Source code for openquake.hmtk.seismicity.declusterer.distance_time_windows

# -*- coding: utf-8 -*-
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# -*- coding: utf-8 -*-

"""
"""

import abc
import numpy as np
from openquake.baselib.general import CallableDict

TIME_DISTANCE_WINDOW_FUNCTIONS = CallableDict()


[docs]class BaseDistanceTimeWindow(object): """ Defines the space and time windows, within which an event is identified as a cluster. """ __metaclass__ = abc.ABCMeta @abc.abstractmethod
[docs] def calc(self, magnitude): """ Allows to calculate distance and time windows (sw_space, sw_time) see reference: `Van Stiphout et al (2011)`. :param magnitude: magnitude :type magnitude: numpy.ndarray :returns: distance and time windows :rtype: numpy.ndarray """ return
@TIME_DISTANCE_WINDOW_FUNCTIONS.add('GardnerKnopoff')
[docs]class GardnerKnopoffWindow(BaseDistanceTimeWindow): """ Gardner Knopoff method for calculating distance and time windows """
[docs] def calc(self, magnitude): sw_space = np.power(10.0, 0.1238 * magnitude + 0.983) sw_time = np.power(10.0, 0.032 * magnitude + 2.7389) / 364.75 sw_time[magnitude < 6.5] = np.power( 10.0, 0.5409 * magnitude[magnitude < 6.5] - 0.547) / 364.75 return sw_space, sw_time
@TIME_DISTANCE_WINDOW_FUNCTIONS.add('Gruenthal')
[docs]class GruenthalWindow(BaseDistanceTimeWindow): """ Gruenthal method for calculating distance and time windows """
[docs] def calc(self, magnitude): sw_space = np.exp(1.77 + np.sqrt(0.037 + 1.02 * magnitude)) sw_time = np.abs( (np.exp(-3.95 + np.sqrt(0.62 + 17.32 * magnitude))) / 364.75) sw_time[magnitude >= 6.5] = np.power( 10, 2.8 + 0.024 * magnitude[magnitude >= 6.5]) / 364.75 return sw_space, sw_time
@TIME_DISTANCE_WINDOW_FUNCTIONS.add('UrhammerWindow')
[docs]class UhrhammerWindow(BaseDistanceTimeWindow): """ Uhrhammer method for calculating distance and time windows """
[docs] def calc(self, magnitude): sw_space = np.exp(-1.024 + 0.804 * magnitude) sw_time = np.exp(-2.87 + 1.235 * magnitude) / 364.75 return sw_space, sw_time