Accession Number:

AD0848100

Title:

Determination of Source Depth by Spectral, Pseudo-Autocovariance, and Cepstral Analysis.

Descriptive Note:

Seismic data lab. rept.,

Corporate Author:

TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s):

Report Date:

1969-01-24

Pagination or Media Count:

39.0

Abstract:

Interference of P or Pn and pP or pPn produce scalloped spectra with a null period equal to the depth-phase time delay tau. Determination of the null-frequency f 1tau, together with a knowledge of the overburden compressional velocity, permits an estimate of the source depth. Scalloping produced by station site structures is reduced by averaging a suite of station spectra. Further, the spectral band available for analysis is broadened by removing instrument response. To objectively determine periodicities in the average spectrum, the cepstra and pseudo-autocovariance are computed. The depth determination method employing spectral, pseudo-autocovariance, and cepstral analysis is applied to nine Pn and P data sets for five underground explosions. Five sets yielded reasonable estimates of the shot depth. Author

Subject Categories:

  • Seismology
  • Computer Programming and Software
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE