Source code for openquake.hazardlib.gsim.utils

# -*- coding: utf-8 -*-
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"""
Module :mod:`openquake.hazardlib.gsim.utils` contains functions that are common
to several GMPEs.
"""
from openquake.hazardlib.imt import PGA, SA

[docs]def mblg_to_mw_johnston_96(mag): """ Convert magnitude value from Mblg to Mw using Johnston 1996 conversion equation. Implements equation as in line 1654 in hazgridXnga2.f """ return 1.14 + 0.24 * mag + 0.0933 * mag * mag
[docs]def mblg_to_mw_atkinson_boore_87(mag): """ Convert magnitude value from Mblg to Mw using Atkinson and Boore 1987 conversion equation. Implements equation as in line 1656 in hazgridXnga2.f """ return 2.715 - 0.277 * mag + 0.127 * mag * mag
[docs]def clip_mean(imt, mean): """ Clip GMPE mean value at 1.5 g for PGA and 3 g for short periods (0.02 < T < 0.55) """ if imt.period == 0: mean[mean > 0.405] = 0.405 if 0.02 < imt.period < 0.55: mean[mean > 1.099] = 1.099 return mean