Statistics – Computation
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3619303z&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 19, CiteID L19303
Statistics
Computation
1
Seismology: Body Waves, Seismology: Mantle (1212, 1213, 8124), Computational Geophysics: Modeling (4255)
Scientific paper
Between 105-115° degrees, the SKS waveform is complicated by the formation of SPdKS, a wave that has segments of P diffraction along the core mantle boundary. While previous studies have primarily focused on the move-out of SPdKS from SKS, we analyze the concomitant reduction of the SKS amplitude. Long-period SKKS/SKS amplitude ratios present a coherent global pattern. SKKS/SKS is relatively large in North and South American recordings of deep Tonga-Fiji earthquakes but PREM-like in European recordings of earthquakes in South America and North American recordings of earthquakes in Indonesia. Modeling of SKKS/SKS indicate that Ultra-Low Velocity Zones (ULVZs), layers at the base of the mantle with a thickness of about 10-20 km and a shear velocity reduction between 20-30%, are required to explain high SKKS/SKS ratios and the early move-out of SPdKS.
Ritsema Jeroen
Thorne Michael S.
Zhang Yang
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