Source code for openquake.hazardlib.gsim.dost_2004

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"""
Module exports :class:'DostEtAl2004'
"""
from __future__ import division
import numpy as np
# standard acceleration of gravity in m/s**2
from scipy.constants import g


from openquake.hazardlib.gsim.base import GMPE, CoeffsTable
from openquake.hazardlib import const
from openquake.hazardlib.imt import PGA, PGV

[docs]class DostEtAl2004(GMPE): """ Implements the GMPE of Dost et al. (2004) for PGA and PGV from induced seismicity earthquakes in the Netherlands Dost, B., van Eck, T. and Haak, H. (2004) Scaling of peak ground acceleration and peak ground velocity recorded in the Netherlands. Bollettino di Geofisica Teorica ed Applicata. 45(3), 153 - 168 """ #: The GMPE is derived from induced earthquakes DEFINED_FOR_TECTONIC_REGION_TYPE = const.TRT.INDUCED #: Supported intensity measure types are peak ground acceleration #: and peak ground velocity DEFINED_FOR_INTENSITY_MEASURE_TYPES = set([ PGA, PGV ]) #: Supported intensity measure component is the average horizontal DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = const.IMC.GMRotD100 #: Supported standard deviation types is total. DEFINED_FOR_STANDARD_DEVIATION_TYPES = set([ const.StdDev.TOTAL ]) #: No required site parameters REQUIRES_SITES_PARAMETERS = set(()) #: Required rupture parameters are magnitude (ML is used) REQUIRES_RUPTURE_PARAMETERS = set(('mag', )) #: Required distance measure is hypocentral distance REQUIRES_DISTANCES = set(('rhypo',)) #: GMPE not tested against independent implementation so raise #: not verified warning non_verified = True
[docs] def get_mean_and_stddevs(self, sites, rup, dists, imt, stddev_types): """ See :meth:`superclass method <.base.GroundShakingIntensityModel.get_mean_and_stddevs>` for spec of input and result values. """ C = self.COEFFS[imt] imean = (self._compute_magnitude_term(C, rup.mag) + self._compute_distance_term(C, dists.rhypo)) # Convert mean from cm/s and cm/s/s if isinstance(imt, PGA): mean = np.log((10.0 ** (imean)) / g) else: mean = np.log(10.0 ** imean) stddevs = self._get_stddevs(C, len(dists.rhypo), stddev_types) return mean, stddevs
def _compute_magnitude_term(self, C, mag): """ Returns the magnitude scaling term """ return C["c0"] + (C["c1"] * mag) def _compute_distance_term(self, C, rhypo): """ Returns the distance scaling term """ return (C["c2"] * rhypo) + (C["c3"] * np.log10(rhypo)) def _get_stddevs(self, C, num_sites, stddev_types): """ Returns the total standard deviation """ stddevs = [] for stddev_type in stddev_types: assert stddev_type in self.DEFINED_FOR_STANDARD_DEVIATION_TYPES if stddev_type == const.StdDev.TOTAL: stddevs.append( np.log(10.0 ** C["sigma"]) + np.zeros(num_sites)) return stddevs COEFFS = CoeffsTable(sa_damping=5, table=""" IMT c0 c1 c2 c3 sigma pgv -1.53 0.74 -0.00139 -1.33 0.33 pga -1.41 0.57 -0.00139 -1.33 0.33 """)
[docs]class DostEtAl2004BommerAdaptation(DostEtAl2004): """ Adaptation of the GMPE for application to higher magnitudes proposed by Bommer et al. (2013) """ #: Supported standard deviation types is total. DEFINED_FOR_STANDARD_DEVIATION_TYPES = set([ const.StdDev.TOTAL, const.StdDev.INTER_EVENT, const.StdDev.INTRA_EVENT ]) def _compute_magnitude_term(self, C, mag): """ Returns the magnitude scaling term """ return C["c0"] + (C["c1"] * mag) + (C["c1e"] * ((mag - 4.5) ** 2.0)) def _get_stddevs(self, C, num_sites, stddev_types): """ Returns the the total, inter-event and intra-event standard deviation """ stddevs = [] for stddev_type in stddev_types: assert stddev_type in self.DEFINED_FOR_STANDARD_DEVIATION_TYPES if stddev_type == const.StdDev.TOTAL: stddevs.append( np.log(10.0 ** C["sigma"]) + np.zeros(num_sites)) if stddev_type == const.StdDev.INTER_EVENT: stddevs.append( np.log(10.0 ** C["tau"]) + np.zeros(num_sites)) if stddev_type == const.StdDev.INTRA_EVENT: stddevs.append( np.log(10.0 ** C["phi"]) + np.zeros(num_sites)) return stddevs COEFFS = CoeffsTable(sa_damping=5, table=""" IMT c0 c1 c1e c2 c3 tau phi sigma pgv -1.3972 0.7105 -0.0829 -0.00139 -1.33 0.1476 0.2952 0.33 pga -1.6090 0.6140 -0.1116 -0.00139 -1.33 0.1476 0.2952 0.33 """)