Source code for openquake.hazardlib.gsim.arroyo_2010
# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright (C) 2014-2025 GEM Foundation
#
# OpenQuake is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# OpenQuake is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with OpenQuake. If not, see <http://www.gnu.org/licenses/>.
"""
Module exports :class:'ArroyoEtAl2010SInter'
"""
import numpy as np
from scipy.constants import g
from scipy.special import exp1
from openquake.hazardlib.gsim.base import GMPE, CoeffsTable
from openquake.hazardlib import const
from openquake.hazardlib.imt import PGA, SA
def _compute_mean(C, g, ctx):
"""
Compute mean according to equation 8a, page 773.
"""
mag = ctx.mag
dis = ctx.rrup
# computing r02 parameter and the average distance to the fault surface
ro2 = 1.4447e-5 * np.exp(2.3026 * mag)
avg = np.sqrt(dis ** 2 + ro2)
# computing fourth term of Eq. 8a, page 773.
trm4 = (exp1(C['c4'] * dis) - exp1(C['c4'] * avg)) / ro2
# computing the mean
mean = C['c1'] + C['c2'] * mag + C['c3'] * np.log(trm4)
# convert from cm/s**2 to 'g'
mean = np.log(np.exp(mean) * 1e-2 / g)
return mean
def _get_stddevs(C):
"""
Return standard deviations as defined in table 2, page 776.
"""
stds = np.array([C['s_t'], C['s_e'], C['s_r']])
return stds
[docs]class ArroyoEtAl2010SInter(GMPE):
"""
Implements GMPE developed by Arroyo et al. (2010) for Mexican
subduction interface events and published as:
Arroyo D., García D., Ordaz M., Mora M. A., and Singh S. K. (2010)
"Strong ground-motion relations for Mexican interplate earhquakes",
J. Seismol., 14:769-785.
The original formulation predict peak ground acceleration (PGA), in
cm/s**2, and 5% damped pseudo-acceleration response spectra (PSA) in
cm/s**2 for the geometric average of the maximum component of the two
horizontal component of ground motion.
The GMPE predicted values for Mexican interplate events at rock sites
(NEHRP B site condition) in the forearc region.
"""
#: Supported tectonic region type is subduction interface,
#: given that the equations have been derived using Mexican interface
#: events.
DEFINED_FOR_TECTONIC_REGION_TYPE = const.TRT.SUBDUCTION_INTERFACE
#: Supported intensity measure types are spectral acceleration,
#: and peak ground acceleration. See Table 2 in page 776.
DEFINED_FOR_INTENSITY_MEASURE_TYPES = {PGA, SA}
#: Supported intensity measure component is the geometric average of
# the maximum of the two horizontal components.
DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = const.IMC.GEOMETRIC_MEAN
#: Supported standard deviation types are inter-event, intra-event
#: and total. See Table 2, page 776.
DEFINED_FOR_STANDARD_DEVIATION_TYPES = {
const.StdDev.TOTAL,
const.StdDev.INTER_EVENT,
const.StdDev.INTRA_EVENT}
#: No site parameters required
REQUIRES_SITES_PARAMETERS = {'vs30'}
#: Required rupture parameter is the magnitude
REQUIRES_RUPTURE_PARAMETERS = {'mag'}
#: Required distance measure is Rrup (closest distance to fault surface)
REQUIRES_DISTANCES = {'rrup'}
[docs] def compute(self, ctx: np.recarray, 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] = _compute_mean(C, g, ctx)
sig[m], tau[m], phi[m] = _get_stddevs(C)
#: Equation coefficients for geometric average of the maximum of the two
#: horizontal components, as described in Table 2 on page 776.
COEFFS = CoeffsTable(sa_damping=5, table="""\
IMT c1 c2 c3 c4 g_e bias s_t s_e s_r
0.040 3.8123 0.8636 0.5578 0.0150 0.3962 -0.0254 0.8228 0.5179 0.6394
0.045 4.0440 0.8489 0.5645 0.0150 0.3874 -0.0285 0.8429 0.5246 0.6597
0.050 4.1429 0.8580 0.5725 0.0150 0.3731 -0.0181 0.8512 0.5199 0.6740
0.055 4.3092 0.8424 0.5765 0.0150 0.3746 0.0004 0.8583 0.5253 0.6788
0.060 4.3770 0.8458 0.5798 0.0150 0.4192 -0.0120 0.8591 0.5563 0.6547
0.065 4.5185 0.8273 0.5796 0.0150 0.3888 -0.0226 0.8452 0.5270 0.6607
0.070 4.4591 0.8394 0.5762 0.0150 0.3872 -0.0346 0.8423 0.5241 0.6594
0.075 4.5939 0.8313 0.5804 0.0150 0.3775 -0.0241 0.8473 0.5205 0.6685
0.080 4.4832 0.8541 0.5792 0.0150 0.3737 -0.0241 0.8421 0.5148 0.6664
0.085 4.5062 0.8481 0.5771 0.0150 0.3757 -0.0138 0.8344 0.5115 0.6593
0.090 4.4648 0.8536 0.5742 0.0150 0.4031 -0.0248 0.8304 0.5273 0.6415
0.095 4.3940 0.8580 0.5712 0.0150 0.4097 0.0040 0.8294 0.5309 0.6373
0.100 4.3391 0.8620 0.5666 0.0150 0.3841 -0.0045 0.8254 0.5116 0.6477
0.120 4.0505 0.8933 0.5546 0.0150 0.3589 -0.0202 0.7960 0.4768 0.6374
0.140 3.5599 0.9379 0.5350 0.0150 0.3528 -0.0293 0.7828 0.4650 0.6298
0.160 3.1311 0.9736 0.5175 0.0150 0.3324 -0.0246 0.7845 0.4523 0.6409
0.180 2.7012 1.0030 0.4985 0.0150 0.3291 -0.0196 0.7717 0.4427 0.6321
0.200 2.5485 0.9988 0.4850 0.0150 0.3439 -0.0250 0.7551 0.4428 0.6116
0.220 2.2699 1.0125 0.4710 0.0150 0.3240 -0.0205 0.7431 0.4229 0.6109
0.240 1.9130 1.0450 0.4591 0.0150 0.3285 -0.0246 0.7369 0.4223 0.6039
0.260 1.7181 1.0418 0.4450 0.0150 0.3595 -0.0220 0.7264 0.4356 0.5814
0.280 1.4039 1.0782 0.4391 0.0150 0.3381 -0.0260 0.7209 0.4191 0.5865
0.300 1.1080 1.1038 0.4287 0.0150 0.3537 -0.0368 0.7198 0.4281 0.5787
0.320 1.0652 1.0868 0.4208 0.0150 0.3702 -0.0345 0.7206 0.4384 0.5719
0.340 0.8319 1.1088 0.4142 0.0150 0.3423 -0.0381 0.7264 0.4250 0.5891
0.360 0.4965 1.1408 0.4044 0.0150 0.3591 -0.0383 0.7255 0.4348 0.5808
0.380 0.3173 1.1388 0.3930 0.0150 0.3673 -0.0264 0.7292 0.4419 0.5800
0.400 0.2735 1.1533 0.4067 0.0134 0.3956 -0.0317 0.7272 0.4574 0.5653
0.450 0.0990 1.1662 0.4127 0.0117 0.3466 -0.0267 0.7216 0.4249 0.5833
0.500 -0.0379 1.2206 0.4523 0.0084 0.3519 -0.0338 0.7189 0.4265 0.5788
0.550 -0.3512 1.2445 0.4493 0.0076 0.3529 -0.0298 0.7095 0.4215 0.5707
0.600 -0.6897 1.2522 0.4421 0.0067 0.3691 -0.0127 0.7084 0.4304 0.5627
0.650 -0.6673 1.2995 0.4785 0.0051 0.3361 -0.0192 0.7065 0.4096 0.5756
0.700 -0.7154 1.3263 0.5068 0.0034 0.3200 -0.0243 0.7070 0.3999 0.5830
0.750 -0.7015 1.2994 0.5056 0.0029 0.3364 -0.0122 0.7092 0.4113 0.5778
0.800 -0.8581 1.3205 0.5103 0.0023 0.3164 -0.0337 0.6974 0.3923 0.5766
0.850 -0.9712 1.3375 0.5201 0.0018 0.3435 -0.0244 0.6906 0.4047 0.5596
0.900 -1.0970 1.3532 0.5278 0.0012 0.3306 -0.0275 0.6923 0.3980 0.5665
0.950 -1.2346 1.3687 0.5345 0.0007 0.3264 -0.0306 0.6863 0.3921 0.5632
1.000 -1.2600 1.3652 0.5426 0.0001 0.3194 -0.0183 0.6798 0.3842 0.5608
1.100 -1.7687 1.4146 0.5342 0.0001 0.3336 -0.0229 0.6701 0.3871 0.5471
1.200 -2.1339 1.4417 0.5263 0.0001 0.3445 -0.0232 0.6697 0.3931 0.5422
1.300 -2.4122 1.4577 0.5201 0.0001 0.3355 -0.0231 0.6801 0.3939 0.5544
1.400 -2.5442 1.4618 0.5242 0.0001 0.3759 -0.0039 0.6763 0.4146 0.5343
1.500 -2.8509 1.4920 0.5220 0.0001 0.3780 -0.0122 0.6765 0.4159 0.5335
1.600 -3.0887 1.5157 0.5215 0.0001 0.3937 -0.0204 0.6674 0.4187 0.5197
1.700 -3.4884 1.5750 0.5261 0.0001 0.4130 -0.0208 0.6480 0.4164 0.4965
1.800 -3.7195 1.5966 0.5255 0.0001 0.3967 -0.0196 0.6327 0.3985 0.4914
1.900 -4.0141 1.6162 0.5187 0.0001 0.4248 -0.0107 0.6231 0.4062 0.4726
2.000 -4.1908 1.6314 0.5199 0.0001 0.3967 -0.0133 0.6078 0.3828 0.4721
2.500 -5.1104 1.7269 0.5277 0.0001 0.4302 -0.0192 0.6001 0.3936 0.4530
3.000 -5.5926 1.7515 0.5298 0.0001 0.4735 -0.0319 0.6029 0.4148 0.4375
3.500 -6.1202 1.8077 0.5402 0.0001 0.4848 -0.0277 0.6137 0.4273 0.4405
4.000 -6.5318 1.8353 0.5394 0.0001 0.5020 -0.0368 0.6201 0.4393 0.4376
4.500 -6.9744 1.8685 0.5328 0.0001 0.5085 -0.0539 0.6419 0.4577 0.4500
5.000 -7.1389 1.8721 0.5376 0.0001 0.5592 -0.0534 0.6701 0.5011 0.4449
pga 2.4862 0.9392 0.5061 0.0150 0.3850 -0.0181 0.7500 0.4654 0.5882
""")
