gov.usgs.earthquake.nshmp.gmm

Class ZhaoEtAl_2006

java.lang.Object

gov.usgs.earthquake.nshmp.gmm.ZhaoEtAl_2006

All Implemented Interfaces:

GroundMotionModel

public abstract class ZhaoEtAl_2006
extends Object
implements GroundMotionModel

Abstract implementation of the subduction ground motion model by Zhao et al. (2006). This implementation matches that used in the USGS NSHM.

This model supports both slab and interface type events. In the 2008 NSHMP, the 'interface' form is used with the Cascadia subduction zone models and the 'slab' form is used with gridded 'deep' events in northern California and the Pacific Northwest.

Note: Direct instantiation of GroundMotionModels is prohibited. Use Gmm.instance(Imt) to retrieve an instance for a desired Imt.

Implementation notes:

• When used for interface events, sigma is computed using the generic value of tau, rather than the interface specific value (see inline comments for more information).
• Hypocentral depths for interface events are fixed at 20km.
• Hypocentral depths for slab events are set to min(zTop, 125); minimum rupture distance (rRup) is 1.0 km.
• Support for spectral period 0.75s is provided using interpolated coefficients ported from USGS legacy Fortran implementations.
• Support for spectral period 0.01s is provided using the same coefficients as PGA.
• Support for spectral periods 0.02s, 0.03s, and 0.075s is provided via interpolation of ground motion and sigma of adjacent periods for which there are coefficients.
• Support for spectral periods 7.5s and 10.0s is provided via extrapolation using the 2014 and 2018 NSHM GMM logic tree reference values for slab and interface source types, scaled by the ratio at 5.0s.

Reference: Zhao, J.X., Zhang, J., Asano, A., Ohno, Y., Oouchi, T., Takahashi, T., Ogawa, H., Irikura, K., Thio, H.K., Somerville, P.G., Fukushima, Y., and Fukushima, Y., 2006, Attenuation relations of strong ground motion in Japan using site classification based on predominant period: Bulletin of the Seismological Society of America, v. 96, p. 898–913.

doi: 10.1785/0120050122

Component: Geometric mean of two horizontal components

Author:

Peter Powers

See Also:

Gmm.ZHAO_06_INTERFACE, Gmm.ZHAO_06_SLAB, Gmm.ZHAO_06_INTERFACE_BASIN_AMP, Gmm.ZHAO_06_SLAB_BASIN_AMP

Method Summary

Modifier and Type	Method and Description
ScalarGroundMotion	calc(GmmInput in) Compute the scalar ground motion and its standard deviation for the supplied arguments.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

calc

public final ScalarGroundMotion calc(GmmInput in)

Description copied from interface: GroundMotionModel

Compute the scalar ground motion and its standard deviation for the supplied arguments.

Specified by:

calc in interface GroundMotionModel

Parameters:

in - a ground motion model input argument container

Returns:

a scalar ground motion wrapper