The Low Frequency Spectral Minimum in Underground Explosion P Spectra

Abstract

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 12, 1984
Accession Number
ADA153795

Entities

People

  • Gene Smart

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Arms Control
  • Atmospheric Sciences
  • Earthquakes
  • Explosions
  • Frequency
  • Geography
  • Geophysics
  • High Resolution
  • International Security
  • Measurement
  • Planetary Sciences
  • Plastic Explosives
  • Recording Systems
  • Shot Noise
  • Very Low Frequency
  • Waves

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Seismology