Accession Number:

ADA109304

Title:

Removal of Multipath Effects in the Estimation of Rayleigh Wave Spectra

Descriptive Note:

Semi-annual technical rept. for period ending 1 Sep 75

Corporate Author:

SOUTHERN METHODIST UNIV DALLAS TX DALLAS GEOPHYSICAL LAB

Personal Author(s):

Report Date:

1975-09-01

Pagination or Media Count:

29.0

Abstract:

The effects of multipathing on the Rayleigh spectrum mask depth- dependent spectral zeroes and cause significant errors in magnitude determinations. A new technique, called phase equilization filtering, is introduced for the purpose of eliminating multipath effects. The technique is demonstrated to be effective on synthetic signals in which the undisturbed spectrum is known. In a typical case, an 18-dB spectral hole at a period of 20 seconds, caused by multipathed energy arriving only 30 seconds later than the primary arrival, was essentially eliminated. The usefulness of the technique is also demonstrated by application to teleseismic Rayleigh waves. Author

Subject Categories:

  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE