FINDIF : a software package to create synthetic seismograms by finite differences
Hunt, Mary M.
Stephen, Ralph A.
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In order to study seismic wave propagation through laterally varying sea floor structures, a software package has been created to generate synthetic seismograms by finite differences. The elastic wave equation can be solved in two dimensions either for point sources in cylindrical coordinates or for line sources in rectangular coordinates. Vertical and radial variations of the elastic parameters are allowed. The package includes four programs. Input to the system consists of a short file containing parameter values to describe the model. The first program is used to initialize the system for the particular model being used. The source arrays and velocity matrices are each computed by a separate program. The final program, which actually carries out the finite difference calculations, includes six subroutines to implement different options based on alternative finite difference formulations. Two different kinds of output files are created by this program: one or more snap-shot files, and one time series file, which will usually include more than one series.
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Analysis of seafloor seismograms of the 2003 Tokachi-Oki earthquake sequence for earthquake early warning McGuire, Jeffrey J.; Simons, Frederik J.; Collins, John A. (American Geophysical Union, 2008-07-31)Earthquake Early Warning (EEW) algorithms estimate the magnitude of an underway rupture from the first few seconds of the P-wave to allow hazard assessment and mitigation before the S-wave arrival. Many large subduction-zone ...
Allen, Julie M.; Burns, D. R. (Woods Hole Oceanographic Institution, 1989-10)A three dimensional, second order finite difference method was used to create synthetic seismograms for elastic wave propagation in heterogeneous media. These synthetic seismograms are used to model rough seafloor, the ...
Allen, Julie M.; Stephen, Ralph A. (Woods Hole Oceanographic Institution, 1991-09)During the past six months, the two-dimensional finite difference synthetic seismogram code was installed and run on a number of different computer systems. The results were compared for timing, accuracy and the ease with ...