shakelib.multigmpe

shakelib.multigmpe.set_sites_depth_parameters(sites, gmpe)

Need to select the appropriate z1pt0 value for different GMPEs. Note that these are required site parameters, so even though OQ has these equations built into the class in most cases. I have submitted an issue to OQ requesting subclasses of these methods that do not require the depth parameters in the SitesContext to make this easier.

Parameters:

• sites – 1 An OQ sites context.

• gmpe – An OQ GMPE instance.

Returns:

An OQ sites context with the depth parameters set for the requested GMPE.

shakelib.multigmpe.stuff_context(sites, rup, dists)

Function to fill a rupture context with the contents of all of the other contexts.

Parameters:

• sites (SiteCollection) – A SiteCollection object.

• rup (RuptureContext) – A RuptureContext object.

• dists (DistanceContext) – A DistanceContext object.

Returns:

A new RuptureContext whose attributes are all of the elements of the three inputs.

Return type:

RuptureContext

shakelib.multigmpe.get_gmpe_from_name(name, conf)

class shakelib.multigmpe.MultiGMPE(**kwargs)

Bases: openquake.hazardlib.gsim.base.GMPE

Implements a GMPE that is the combination of multiple GMPEs.

DEFINED_FOR_TECTONIC_REGION_TYPE = None

Reference to a tectonic region type this GSIM is defined for. One GSIM can implement only one tectonic region type.

DEFINED_FOR_INTENSITY_MEASURE_TYPES = None

Set of intensity measure types this GSIM can calculate. A set should contain classes from module openquake.hazardlib.imt.

DEFINED_FOR_INTENSITY_MEASURE_COMPONENT = None

intensity measure component type <openquake.hazardlib.const.IMC> this GSIM can calculate mean and standard deviation for.

Type:

Reference to a

Type:

class

DEFINED_FOR_STANDARD_DEVIATION_TYPES = frozenset({'Total'})

Set of standard deviation types this GSIM can calculate.

REQUIRES_SITES_PARAMETERS = None

Set of site parameters names this GSIM needs. The set should include strings that match names of the attributes of a site object. Those attributes are then available in the SitesContext object with the same names.

REQUIRES_RUPTURE_PARAMETERS = None

Set of rupture parameters (excluding distance information) required by GSIM. Supported parameters are:

mag

Magnitude of the rupture.

dip

Rupture’s surface dip angle in decimal degrees.

rake

Angle describing the slip propagation on the rupture surface, in decimal degrees. See nodalplane for more detailed description of dip and rake.

ztor

Depth of rupture’s top edge in km. See get_top_edge_depth().

These parameters are available from the RuptureContext object attributes with same names.

REQUIRES_DISTANCES = None

Set of types of distance measures between rupture and sites. Possible values are:

rrup

Closest distance to rupture surface. See get_min_distance().

rjb

Distance to rupture’s surface projection. See get_joyner_boore_distance().

rx

Perpendicular distance to rupture top edge projection. See get_rx_distance().

ry0

Horizontal distance off the end of the rupture measured parallel to strike. See get_ry0_distance().

rcdpp

Direct point parameter for directivity effect centered on the site- and earthquake-specific average DPP used. See get_dppvalue().

rvolc

Source to site distance passing through surface projection of volcanic zone.

All the distances are available from the DistancesContext object attributes with same names. Values are in kilometers.

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

See superclass method.

Unlike the superclass method, the stddev list returned by this function will have twice as many arrays as are requested in stddev_types: The first set will include the standard deviation inflation due to the point-source to finite fault conversion (if any), and the second set will not include this inflation. In the case where a finite rupture is provided (and, thus, no point-source to finite rupture adjustments are made) the two sets of stddev arrays will be identical. Thus, if:

stddev_types = [const.StdDev.TOTAL, const.StdDev.INTRA_EVENT,
                const.StdDev.INTER_EVENT]

the returned stddev list will contain six arrays: the first three will include the point-source inflation, and the second three will not.

shakelib.multigmpe.filter_gmpe_list(gmpes, wts, imt)

Method to remove GMPEs from the GMPE list that are not applicable to a specific IMT. Rescales the weights to sum to one.

Parameters:

• gmpes (list) – List of GMPE instances.

• wts (list) – List of floats indicating the weight of the GMPEs.

• imt (IMT) – OQ IMT to filter GMPE list for.

Returns:

List of GMPE instances and list of weights.

Return type:

tuple

shakelib.multigmpe.get_gmpe_sa_periods(gmpe)

Method to extract the SA periods defined by a GMPE.

Parameters:

gmpe (GMPE) – A GMPE instance.

Retunrs:

list: List of periods.

shakelib.multigmpe.get_gmpe_coef_table(gmpe)

Method for finding the (or “a”) GMPE table.

Notes

• The reason for the complexity here is that there can be multiple coefficient tables, and some of them may not have the sa_coeffs attribute, which is the main reason for getting the table.

• We are also assuming that if there are more than one coefficient table, the range of periods will be the same across all of the tables.

Parameters:

gmpe (GMPE) – An OQ GMPE instance.

Returns:

The associated coefficient table.