Abrahamson et al. 2015

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SInter

Implements the Subduction GMPE developed by Norman Abrahamson, Nicholas Gregor and Kofi Addo, otherwise known as the “BC Hydro” Model, published as “BC Hydro Ground Motion Prediction Equations For Subduction Earthquakes (2015, Earthquake Spectra, in press), for subduction interface events.

From observations of very large events it was found that the magnitude scaling term can be adjusted as part of the epistemic uncertainty model. The adjustment comes in the form of the parameter DeltaC1, which is period dependent for interface events. To capture the epistemic uncertainty in DeltaC1, three models are proposed: a ‘central’, ‘upper’ and ‘lower’ model. The current class implements the ‘central’ model, whilst additional classes will implement the ‘upper’ and ‘lower’ alternatives.

DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = 'Average horizontal'

Supported intensity measure component is the geometric mean component

DEFINED_FOR_INTENSITY_MEASURE_TYPES = set([<class 'openquake.hazardlib.imt.SA'>, <class 'openquake.hazardlib.imt.PGA'>])

Supported intensity measure types are spectral acceleration, and peak ground acceleration

DEFINED_FOR_STANDARD_DEVIATION_TYPES = set(['Total', 'Inter event', 'Intra event'])

Supported standard deviation types are inter-event, intra-event and total, see table 3, pages 12 - 13

DEFINED_FOR_TECTONIC_REGION_TYPE = 'Subduction Interface'

Supported tectonic region type is subduction interface

REQUIRES_DISTANCES = set(['rrup'])

Required distance measure is closest distance to rupture, for interface events

REQUIRES_RUPTURE_PARAMETERS = set(['mag'])

Required rupture parameters are magnitude for the interface model

REQUIRES_SITES_PARAMETERS = set(['backarc', 'vs30'])

Site amplification is dependent upon Vs30 For the Abrahamson et al (2013) GMPE a new term is introduced to determine whether a site is on the forearc with respect to the subduction interface, or on the backarc. This boolean is a vector containing True for a backarc site or False for a forearc or unknown site.

get_mean_and_stddevs(sites, rup, dists, imt, stddev_types)

See superclass method for spec of input and result values.

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SInterHigh

Defines the Abrahamson et al. (2013) scaling relation assuming the upper values of the magnitude scaling for large slab earthquakes, as defined in table 4

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SInterLow

Defines the Abrahamson et al. (2013) scaling relation assuming the lower values of the magnitude scaling for large slab earthquakes, as defined in table 4

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SSlab

Implements the Subduction GMPE developed by Norman Abrahamson, Nicholas Gregor and Kofi Addo, otherwise known as the “BC Hydro” Model, published as “BC Hydro Ground Motion Prediction Equations For Subduction Earthquakes (2013, Earthquake Spectra, in press). This implements only the inslab GMPE. For inslab events the source is considered to be a point source located at the hypocentre. Therefore the hypocentral distance metric is used in place of the rupture distance, and the hypocentral depth is used to scale the ground motion by depth

DEFINED_FOR_TECTONIC_REGION_TYPE = 'Subduction IntraSlab'

Supported tectonic region type is subduction in-slab

REQUIRES_DISTANCES = set(['rhypo'])

Required distance measure is hypocentral for in-slab events

REQUIRES_RUPTURE_PARAMETERS = set(['hypo_depth', 'mag'])

In-slab events require constraint of hypocentral depth and magnitude

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SSlabHigh

Defines the Abrahamson et al. (2013) scaling relation assuming the upper values of the magnitude scaling for large slab earthquakes, as defined in table 8

class openquake.hazardlib.gsim.abrahamson_2015.AbrahamsonEtAl2015SSlabLow

Defines the Abrahamson et al. (2013) scaling relation assuming the lower values of the magnitude scaling for large slab earthquakes, as defined in table 8