Constants

Module openquake.hazardlib.const defines various constants.

class openquake.hazardlib.const.ConstantContainer

Class that doesn’t support instantiation.

>>> ConstantContainer()
Traceback (most recent call last):
    ...
AssertionError: do not create objects ConstantContainer, use class properties instead

class openquake.hazardlib.const.IMC

The intensity measure component is the component of interest of ground shaking for an intensity measure.

AVERAGE_HORIZONTAL = 'Average horizontal'

Usually defined as the geometric average of the maximum of the two horizontal components (which may not occur at the same time).

GMRotD100 = 'Average Horizontal (GMRotD100)'

The geometric mean of the records rotated into the most adverse direction for the structure.

GMRotI50 = 'Average Horizontal (GMRotI50)'

An orientation-independent alternative to AVERAGE_HORIZONTAL. Defined at Boore et al. (2006, Bull. Seism. Soc. Am. 96, 1502-1511) and is used for all the NGA GMPEs.

GREATER_OF_TWO_HORIZONTAL = 'Greater of two horizontal'

The largest value obtained from two perpendicular horizontal components.

HORIZONTAL = 'Horizontal'

The horizontal component.

MEDIAN_HORIZONTAL = 'Median horizontal'

The median horizontal component.

PEAK_SRSS_HORIZONTAL = 'Peak square root of sum of squares of horizontals'

“the peak square root of the sum of squares of two orthogonal horizontal components in the time domain” p. 880 of Kanno et al. (2006, Bull. Seism. Soc. Am. 96, 879-897)

RANDOM_HORIZONTAL = 'Random horizontal'

A randomly chosen horizontal component.

RotD100 = 'Horizontal Maximum Direction (RotD100)'

RotD50 = 'Average Horizontal (RotD50)'

An orientation-independent alternative to AVERAGE_HORIZONTAL. Defined at Boore et al. (2006, Bull. Seism. Soc. Am. 96, 1502-1511) and is used for all the NGA GMPEs.

VECTORIAL = 'Square root of sum of squares of peak horizontals'

“Vectorial addition: a_V = sqrt(max|a_1(t)|^2 + max|a_2(t)|^2)). This means that the maximum ground amplitudes occur simultaneously on the two horizontal components; this is a conservative assumption.” p. 53 of Douglas (2003, Earth-Sci. Rev. 61, 43-104)

VERTICAL = 'Vertical'

The vertical component.

class openquake.hazardlib.const.StdDev

GSIM standard deviation represents ground shaking variability at a site.

INTER_EVENT = 'Inter event'

Standard deviation representing ground shaking variability within different events.

INTRA_EVENT = 'Intra event'

Standard deviation representing ground shaking variability within a single event.

TOTAL = 'Total'

Total standard deviation, defined as the square root of the sum of inter- and intra-event squared standard deviations, represents the total ground shaking variability, and is the only one that is used for calculating a probability of intensity exceedance (see openquake.hazardlib.gsim.base.GroundShakingIntensityModel.get_poes()).

class openquake.hazardlib.const.TRT

Container for constants that define some of the common Tectonic Region Types.