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Air-coupled seismic waves at long range from Apollo launchings.Microphones and seismographs were co-located in arrays on Skidaway Island, Georgia, for the launchings of Apollo 13 and 14, 374 km to the south. Simultaneous acoustic and seismic waves were recorded for both events at times appropriate to the arrival of the acoustic waves from the source. The acoustic signal is relatively broadband compared to the nearly monochromatic seismic signal; the seismic signal is much more continuous than the more pulse-like acoustic signal; ground loading from the pressure variations of the acoustic waves is shown to be too small to account for the seismic waves; and the measured phase velocities of both acoustic and seismic waves across the local instrument arrays differ by less than 6 per cent and possibly 3 per cent if experimental error is included. It is concluded that the seismic waves are generated by resonant coupling to the acoustic waves along some 10 km of path on Skidaway Island.
Document ID
19720042848
Document Type
Reprint (Version printed in journal)
Authors
Donn, W. L. (City College, New York; Lamont-Doherty Geological Observatory, Palisades N.Y., United States)
Dalins, I. (NASA Marshall Space Flight Center Huntsville, Ala., United States)
Mccarty, V. (Alabama, University Huntsville, Ala., United States)
Ewing, M. (Lamont-Doherty Geological Observatory Palisades, N.Y., United States)
Kaschak , G. (U.S. Army, Signal Corps Fort Monmouth, N.J., United States)
Date Acquired
August 6, 2013
Publication Date
December 1, 1971
Subject Category
PHYSICS, GENERAL
Report/Patent Number
AROD-6997-22-EN
AD-752703
Funding Number(s)
CONTRACT_GRANT: DAAB07-69-C-0250
CONTRACT_GRANT: DAHC04-67-C-0037
CONTRACT_GRANT: DA-ARO(D)-31-124-71-G90
Distribution Limits
Public
Copyright
Other