The DIRECT COURSE-TRINITY Seismic Experiment.
Final rept. Jul 83-Jul 84,
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
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The proximity of the DIRECT COURSE test site to the TRINITY site where the first atomic bomb was detonated in July 1946 offered a unique opportunity to compare the unusual appearing seismic waves recorded on the TRINITY event with those excited by DIRECT COURSE. Two of the Leet Seismographs used to record the 1945 TRINITY event were obtained and fielded on DIRECT COURSE alongside modern digital instrumentation in an effort to verify the TRINITY seismograms. Good records wer ebtained from one of the Leet instruments and from most of the digital instrumentation. Comparison between the Leet records and the digital seismograms indicates that the hydrodynamic wave, first observed at TRINITY, is real and not an instrument phenomenon. Keywords Seismic signals High-explosive tests Surface waves Body waves Source functions Modeling Waveforms.