEHRP C, rock conditions to NEHRP A and B, and soft soil conditions to NEHRP D and E

REQUIRES_SITES_PARAMETERS = set(['vs30'])

Input sites as vs30 although only three classes considered

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

See superclass method for spec of input and result values.