# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright (C) 2012-2025 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/>.
""":mod:`openquake.hazardlib.calc.hazard_curve` implements
:func:`calc_hazard_curves`. Here is an example of a classical PSHA
parallel calculator computing the hazard curves per each realization in less
than 20 lines of code:
.. code-block:: python
import sys
from openquake.commonlib import logs
from openquake.calculators.base import calculators
def main(job_ini):
with logs.init(job_ini) as log:
calc = calculators(log.get_oqparam(), log.calc_id)
calc.run(individual_rlzs='true', shutdown=True)
print('The hazard curves are in %s::/hcurves-rlzs'
% calc.datastore.filename)
if __name__ == '__main__':
main(sys.argv[1]) # path to a job.ini file
NB: the implementation in the engine is smarter and more
efficient. Here we start a parallel computation per each realization,
the engine manages all the realizations at once.
"""
import operator
import numpy
from openquake.baselib.performance import Monitor
from openquake.baselib.parallel import sequential_apply
from openquake.baselib.general import DictArray, groupby
from openquake.hazardlib.map_array import MapArray
from openquake.hazardlib.contexts import ContextMaker, RmapMaker
from openquake.hazardlib.sourceconverter import SourceGroup
[docs]def classical(group, sitecol, cmaker):
"""
Compute the hazard curves for a set of sources belonging to the same
tectonic region type for all the GSIMs associated to that TRT.
The arguments are the same as in :func:`calc_hazard_curves`, except
for ``gsims``, which is a list of GSIM instances.
:returns:
a dictionary with keys pmap, source_data, rup_data, extra
"""
trts = set()
for src in group:
if not src.num_ruptures:
# not be set in hazardlib, but always in the engine
src.num_ruptures = src.count_ruptures()
trts.add(src.tectonic_region_type)
[trt] = trts # there must be a single tectonic region type
if cmaker.trt != '*':
assert trt == cmaker.trt, (trt, cmaker.trt)
dic = RmapMaker(cmaker, sitecol, group).make()
return dic
# not used in the engine, only in tests and possibly notebooks
[docs]def calc_hazard_curves(
groups, srcfilter, imtls, gsim_by_trt, truncation_level=99.,
apply=sequential_apply, reqv=None, **kwargs):
"""
Compute hazard curves on a list of sites, given a set of seismic source
groups and a dictionary of ground shaking intensity models (one per
tectonic region type).
Probability of ground motion exceedance is computed in different ways
depending if the sources are independent or mutually exclusive.
:param groups:
A sequence of groups of seismic sources objects (instances of
of :class:`~openquake.hazardlib.source.base.BaseSeismicSource`).
:param srcfilter:
A source filter over the site collection or the site collection itself
:param imtls:
Dictionary mapping intensity measure type strings
to lists of intensity measure levels.
:param gsim_by_trt:
Dictionary mapping tectonic region types (members
of :class:`openquake.hazardlib.const.TRT`) to
:class:`~openquake.hazardlib.gsim.base.GMPE` or
:class:`~openquake.hazardlib.gsim.base.IPE` objects.
:param truncation_level:
Float, number of standard deviations for truncation of the intensity
distribution.
:param apply:
apply function to use (default sequential_apply)
:param reqv:
If not None, an instance of RjbEquivalent
:returns:
An array of size N, where N is the number of sites, which elements
are records with fields given by the intensity measure types; the
size of each field is given by the number of levels in ``imtls``.
"""
# This is ensuring backward compatibility i.e. processing a list of
# sources
if not isinstance(groups[0], SourceGroup): # sent a list of sources
odic = groupby(groups, operator.attrgetter('tectonic_region_type'))
groups = [SourceGroup(trt, odic[trt], 'src_group', 'indep', 'indep')
for trt in odic]
idx = 0
span = None
for i, grp in enumerate(groups):
for src in grp:
tom = getattr(src, 'temporal_occurrence_model', None)
span = tom.time_span if tom else kwargs['investigation_time']
src.weight = src.count_ruptures()
src.grp_id = i
src.id = idx
idx += 1
imtls = DictArray(imtls)
shift_hypo = kwargs['shift_hypo'] if 'shift_hypo' in kwargs else False
param = dict(imtls=imtls, truncation_level=truncation_level, reqv=reqv,
cluster=grp.cluster, shift_hypo=shift_hypo,
investigation_time=span, af=None)
# Processing groups with homogeneous tectonic region
mon = Monitor()
sitecol = getattr(srcfilter, 'sitecol', srcfilter)
pmap = MapArray(sitecol.sids, imtls.size, 1).fill(0)
for group in groups:
trt = group.trt
if sitecol is not srcfilter:
param['maximum_distance'] = srcfilter.integration_distance(trt)
cmaker = ContextMaker(trt, [gsim_by_trt[trt]], param, mon)
if group.atomic: # do not split
it = [classical(group, sitecol, cmaker)]
else: # split the group and apply `classical` in parallel
it = apply(
classical, (group.sources, sitecol, cmaker),
weight=operator.attrgetter('weight'))
for dic in it:
rmap = dic['rmap']
pmap.array[:] = 1. - (1.-pmap.array) * numpy.exp(-rmap.array)
return pmap.convert(imtls, len(sitecol.complete))
