Source code for openquake.hazardlib.scalerel.point

# -*- coding: utf-8 -*-
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"""
Module :mod:`openquake.hazardlib.scalerel.point` implements :class:`PointMSR`.
"""
import numpy
from openquake.hazardlib.scalerel.base import BaseMSR


[docs]class PointMSR(BaseMSR):
    """
    Implements magnitude-area scaling relationship to mimic point ruptures.
    Independently of the magnitude value, this scaling relationship returns
    always a very small value (1e-4 squared km, corresponding to a 10 by 10 m
    square) for the median area.

    NOTE: This scaling-relationship is meant to be used in area and point
    sources to mimic point ruptures. Is not intended to be used in fault
    sources, as it would require a fault surface discretization step to small
    (less than 10 m, using an aspect ratio equal to 1) which is unfeasible for
    realistic applications.
    """
[docs]    def get_median_area(self, mag, rake):
        """
        Returns a value equal to 1e-4 squared km independently of ``mag`` and
        ``rake`` values.

        >>> point_msr = PointMSR()
        >>> 1e-4 == point_msr.get_median_area(4.0, 50)
        True
        >>> 1e-4 == point_msr.get_median_area(9.0, 0)
        True
        """
        return numpy.full_like(mag, 1e-4, dtype=float)