Spectral analyses of high-frequency pn, sn phases from very shallow focus earthquakes. Interim technical report 1 December 78-30 November 80
Hydrophone recordings from July 1979 through November 1980 have been examined for mantle-refracted P phases from underground nuclear explosions and from earthquakes at comparable distances. Explosion generated P phases are found to have a lack of energy relative to earthquake generated P phases for frequencies below about 1.3 Hz. Corner frequencies for explosion P's appear to be around 2 Hz while for earthquake P's these frequencies are lower than 1 Hz. Average amplitudes for explosion P's are higher than for earthquake P's for all recorded frequencies above 2 Hz, in spite of the fact that the average explosion magnitude is less than average earthquake magnitude. In the 2.5 to 2.9 Hz range explosion P's are at least 6 db higher than earthquake P's.
- Research Organization:
- Hawaii Univ., Honolulu (USA). Hawaii Inst. of Geophysics
- OSTI ID:
- 5703799
- Report Number(s):
- AD-A-096974/1
- Country of Publication:
- United States
- Language:
- English
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45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
EARTHQUAKES
SEISMIC WAVES
COMPARATIVE EVALUATIONS
UNDERGROUND EXPLOSIONS
BACKGROUND NOISE
NUCLEAR EXPLOSIONS
PACIFIC OCEAN
SEISMIC DETECTORS
EXPLOSIONS
MEASURING INSTRUMENTS
NOISE
SEAS
SEISMIC ARRAYS
SEISMIC EVENTS
SURFACE WATERS
580201* - Geophysics- Seismology & Tectonics- (1980-1989)
450200 - Military Technology
Weaponry
& National Defense- Nuclear Explosions & Explosives