Source code for openquake.hazardlib.gsim.bommer_2009

# -*- coding: utf-8 -*-
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"""
Module exports :class:`BommerEtAl2009RSD`
"""
import numpy as np

from openquake.hazardlib.gsim.base import CoeffsTable, GMPE
from openquake.hazardlib import const
from openquake.hazardlib.imt import RSD595, RSD575


[docs]def get_magnitude_term(C, mag): """ Returns linear magnitude scaling term """ return C["c0"] + C["m1"] * mag
[docs]def get_distance_term(C, rrup, mag): """ Returns distance scaling term """ return (C["r1"] + C["r2"] * mag) *\ np.log(np.sqrt(rrup ** 2. + C["h1"] ** 2.))
[docs]def get_ztor_term(C, ztor): """ Returns depth to top of rupture scaling """ return C["z1"] * ztor
[docs]def get_site_amplification(C, vs30): """ Returns linear site amplification term """ return C["v1"] * np.log(vs30)
[docs]def get_stddevs(C): """ Returns the standard deviations """ return [np.sqrt(C["tau"] ** 2. + C["phi"] ** 2.), C["tau"], C["phi"]]
[docs]class BommerEtAl2009RSD(GMPE): """ Implements the GMPE of Bommer et al. (2009) for significant duration with 5 - 75 % Arias Intensity and 5 - 95 % Arias Intensity """ #: Supported tectonic region type is active shallow crust DEFINED_FOR_TECTONIC_REGION_TYPE = const.TRT.ACTIVE_SHALLOW_CRUST #: Supported intensity measure types are 5 - 95 % Arias and 5 - 75 % Arias #: significant duration DEFINED_FOR_INTENSITY_MEASURE_TYPES = {RSD595, RSD575} #: Supported intensity measure component is the geometric mean horizontal #: component DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = const.IMC.AVERAGE_HORIZONTAL #: Supported standard deviation type is only total, see table 7, page 35 DEFINED_FOR_STANDARD_DEVIATION_TYPES = { const.StdDev.TOTAL, const.StdDev.INTER_EVENT, const.StdDev.INTRA_EVENT} #: Requires vs30 REQUIRES_SITES_PARAMETERS = {'vs30'} #: Required rupture parameters are magnitude and top of rupture depth REQUIRES_RUPTURE_PARAMETERS = {'mag', 'ztor'} #: Required distance measure is closest distance to rupture REQUIRES_DISTANCES = {'rrup'}
[docs] def compute(self, ctx, imts, mean, sig, tau, phi): """ See :meth:`superclass method <.base.GroundShakingIntensityModel.compute>` for spec of input and result values. """ for m, imt in enumerate(imts): C = self.COEFFS[imt] mean[m] = (get_magnitude_term(C, ctx.mag) + get_distance_term(C, ctx.rrup, ctx.mag) + get_ztor_term(C, ctx.ztor) + get_site_amplification(C, ctx.vs30)) sig[m], tau[m], phi[m] = get_stddevs(C)
COEFFS = CoeffsTable(sa_damping=5, table="""\ imt c0 m1 r1 r2 h1 v1 z1 tau phi rsd575 -5.6298 1.2619 2.0063 -0.2520 2.3316 -0.2900 -0.0522 0.3527 0.4304 rsd595 -2.2393 0.9368 1.5686 -0.1953 2.5000 -0.3478 -0.0365 0.3252 0.3460 """)