Source code for openquake.hmtk.sources.area_source

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Defines the :class:`openquake.hmtk.sources.mtk_area_source.mtkAreaSource`
which represents the openquake.hmtk defition of an area source.
import warnings
import numpy as np
from openquake.hazardlib.geo.point import Point
from openquake.hazardlib.geo.polygon import Polygon
from openquake.hazardlib.source.area import AreaSource
import openquake.hmtk.sources.source_conversion_utils as conv

[docs]class mtkAreaSource(object): ''' Describes the Area Source :param str identifier: ID code for the source :param str name: Source name :param str trt: Tectonic region type :param geometry: Instance of :class: nhlib.geo.polygon.Polygon class :param float upper_depth: Upper seismogenic depth (km) :param float lower_depth: Lower seismogenic depth (km) :param str mag_scale_rel: Magnitude scaling relationsip :param float rupt_aspect_ratio: Rupture aspect ratio :param mfd: Magnitude frequency distribution as instance of :class: nrml.models.IncrementalMFD or :class: nrml.models.TGRMFD :param list nodal_plane_dist: List of :class: nrml.models.NodalPlane objects representing nodal plane distribution :param list hypo_depth_dist: List of :class: nrml.models.HypocentralDepth instances describing the hypocentral depth distribution :param catalogue: Earthquake catalogue associated to source as instance of openquake.hmtk.seismicity.catalogue.Catalogue object ''' def __init__(self, identifier, name, trt=None, geometry=None, upper_depth=None, lower_depth=None, mag_scale_rel=None, rupt_aspect_ratio=None, mfd=None, nodal_plane_dist=None, hypo_depth_dist=None): ''' Instantiates class with two essential attributes: identifier and name ''' self.typology = 'Area' = identifier = name self.trt = trt self.geometry = geometry self.upper_depth = upper_depth self.lower_depth = lower_depth self.mag_scale_rel = mag_scale_rel self.rupt_aspect_ratio = rupt_aspect_ratio self.mfd = mfd self.nodal_plane_dist = nodal_plane_dist self.hypo_depth_dist = hypo_depth_dist # Check consistency of hypocentral depth inputs self._check_seismogenic_depths(upper_depth, lower_depth) self.catalogue = None
[docs] def create_geometry(self, input_geometry, upper_depth, lower_depth): ''' If geometry is defined as a numpy array then create instance of nhlib.geo.polygon.Polygon class, otherwise if already instance of class accept class :param input_geometry: Input geometry (polygon) as either i) instance of nhlib.geo.polygon.Polygon class ii) numpy.ndarray [Longitude, Latitude] :param float upper_depth: Upper seismogenic depth (km) :param float lower_depth: Lower seismogenic depth (km) ''' self._check_seismogenic_depths(upper_depth, lower_depth) # Check/create the geometry class if not isinstance(input_geometry, Polygon): if not isinstance(input_geometry, np.ndarray): raise ValueError('Unrecognised or unsupported geometry ' 'definition') if np.shape(input_geometry)[0] < 3: raise ValueError('Incorrectly formatted polygon geometry -' ' needs three or more vertices') geometry = [] for row in input_geometry: geometry.append(Point(row[0], row[1], self.upper_depth)) self.geometry = Polygon(geometry) else: self.geometry = input_geometry
def _check_seismogenic_depths(self, upper_depth, lower_depth): ''' Checks the seismic depths for physical consistency :param float upper_depth: Upper seismogenic depth (km) :param float lower_depth: Lower seismogenis depth (km) ''' # Simple check on depths if upper_depth: if upper_depth < 0.: raise ValueError('Upper seismogenic depth must be greater than' ' or equal to 0.0!') else: self.upper_depth = upper_depth else: self.upper_depth = 0.0 if lower_depth: if lower_depth < self.upper_depth: raise ValueError('Lower seismogenic depth must take a greater' ' value than upper seismogenic depth') else: self.lower_depth = lower_depth else: self.lower_depth = np.inf
[docs] def select_catalogue(self, selector, distance=None): ''' Selects the catalogue of earthquakes attributable to the source :param selector: Populated instance of :class:`openquake.hmtk.seismicity.selector.CatalogueSelector` :param float distance: Distance (in km) to extend or contract (if negative) the zone for selecting events ''' if selector.catalogue.get_number_events() < 1: raise ValueError('No events found in catalogue!') self.catalogue = selector.within_polygon(self.geometry, distance, upper_depth=self.upper_depth, lower_depth=self.lower_depth) if self.catalogue.get_number_events() < 5: # Throw a warning regarding the small number of earthquakes in # the source! warnings.warn('Source %s (%s) has fewer than 5 events' % (,
[docs] def create_oqhazardlib_source(self, tom, mesh_spacing, area_discretisation, use_defaults=False): """ Converts the source model into an instance of the :class: openquake.hazardlib.source.area.AreaSource :param tom: Temporal Occurrence model as instance of :class: openquake.hazardlib.tom.TOM :param float mesh_spacing: Mesh spacing """ if not self.mfd: raise ValueError("Cannot write to hazardlib without MFD") return AreaSource(,, self.trt, self.mfd, mesh_spacing, conv.mag_scale_rel_to_hazardlib(self.mag_scale_rel, use_defaults), conv.render_aspect_ratio(self.rupt_aspect_ratio, use_defaults), tom, self.upper_depth, self.lower_depth, conv.npd_to_pmf(self.nodal_plane_dist, use_defaults), conv.hdd_to_pmf(self.hypo_depth_dist, use_defaults), self.geometry, area_discretisation)