Abstract
PKiKP and PKIKP phases at distances of 120-142 degrees are used to study the seismic structure of the uppermost 100 km of the inner core. The travel time residuals and waveforms of PKiKP and PKIKP clearly reveal a difference in seismic velocity and Q structure between the eastern hemisphere (40° E - 180° E) and the western hemisphere (180° W - 40° E). The eastern hemisphere has faster isotropic velocities (about 0.8% faster) and higher attenuation compared to the western hemisphere.
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