Accession Number : AD0855346

Title :   Analysis of the Wichita Mountains Seismological Observatory Ambient Noise Spectral Lines.

Descriptive Note : Advanced Array Research Special rept. no. 10,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV

Personal Author(s) : Burg, John P. ; Lu, Chyl H.

Report Date : 09 MAY 1969

Pagination or Media Count : 37

Abstract : A long sample of Wichita Mountains Seismological Observatory short-period ambient noise is analyzed to determine the source and propagation mode of the energy appearing as narrow lines in the noise spectrum. Rayleigh wave propagation from the northeast is inferred from the study of phase spectra. A time-domain technique for predicting extremely narrow-line spectral components so that they may be removed by subtraction is demonstrated for a 13-element array. The technique is highly effective and it appears that its use would be most beneficial at stations having narrow spectral lines in the ambient noise at frequencies in the signal band. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, NOISE), (*UNDERGROUND EXPLOSIONS, DETECTION), POWER SPECTRA, SEISMOMETERS, PHASED ARRAYS, LINE SPECTRA, MATHEMATICAL PREDICTION, EARTHQUAKES, SPECTRUM SIGNATURES, RAYLEIGH WAVES, NUCLEAR EXPLOSIONS, OKLAHOMA.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE