The Low Frequency Spectral Minimum in Underground Explosion P Spectra

We confirm that a very low frequency discriminant, i.e., the hole due to pP interference, located at the lower extreme of underground nuclear explosion spectra, is preserved in short-period seismic recordings. This is shown repeatedly, from subarray to subarray, in comparisons of (Amchitka Test) LON...

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Bibliographic Details
Main Author: Smart, Gene
Format: Report
Language:English
Subjects:
ALEUTIAN ISLANDS
AMCHITKA(ALASKA)
CONTROL
DEPTH
DEPTH OF BURIAL
DISCRIMINATE ANALYSIS
EARTH(PLANET)
EARTHQUAKES
INSTRUMENTATION
INTERFERENCE
LONGSHOT SHOT
LOW FREQUENCY
LPN-VT/3709/B/PMP
NUCLEAR EXPLOSION TESTING
NUCLEAR EXPLOSIONS
PP INTERFERENCE
PRIMARY WAVES(SEISMIC WAVES)
RECORDING SYSTEMS
REMOVAL
RESPONSE
SEISMIC DATA
SEISMIC WAVES
Seismology
SHORT RANGE(TIME)
SPECTRA
SPECTRUM ANALYSIS
UNDERGROUND EXPLOSIONS
VERY LOW FREQUENCY
ZERO FREQUENCY SPECTRAL HOLE
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Summary:We confirm that a very low frequency discriminant, i.e., the hole due to pP interference, located at the lower extreme of underground nuclear explosion spectra, is preserved in short-period seismic recordings. This is shown repeatedly, from subarray to subarray, in comparisons of (Amchitka Test) LONGSHOT with a control earthquake, in recordings of those events made at LASA. The discriminant, previously neglected as falling outside seismometer spectral range, is available with present recording systems. To isolate the pP effect for observation the explosion spectra are, in effect, divided by the spectral of the control earthquake, removing interference of earth and instrument responses. It is not clear whether use of a control earthquake is unavoidable. Keywords include: Zero-frequency spectral hole; Depth of burial; and pP interference. Sponsored in part by DARPA.