Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...74...55n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 74, Issue 1-2, p. 55-62.
Physics
16
Scientific paper
Short-period vertical seismograms from ten earthquakes and one nuclear explosion in the distance range of 140-170 degrees are examined for a study of the anelastic properties of the inner core. The depth of the earthquake foci varies between 116 and 625 km. The phases of interest are PKP(BC branch) and PKIKP with bottoming depths in the upper few hundred kilometers of the inner core. The data consist of high-quality digital data at sampling rates 20/40 samples per second selected after an extensive search of the 1985-1986 GDSN event tapes for short-period P waves with a high signal-to-noise ratio. The results are based primarily upon observations between distances of 147° and 154°. Useful information regarding the attenuation characteristics of the region below the inner core boundary (ICB) can be obtained from the observed relative amplitude and frequency content of the PKIKP and PKP(BC) phases. We have used Fourier spectral ratios of PKIKP-PKP(BC) for the estimation of the attenuation along the inner core segment of the ray path. Because of the limited frequency band of the data, it is difficult to resolve any frequency dependence for Q. Within the depth range of 150-300 km below the inner core boundary, the data yield a maximum likelihood estimate of 175 for the mean estimate of Qα, with no clear indication of depth dependence.
Johnson Leah R.
Niazi Mansour
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