Source code for openquake.hazardlib.gsim.boore_1993
# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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"""
Module exports :class:`BooreEtAl1993GSCBest`,
:class:`BooreEtAl1993GSCUpperLimit`, :class:`BooreEtAl1993GSCLowerLimit`.
"""
from __future__ import division
import numpy as np
from scipy.constants import g
from openquake.hazardlib.gsim.base import GMPE, CoeffsTable
from openquake.hazardlib import const
from openquake.hazardlib.imt import PGA, SA
[docs]class BooreEtAl1993GSCBest(GMPE):
"""
Implement equation used by the Geological Survey of Canada (GSC) for
the 2010 Western Canada National Seismic Hazard Model. The class implements
the model of David M. Boore, William B. Joyner, and Thomas E. Fumal
("Estimation of Response Spectra and Peak Accelerations from Western North
American Earthquakes: An Interim Report", 1993, U.S. Geological Survey,
Open File Report 93-509).
Equation coefficients provided by GSC for the random horizontal component
and corresponding to the 'Best' case (that is mean unaffected)
"""
#: Supported tectonic region type is active shallow crust, given
#: that the equations have been derived for Western North America
DEFINED_FOR_TECTONIC_REGION_TYPE = const.TRT.ACTIVE_SHALLOW_CRUST
#: Supported intensity measure types are spectral acceleration,
#: and peak ground acceleration
DEFINED_FOR_INTENSITY_MEASURE_TYPES = set([
PGA,
SA
])
#: Supported intensity measure component is random horizontal
#: :attr:`~openquake.hazardlib.const.IMC.RANDOM_HORIZONTAL`,
DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = const.IMC.RANDOM_HORIZONTAL
#: Supported standard deviation type is total
DEFINED_FOR_STANDARD_DEVIATION_TYPES = set([
const.StdDev.TOTAL
])
#: site params are not required
REQUIRES_SITES_PARAMETERS = set()
#: Required rupture parameter is magnitude
REQUIRES_RUPTURE_PARAMETERS = set(('mag', ))
#: Required distance measure is Rjb distance
#: see paragraph 'Predictor Variables', page 6.
REQUIRES_DISTANCES = set(('rjb', ))
[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]
mag = rup.mag - 6
d = np.sqrt(dists.rjb ** 2 + C['c7'] ** 2)
mean = np.zeros_like(d)
mean += C['c1'] + C['c2'] * mag + C['c3'] * mag ** 2 + C['c6']
idx = d <= 100.
mean[idx] = mean[idx] + C['c5'] * np.log10(d[idx])
idx = d > 100.
mean[idx] = (mean[idx] + C['c5'] * np.log10(100.) -
np.log10(d[idx] / 100.) + C['c4'] * (d[idx] - 100.))
# convert from log10 to ln and from cm/s**2 to g
mean = np.log((10.0 ** (mean - 2.0)) / g)
stddevs = self._get_stddevs(C, stddev_types, dists.rjb.shape[0])
return mean, stddevs
def _get_stddevs(self, C, stddev_types, num_sites):
"""
Return total standard deviation.
"""
assert all(stddev_type in self.DEFINED_FOR_STANDARD_DEVIATION_TYPES
for stddev_type in stddev_types)
stddevs = [np.zeros(num_sites) + C['sigma'] for _ in stddev_types]
return stddevs
#: coefficient table provided by GSC
COEFFS = CoeffsTable(sa_damping=5, table="""\
IMT c1 c2 c3 c4 c5 c6 c7 sigma
pga 2.887 0.229 0.0 -0.00326 -0.778 0.162 5.57 0.529
0.1 3.451 0.327 -0.098 -0.00395 -0.934 0.046 6.27 0.479
0.2 3.464 0.309 -0.090 -0.00259 -0.924 0.190 7.02 0.495
0.3 3.295 0.334 -0.070 -0.00202 -0.893 0.239 5.94 0.520
0.5 2.980 0.384 -0.039 -0.00148 -0.846 0.279 4.13 0.562
1.0 2.522 0.450 -0.014 -0.00097 -0.798 0.314 2.90 0.622
2.0 2.234 0.471 -0.037 -0.00064 -0.812 0.360 5.85 0.675
""")
[docs]class BooreEtAl1993GSCUpperLimit(BooreEtAl1993GSCBest):
"""
Implement equation used by the Geological Survey of Canada (GSC) for
the 2010 Western Canada National Seismic Hazard Model. The class implements
the model of David M. Boore, William B. Joyner, and Thomas E. Fumal
("Estimation of Response Spectra and Peak Accelerations from Western North
American Earthquakes: An Interim Report", 1993, U.S. Geological Survey,
Open File Report 93-509).
Equation coefficients provided by GSC for the random horizontal component
and corresponding to the 'Upper Limit' case (that is mean value + 0.7 nat
log)
"""
#: coefficient table provided by GSC
COEFFS = CoeffsTable(sa_damping=5, table="""\
IMT c1 c2 c3 c4 c5 c6 c7 sigma
pga 3.187 0.229 0.0 -0.00326 -0.778 0.162 5.57 0.529
0.1 3.751 0.327 -0.098 -0.00395 -0.934 0.046 6.27 0.479
0.2 3.764 0.309 -0.090 -0.00259 -0.924 0.190 7.02 0.495
0.3 3.595 0.334 -0.070 -0.00202 -0.893 0.239 5.94 0.520
0.5 3.280 0.384 -0.039 -0.00148 -0.846 0.279 4.13 0.562
1.0 2.822 0.450 -0.014 -0.00097 -0.798 0.314 2.90 0.622
2.0 2.534 0.471 -0.037 -0.00064 -0.812 0.360 5.85 0.675
""")
[docs]class BooreEtAl1993GSCLowerLimit(BooreEtAl1993GSCBest):
"""
Implement equation used by the Geological Survey of Canada (GSC) for
the 2010 Western Canada National Seismic Hazard Model. The class implements
the model of David M. Boore, William B. Joyner, and Thomas E. Fumal
("Estimation of Response Spectra and Peak Accelerations from Western North
American Earthquakes: An Interim Report", 1993, U.S. Geological Survey,
Open File Report 93-509).
Equation coefficients provided by GSC for the random horizontal component
and corresponding to the 'Lower Limit' case (that is mean value - 0.7 nat
log)
"""
#: coefficient table provided by GSC
COEFFS = CoeffsTable(sa_damping=5, table="""\
IMT c1 c2 c3 c4 c5 c6 c7 sigma
pga 2.587 0.229 0.0 -0.00326 -0.778 0.162 5.57 0.529
0.1 3.151 0.327 -0.098 -0.00395 -0.934 0.046 6.27 0.479
0.2 3.164 0.309 -0.090 -0.00259 -0.924 0.190 7.02 0.495
0.3 2.995 0.334 -0.070 -0.00202 -0.893 0.239 5.94 0.520
0.5 2.680 0.384 -0.039 -0.00148 -0.846 0.279 4.13 0.562
1.0 2.222 0.450 -0.014 -0.00097 -0.798 0.314 2.90 0.622
2.0 1.934 0.471 -0.037 -0.00064 -0.812 0.360 5.85 0.675
""")