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High Frequency Ground Motion High-Simulation Using a Source- and Site-Specific Empirical Green’s Function Approach

Mourhatch, R. and Krishnan, S. (2012) High Frequency Ground Motion High-Simulation Using a Source- and Site-Specific Empirical Green’s Function Approach. In: 15th World Conference in Earthquake Engineering. International Association for Earthquake Engineering , pp. 1-8.

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A key limitation of seismic wave propagation simulations is that the seismic wave-speed structure of the earth is not well resolved for propagating high-frequency waves. The high frequencies in the ground motion must be simulated through other means. Toward this end, we adopt the classical empirical Green's function (EGF) approach of summing recorded seismograms from past small earthquakes with suitable time-shifts to generate seismograms for large events. Whereas, in the past, the magnitude of events used as EGFs were limited to within 1 or 2 units of the target event’s magnitude, this source- and site-specific approach allows us to use vast number of seismograms from very small earthquakes (magnitudes 2.5-3.5) as EGFs to produce the high-frequency content of large earthquakes. We are expanding the envelope of the empirical Green’s functions approach by using large number of seismograms from small earthquakes as EGFs to produce high frequency content of large earthquakes.

Item Type:Book Section
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URLURL TypeDescription
Mourhatch, R.0000-0001-8037-726X
Krishnan, S.0000-0002-2594-1523
Additional Information:We thank Chen Ji (UCSB) and Martin Mai (KAUST) for providing source models from past earthquakes, Dimitri Komatitsch (University of Pau, France) for insights into SPECFEM3D, Carl Tape (UAF) for providing the wave-speed model for SPECFEM3D, Thomas Heaton (Caltech) and Robert Graves (USGS Pasadena) for their insights into the Empirical Green’s Function method and ground motion simulations. We gratefully acknowledge the funding provided by the National Science Foundation (NSF Award No. 0926962)
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Subject Keywords:Empirical Green's Function, High Frequency Ground Motions
Record Number:CaltechAUTHORS:20130306-081454955
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37332
Deposited By: Tony Diaz
Deposited On:28 Jun 2013 20:55
Last Modified:03 Oct 2019 04:46

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