Package gov.usgs.earthquake.nshmp.gmm

Class SadighEtAl_1997

java.lang.Object
gov.usgs.earthquake.nshmp.gmm.SadighEtAl_1997
All Implemented Interfaces:
GroundMotionModel
public class SadighEtAl_1997 extends Object implements GroundMotionModel
Implementation of the ground motion model for shallow crustal earthquakes by Sadigh et al. (1997). This implementation supports soil and rock sites, the cutoff for which is vs30=750 m/s. This model was also used for subduction interface sources in the 2007 Alaska NSHM, for which a custom magnitude saturation at M=8.5 was added.

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

Reference: Sadigh, K., Chang, C.-Y. , Egan, J.A., Makdisi, F., and Youngs, R.R., 1997, Attenuation relationships for shallow crustal earthquakes based on California strong motion data: Seismological Research Letters, v. 6, n. 1, p. 180-189.

doi: 10.1785/gssrl.68.1.180

Component: geometric mean of two horizontal components

Author:
U.S. Geological Survey
See Also:

  • Method Details

    • 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 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