N. Takeuchi et al., HIGHLY ACCURATE P-SV COMPLETE SYNTHETIC SEISMOGRAMS USING MODIFIED DSM OPERATORS, Geophysical research letters, 23(10), 1996, pp. 1175-1178
In previous papers [Cummins et al., 1994ab] (hereafter referred to as
DSMI and DSMII respectively), we presented accurate methods for comput
ing complete synthetic seismograms for SH and P-SV respectively in a s
pherical earth model. The SH calculations used computationally efficie
nt modified matrix operators, but the P-SV synthetics were computation
ally intensive. Geller and Takeuchi [1995] (hereafter referred to as G
T95) presented a general theory for deriving modified operators and ga
ve the explicit form of the modified operators for the P-SV case in cy
lindrical or cartesian coordinates. In this paper rye extend GT95's re
sults to derive modified operators for the P-SV case in spherical coor
dinates, The use of the modified operators reduces the CPU time by a f
actor 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 syntheti
c seismograms from DC to 20 sec period.