Source code for openquake.hmtk.faults.mfd.base

# -*- coding: utf-8 -*-
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Module :mod:`mfd.base` defines an abstract base classes
for :class:`BaseMFDfromSlip>`
import abc
from openquake.hazardlib.mfd.evenly_discretized import EvenlyDiscretizedMFD

def _scale_moment(magnitude, in_nm=False):
    '''Returns the moment for a given magnitude.
    :param float magnitude:
        Earthquake magnitude
    :param bool in_nm:
        To return the value in newton metres set to true - otherwise in
    if in_nm:
        return 10.0 ** ((1.5 * magnitude) + 9.05)
        return 10.0 ** ((1.5 * magnitude) + 16.05)

[docs]class BaseMFDfromSlip(object): '''Base class for calculating magnitude frequency distribution from a given slip value'''
[docs] @abc.abstractmethod def setUp(self, mfd_conf): '''Initialises the parameters from the mfd type'''
[docs] @abc.abstractmethod def get_mmax(self, mfd_conf, msr, rake, area): '''Gets the mmax for the fault - reading directly from the config file or using the msr otherwise'''
[docs] @abc.abstractmethod def get_mfd(self): '''Calculates the magnitude frequency distribution'''
[docs] def to_evenly_discretized_mfd(self): """ Returns the activity rate as an instance of the :class: openquake.hazardlib.mfd.evenly_discretized.EvenlyDiscretizedMFD """ return EvenlyDiscretizedMFD(self.mmin + self.bin_width / 2., self.bin_width, self.occurrence_rate.tolist())