Youngs et al. 1997¶

class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997SInter
[source]¶ Implements GMPE developed by R.R Youngs, SJ, Chiou, W.J. Silva, J.R. Humphrey and published as “Strong Ground Motion Attenuation Relationships for Subduction Zone Earthquakes” (Seismological Research Letters Volume 68, No. 1, pages 5873, 1997). This class implements the equations for ‘Subduction Interface’ (that’s why the class name ends with ‘SInter’). Mean value for SA at 4 s on rock (not originally supported) is obtained from mean value at 3 s divided by a factor equal to 0.399 (scaling factor computed in the context of the SHARE project obtained as average ratio between median values at 4 and 3 seconds as predicted by SHARE subduction GMPEs).

COEFFS_ROCK
= <openquake.hazardlib.gsim.base.CoeffsTable object>¶ Coefficient table containing rock coefficients, taken from table 2, p. 67

COEFFS_SOIL
= <openquake.hazardlib.gsim.base.CoeffsTable object>¶ Coefficient table containing soil coefficients, taken from table 2, p. 67

CONSTS
= {'A2_rock': 1.414, 'A7_rock': 0.3846, 'A3_soil': 10, 'A6_soil': 0.00648, 'A7_soil': 0.3643, 'A4_rock': 1.7818, 'A5_rock': 0.554, 'A4_soil': 1.097, 'A5_soil': 0.617, 'A2_soil': 1.438, 'A1_soil': 0.6687, 'A1_rock': 0.2418, 'A3_rock': 10, 'A6_rock': 0.00607}¶ constants for mean value calculation, see table 2, page 67.

DEFINED_FOR_INTENSITY_MEASURE_COMPONENT
= 'Average horizontal'¶ Supported intensity measure component is the average horizontal component

DEFINED_FOR_INTENSITY_MEASURE_TYPES
= set([<class 'openquake.hazardlib.imt.PGA'>, <class 'openquake.hazardlib.imt.SA'>])¶ Supported intensity measure types are spectral acceleration, and peak ground acceleration, see table 2, page 67.

DEFINED_FOR_STANDARD_DEVIATION_TYPES
= set(['Total'])¶ Supported standard deviation types is total, table 2, page 67.

DEFINED_FOR_TECTONIC_REGION_TYPE
= 'Subduction Interface'¶ Supported tectonic region type is subduction interface

REQUIRES_DISTANCES
= set(['rrup'])¶ Required distance measure is Rrup, see equations 1 and 2, page 59 and 66, respectively.

REQUIRES_RUPTURE_PARAMETERS
= set(['hypo_depth', 'mag'])¶ Required rupture parameters are magnitude and focal depth, see equations 1 and 2, pages 59 and 66, respectively.

REQUIRES_SITES_PARAMETERS
= set(['vs30'])¶ Required site parameters is Vs30, used to distinguish between rock and soil sites, see paragraph ‘Strong Motion Data Base’, page 59.

ROCK_VS30
= 760¶ Vs30 value representing typical rock conditions in California.

get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.


class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997SSlab
[source]¶ Implements GMPE developed by R.R Youngs, SJ, Chiou, W.J. Silva, J.R. Humphrey and published as “Strong Ground Motion Attenuation Relationships for Subduction Zone Earthquakes” (Seismological Research Letters Volume 68, No. 1, pages 5873, 1997). This class implements the equations for ‘Subduction IntraSlab’ (that’s why the class name ends with ‘SSlab’). Mean value for SA at 4 s on rock (not originally supported) is obtained from mean value at 3 s divided by a factor equal to 0.399 (scaling factor computed in the context of the SHARE project obtained as average ratio between median values at 4 and 3 seconds as predicted by SHARE subduction GMPEs).

DEFINED_FOR_TECTONIC_REGION_TYPE
= 'Subduction IntraSlab'¶ Supported tectonic region type is subduction intraslab

get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.


class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997GSCSSlabBest
[source]¶ Implement modification to
YoungsEtAl1997SSlab
as defined by GSC (Geological Survey of Canada) for the 2010 Western Canada Model. Includes adjustement for firm ground. The model is associated to the ‘Best’ case, that is mean value unaffected.
get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.


class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997GSCSSlabUpperLimit
[source]¶ Implement modification to
YoungsEtAl1997SSlab
as defined by GSC (Geological Survey of Canada) for the 2010 Western Canada Model. Includes adjustement for firm ground. The model is associated to the ‘Upper Limit’ case, that is mean value plus 0.7 natural logarithm.
get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.


class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997GSCSSlabLowerLimit
[source]¶ Implement modification to
YoungsEtAl1997SSlab
as defined by GSC (Geological Survey of Canada) for the 2010 Western Canada Model. Includes adjustement for firm ground. The model is associated to the ‘Lower Limit’ case, that is mean value minus 0.7 natural logarithm.
get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.


class
openquake.hazardlib.gsim.youngs_1997.
YoungsEtAl1997SInterNSHMP2008
[source]¶ Extends
YoungsEtAl1997SInter
and fix rupture hypocenter depth at 20 km as defined by the National Seismic Hazard Mapping Project (NSHMP) for the 2008 US model.The class implement the equation as coded in
subroutine getGeom
inhazSUBXnga.f
Fortran code available at: http://earthquake.usgs.gov/hazards/products/conterminous/2008/software/
get_mean_and_stddevs
(sites, rup, dists, imt, stddev_types)[source]¶ See
superclass method
for spec of input and result values.Call superclass method by passing new rupture context object with hypocentral depth set to 20 km
