gov.usgs.earthquake.nshmp.gmm

Class YoungsEtAl_1997

java.lang.Object

gov.usgs.earthquake.nshmp.gmm.YoungsEtAl_1997

All Implemented Interfaces:

GroundMotionModel

public abstract class YoungsEtAl_1997
extends Object
implements GroundMotionModel

Abstract implementation of the subduction ground motion model by Youngs et al. (1997). This implementation matches that used in the 2008 USGS NSHMP where it is sometimes identified as the Geomatrix ground motion model. This implementation has been modified from its original form to an NGA style (S. Harmsen 7/13/2009) wherein mean ground motion varies continuously with Vs30 (sigma remains the same as original). This is acheived through use of a period-dependent site amplification function modified from Boore & Atkinson (2008).

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.

Reference: Youngs, R.R., Chiou, S.-J., Silva, W.J., and Humphrey, J.R., 1997, Strong ground motion ground motion models for subduction zone earthquakes: Seismological Research Letters, v. 68, p. 58-73.

doi: 10.1785/gssrl.68.1.58

Component: Geometric mean of two horizontal components

Author:

Peter Powers

See Also:

Gmm.YOUNGS_97_INTERFACE, Gmm.YOUNGS_97_SLAB

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