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Highly accurate P‐SV complete synthetic seismograms using modified DSM operators
Author(s) -
Takeuchi Nozomu,
Geller Robert J.,
Cummins Phil R.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00973
Subject(s) - seismogram , cartesian coordinate system , algorithm , workstation , computer science , computational science , mathematics , geometry , geology , seismology , operating system
In previous papers [ Cummins et al., 1994ab] (hereafter referred to as DSMI and DSMII respectively), we presented accurate methods for computing complete synthetic seismograms for SH and P‐SV respectively in a spherical earth model. The SH calculations used computationally efficient modified matrix operators, but the P‐SV synthetics were computationally intensive. Geller and Takeuchi [1995] (hereafter referred to as GT95) presented a general theory for deriving modified operators and gave the explicit form of the modified operators for the P‐SV case in cylindrical or cartesian coordinates. In this paper we extend GT95's results to derive modified operators for the P‐SV case in spherical coordinates. The use of the modified operators reduces the CPU time by a factor of about 5 without a loss of accuracy. 10 CPU min on a SPARC‐20 workstation with one CPU are required to compute a profile of synthetic seismograms from DC to 20 sec period.