FREQUENCY-WAVE NUMBER ANALYSIS OF SIGNALS AND NOISE RECORDED AT THE UBO VERTICAL ARRAY

Abstract

A Fiji earthquake recorded on 30 December 1966, on a vertical- component vertical array, was analyzed by means of frequency-wave number power spectrum. The distance of the teleseismic event was approximately 85 deg. The ambient noise preceding the signal appeared to be predominately composed of Rayleigh Waves. The signal appeared as expected, but the apparent up-going velocity was about 10-15% lower than the down-going velocity. By imaging the vertical array about the earth's surface the response was sharpened, from .75 cps to 1.75 cps. The coda appeared to display considerable non-linear conversion or scattering phenomena above 1.00 cps. The imaged response of the coda compared with the peak signal indicated substantial energy conversions at high frequencies and energy losses that were larger at higher frequencies.

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Document Details

Document Type
Technical Report
Publication Date
Nov 14, 1967
Accession Number
AD0824090

Entities

People

  • Robert L. Sax

Organizations

  • Teledyne Technologies

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Ambient Noise
  • Classification
  • Commerce
  • Contractors
  • Contracts
  • Conversion
  • Energy
  • Energy Conversion
  • Export Controls
  • Frequency
  • Government (Foreign)
  • Governments
  • Power Spectra
  • Rayleigh Waves
  • Spectra

Readers

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