(U) THIS PAPER REPORTS ON THE MATHEMATICAL BASIS FOR A NEW FD-TD METHOD FOR SIMULATING PROPAGATING SEISMIC SIGNALS. THE TECHNIQUE USES A CURVED COORDINATE SYSTEM THAT CONFORMS TO THE SURFACE TOPOGRAPHY OF THE EARTH. THE ALGORITHUM HAS BEEN PARALLELIZED FOLLOWING A DOMAIN DECOMPOSITION STRATEGY. FOR PORTABILITY IT IS WRITTEN IN FORTRAN 77 AND USES THE STANDARD MPI SUBROUTINE LIBRARY TO DISTRIBUTE SUB-DOMAINS ACROSS A PROCESSOR MESH. THE CODE HAS BEEN ...
(U) THIS PAPER DETERMINES THE SEISMIC TO ACOUSTIC SIGNAL COUPLING RATIO (SAR) USING SIGNALS GENERATED BY MOVING MILITARY VEHICLES. THIS IS USEFUL IN SITUATIONS WHERE A CONTROLLED SOURCE CANNOT BE USED, OR WHEN THE PROPERTIES OF THE GROUND SURFACE ARE CHANGING, SUCH AS IN SNOW-COVERED OR FREEZING GROUND. IN THESE CASES THE SAR WILL ASLO CHANGE, ANDN IT IS CONVENIENT TO HAVE METHODS THAT DO NOT REQUIRE A CAREFULLY CONTROLLED ...
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