Source code for openquake.hazardlib.scalerel.germany2018

# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012-2020 GEM Foundation
#
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# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
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# along with OpenQuake. If not, see <http://www.gnu.org/licenses/>.

"""
Module :mod:`openquake.hazardlib.scalerel.germany2018` implements
:class:`GermanyMSR`.
"""
from openquake.hazardlib.scalerel.base import BaseMSRSigma


class GermanyMSR(BaseMSRSigma):
    """
    Implements a magnitude-area scaling relationship used within the 2018
    national seismic hazard model of Germany.

    Log10 A = -2.44 + 0.59 * mag (sigma = 0.16)
    """
    def get_median_area(self, mag, rake):
        """
        The values are a function of magnitude only
        """
        return 10.0 ** (-2.44 + 0.59 * mag)

    def get_std_dev_area(self, mag, rake):
        """
        Standard deviation fixed at 0.16
        """
        return 0.16