Difference in seismic velocity between the eastern and western hemispheres in the top of the Earth's inner core
Niu, Fenglin; Wen, Lianxing
published: Jan 1, 2003
ArtNo. ESP136000800050, Price: 19.00 €
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".