Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.164..441i&link_type=abstract
Geophysical Journal International, Volume 164, Issue 2, pp. 441-448.
Astronomy and Astrophysics
Astronomy
2
Amplitude Spectral Ratio, Inner Core, Pacific Ocean, Pkp-Phases Attenuation, Qp Factor, South America
Scientific paper
QP factor at the top of the inner core (IC) is derived using the amplitude spectral ratio (PKPbc versus PKPdf) method applied to the waveforms of suitable, strong (magnitude >6.0) intermediate depth and deep (h > 150 km) earthquakes recorded at some selected South American stations. In most cases, the sampled volume of the IC is centred beneath the Pacific Ocean, but some QP values correspond to volumes under South Africa and under Northern Atlantic. The obtained value of QP is 323 +/- 16 (at 95 per cent confidence level), close to a normal (Gaussian) distribution. The maximum depth of penetration of the PKPdf phase into the IC is roughly 333 km, suggesting a possible increase of QP with depth, although the large scatter in data prevents a definite conclusion. As regards the geographical patterns no variation was observed.
de Farias Caixeta Daniel
de Melo Arraes Tassia
Ivan Marian
Marza Vasile
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