Eisner, Leo and Clayton, Robert W.
Equivalent Medium Parameters for Numerical Modeling in Media with Near-Surface Low Velocities.
Bulletin of the Seismological Society of America, 92
- Published Version
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Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20121002-085345466
We have developed a methodology to discretize an isotropic velocity
model with low velocities near the free surface for full waveform numerical modeling.
The method modifies the near-surface minimum velocity in a given (original)
model by replacing parts of the model with equivalent medium parameters (EMP).
The discretized model (with EMP) has a higher minimum velocity and minimizes the
difference between the seismograms evaluated for the original model and the model
with EMP. The method is suitable for studies requiring full waveform numerical
modeling with a limited frequency range (such as a finite-difference full waveform
modeling in a sedimentary basin). The discretized model with EMP is set to match
locally surface-wave velocities evaluated in the original model over the frequency
range of interest. The difference in group velocity calculated for the original vertical
profile and the vertical profile with EMP provides an estimate of the error due to the
modification of the original model.
|Additional Information:||© 2002 by the Seismological Society of America. Manuscript received 1 April 2001. The authors are grateful to Luis Rivera for interesting insights during the development of this method. Special thanks go to Hiroo Kanamori who
not only followed our progress but significantly helped with the determination
of the error criterion. Dimitri Komatitsch greatly helped to make this
manuscript readable and offered his experience to evaluate one of the numerical
tests used in this article. We thank Václav Vavryčuk, Kim Olsen
(reviewer), Ivan Pšenčík, Jeroen Tromp, Jascha Polet, Si-Dao Ni, John Etgen,
and anonymous reviewer for their input when developing this method
and preparing the manuscript. Many of the figures were made with Generic
Mapping Tools software (Wessel and Smith, 1991). This research was supported
by the Southern California Earthquake Center (SCEC). The SCEC
is funded by NSF Cooperative Agreement EAR-8920136 and U.S. Geological
Survey Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-
97AG01718. The SCEC Contribution Number for this article is 524. This is Contribution Number 8820 from the Division of Geological and Planetary
Sciences, California Institute of Technology.|
|Funding Agency||Grant Number|
|Southern California Earthquake Center (SCEC)||UNSPECIFIED|
|Other Numbering System:|
|Other Numbering System Name||Other Numbering System ID|
|Southern California Earthquake Center (SCEC)||524|
|Caltech Division of Geological and Planetary Sciences||8820|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited On:||02 Oct 2012 16:17|
|Last Modified:||31 Jan 2017 21:17|
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