Physics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.164...23o&link_type=abstract
Earth and Planetary Science Letters, Volume 164, Issue 1-2, p. 23-30.
Physics
15
Scientific paper
We have identified the seismic phase /PKJKP, traveling through the inner core of the Earth as a shear wave, in intermediate-period (2-10 s) records of the deep 1996 Flores Sea earthquake at eight stations of the French seismic network. This constitutes direct evidence of the solidity of the inner core which, while generally recognized, was until now only inferred from indirect evidence. The arrival times on stacked seismograms require a shear-wave velocity at the top of the inner core βICB=3.65 km/s in agreement with values suggested from normal mode observations. Julian et al.'s 1972 observation of a lower velocity (2.95 km/s) is easily reconciled with our result if interpreted as the surface reflection /pPKJKP. The high Poisson ratio /(ν=0.44) can be reconciled with a normal crystalline structure without invoking partial melting on account of the overwhelming pressure at the center of the Earth.
Cansi Yves
Okal Emile A.
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