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Bulletin of the Seismological Society of America; February 1983; v. 73; no. 1; p. 143-155
© 1983 Seismological Society of America
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An error analysis of frequency-time analysis

CHI-CHIN FENG* and TA-LIANG TENG

DEPARTMENT OF GEOLOGICAL SCIENCES UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES, CALIFORNIA 90089

Abstract

The temporal resolution and accuracy of frequency-time analysis (FTAN) as applied to surface-wave dispersion analysis are examined for a period range from 10 to 200 sec. The constant relative bandwidth filter (Dziewonski et al., 1969), optimum bandwidth filter (Inston et al., 1971), and display-equalized filter (Nyman and Landisman, 1977) are carefully examined with respect to their adequacy of application over a broad period range. Among these Gaussian filters, the optimum bandwidth filter gives a better performance for relatively short-period (less than 50 sec) dispersion measurement. To measure surface-wave dispersion for a broad period range, a "matched-filter FTAN" technique is introduced by modifying the "residual dispersion measurement" technique (Dziewonski et al., 1972). A detailed numerical analysis is made on this new technique; the result demonstrates a significant improvement on both the resolution and the accuracy of surface-wave dispersion data extraction over a broad period range up to at least 200 sec.

Footnotes

* Present address: Shell Oil Company, P.O. Box 527, Houston, Texas 77001.




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Y. ZENG, T.-L. TENG, and K. AKI
Surface-wave mapping of the crust and upper mantle in the Arctic region
Bulletin of the Seismological Society of America, October 1, 1989; 79(5): 1520 - 1541.
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