Source code for openquake.hmtk.faults.fault_geometries

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import abc
import numpy as np
from openquake.hazardlib.geo.surface.simple_fault import SimpleFaultSurface
from openquake.hazardlib.geo.surface.complex_fault import ComplexFaultSurface


[docs]class BaseFaultGeometry(object): ''' Abstract base class to support geometry parameters and methods '''
[docs] @abc.abstractmethod def get_area(self): ''' Returns the area of the fault surface '''
[docs]class SimpleFaultGeometry(BaseFaultGeometry): ''' Describes the geometrical propeties of a simple fault surface :param str typology: Source typology :param trace: Fault trace as instance of :class: openquake.hazardlib.geo.line.Line :param float dip: Fault dip (degrees) :param float upper_depth: Upper seismogenic depth (km) :param float lower_depth: Lower seismogenic depth (km) :param surface: Instance of :class: openquake.hazardlib.geo.surface.simple_fault.SimpleFaultSurface :param float length: Along-strike length of fault (km) :param float width: Down-dip width of fault (km) :param float area: Length of fault (km) ''' def __init__(self, trace, dip, upper_depth, lower_depth, mesh_spacing=1.0): ''' Sets up the fault geometry parameters from the input fault definitions :param float mesh_spacing: Spacing (km) of the fault surface mesh ''' self.typology = 'Simple' self.trace = trace self.dip = dip self.upper_depth = upper_depth self.lower_depth = lower_depth self.surface = SimpleFaultSurface.from_fault_data(self.trace, self.upper_depth, self.lower_depth, self.dip, mesh_spacing) self.length = trace.get_length() self.downdip_width = None self.surface_width = None self.area = None
[docs] def get_area(self): ''' Calculates the area of the fault (km ** 2.) as the product of length (km) and downdip width (km) ''' d_z = self.lower_depth - self.upper_depth self.downdip_width = d_z / np.sin(self.dip * np.pi / 180.) self.surface_width = self.downdip_width * np.cos(self.dip * np.pi / 180.) self.area = self.length * self.downdip_width return self.area
[docs]class ComplexFaultGeometry(BaseFaultGeometry): ''' Module openquake.hmtk.faults.fault_model.ComplexFaultGeometry describes the geometrical properties of a complex fault surface :param str typology: Source typology :param trace: Fault edges as list of instances of :class: openquake.hazardlib.geo.line.Line :param float dip: Fault dip (degrees) :param float upper_depth: Upper seismogenic depth (km) :param float lower_depth: Lower seismogenic depth (km) :param surface: Instance of :class: openquake.hazardlib.geo.surface.complex_fault.ComplexFaultSurface :param float length: Along-strike length of fault (km) :param float width: Down-dip width of fault (km) :param float area: Length of fault (km) ''' def __init__(self, traces, mesh_spacing=1.0): ''' Set up function an creates complex fault surface :param list traces: Edges of the complex fault as a list of :class: openquake.hazardlib.geo.line.Line. Please refer to documentation of openquake.hazardlib.geo.surface.complex_fault.ComplexFaultSurface for details. :param float mesh_spacing: Spacing (km) of the fault surface mesh ''' self.typology = 'Complex' self.trace = traces self.upper_depth = None self.lower_depth = None self.surface = ComplexFaultSurface.from_fault_data(self.trace, mesh_spacing) self.dip = self.surface.get_dip()
[docs] def get_area(self): ''' Calculates the area of the complex fault from the surface mesh uses :class: openquake.hazardlib.surface.complex_fault.ComplexFaultSurface ''' return self.surface.get_area()