Source code for openquake.hazardlib.source.non_parametric

# The Hazard Library
# Copyright (C) 2013-2018 GEM Foundation
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
"""
Module :mod:`openquake.hazardlib.source.non_parametric` defines
:class:`NonParametricSeismicSource`
"""
from openquake.hazardlib.source.base import BaseSeismicSource
from openquake.hazardlib.geo.surface.multi import MultiSurface
from openquake.hazardlib.source.rupture import \
    NonParametricProbabilisticRupture
from openquake.hazardlib.geo.utils import angular_distance, KM_TO_DEGREES
from openquake.baselib.slots import with_slots


[docs]@with_slots class NonParametricSeismicSource(BaseSeismicSource): """ Non Parametric Seismic Source explicitly defines earthquake ruptures in the constructor. That is earthquake ruptures are not generated algorithmically from a set of source parameters. Ruptures' rectonic region types are overwritten by source tectonic region type. :param data: List of tuples. Each tuple must contain two items. The first item must be an instance of :class:`openquake.hazardlib.source.rupture.Rupture`. The second item must be an instance of :class:`openquake.hazardlib.pmf.PMF` describing the probability of the rupture to occur N times (the PMF must be defined from a minimum number of occurrences equal to 0) """ _slots_ = BaseSeismicSource._slots_ + ['data'] MODIFICATIONS = set() def __init__(self, source_id, name, tectonic_region_type, data): super().__init__(source_id, name, tectonic_region_type) self.data = data
[docs] def iter_ruptures(self): """ Get a generator object that yields probabilistic ruptures the source consists of. :returns: Generator of instances of :class: `~openquake.hazardlib.source.rupture.NonParametricProbabilisticRupture`. """ for rup, pmf in self.data: yield NonParametricProbabilisticRupture( rup.mag, rup.rake, self.tectonic_region_type, rup.hypocenter, rup.surface, pmf)
def __iter__(self): if len(self.data) == 1: # there is nothing to split yield self return for i, rup_pmf in enumerate(self.data): source_id = '%s:%d' % (self.source_id, i) src = self.__class__(source_id, self.name, self.tectonic_region_type, [rup_pmf]) src.num_ruptures = 1 src.src_group_id = self.src_group_id yield src
[docs] def count_ruptures(self): """ See :meth: `openquake.hazardlib.source.base.BaseSeismicSource.count_ruptures`. """ return len(self.data)
[docs] def get_min_max_mag(self): """ Return the minimum and maximum magnitudes of the ruptures generated by the source """ min_mag = min(rup.mag for rup, pmf in self.data) max_mag = max(rup.mag for rup, pmf in self.data) return min_mag, max_mag
[docs] def get_bounding_box(self, maxdist): """ Bounding box containing all surfaces, enlarged by the maximum distance """ surfaces = [] for rup, _ in self.data: if isinstance(rup.surface, MultiSurface): for s in rup.surface.surfaces: surfaces.append(s) else: surfaces.append(rup.surface) multi_surf = MultiSurface(surfaces) west, east, north, south = multi_surf.get_bounding_box() a1 = maxdist * KM_TO_DEGREES a2 = angular_distance(maxdist, north, south) return west - a2, south - a1, east + a2, north + a1