Geomatrix_1993 (nshmp-lib)

java.lang.Object
- gov.usgs.earthquake.nshmp.gmm.Geomatrix_1993

All Implemented Interfaces:

GroundMotionModel
```
public class Geomatrix_1993
extends Object
implements GroundMotionModel
```
Implementation of the subduction interface ground motion model by Geomatrix consultants (1993) to support the 2007 Alaska NSHM. In the fortran codes used at the time, this GMM is noted as a 'Youngs and Coppersmith variation'. Although similar to Youngs et al. (1997), that GMM has quite a few add ons for site terms not supported or required by the 2007 Alaska NSHM such that it is simpler to have a standalone implementation.
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:

U.S. Geological Survey

See Also:

Gmm.GEOMATRIX_93_INTERFACE, Gmm.GEOMATRIX_93_SLAB

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`LogicTree<GroundMotion>`	`calc(GmmInput in)`	Computes a logic tree of scalar ground motions and standard deviations for the supplied arguments.
`Imt`	`imt()`	The intensity measure type (`IMT`) of this GMM instance.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface gov.usgs.earthquake.nshmp.gmm.GroundMotionModel
dampedCalc

- Method Detail
  - imt
```
public Imt imt()
```
    Description copied from interface: GroundMotionModel
    
    The intensity measure type (IMT) of this GMM instance.
    
    Specified by:
    
    imt in interface GroundMotionModel
  - calc
```
public final LogicTree<GroundMotion> calc(GmmInput in)
```
    Description copied from interface: GroundMotionModel
    
    Computes a logic tree of scalar ground motions and standard deviations for the supplied arguments. This method is implemented by GMMs to provide the horizontal peak ground acceleration and (optionally) velocity (PGA, PGV) as well as 5% damped pseudo-spectral acceleration for periods between 0.01 s and 10 s. For most modern GMMs, ground motions are computed as the average horizontal component (RotD50) but many older GMMs use some other average horizontal measure (e.g. GMRotI50).
    
    Specified by:
    
    calc in interface GroundMotionModel
    
    Parameters:
    
    in - a ground motion model input argument container