Accession Number:

AD0875070

Title:

TFO and UBO Long-Period Array Data Analysis

Descriptive Note:

Technical rept. no. 8

Corporate Author:

TEXAS INSTRUMENTS INC DALLAS SERVICES GROUP

Personal Author(s):

Report Date:

1970-08-12

Pagination or Media Count:

63.0

Abstract:

Results of the analysis of two long-period noise samples from Tonto Forest Seismological Observatory TFO and three from Uinta Basin Seismological Observatory UBO are presented. Analysis methods include single channel power density spectra, determination of multichannel coherences, and computation of two-dimensional frequency-wavenumber spectra. Results are compared to results obtained earlier from the Montana Large Aperture Seismic Array the noise fields at the three sites are found to be generally similar. Comparison of array processing methods for the UBO and TFO data indicate that little more than 2 db noise suppression improvement above the 6-7 db obtainable by beamsteer processing can be expected from multichannel filter processing. There is some evidence of acoustically coupled low-frequency propagating noise in the TFO data.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE