V.V. Gordienko, L.Ya. Gordienko. A VELOCITY MODEL FOR THE UPPER MANTLE BENEATH ISLAND ARCS AND THE COASTAL RIDGES PACIFIC OCEAN

V.V. Gordienko, L.Ya. Gordienko
Institute of Geophysics of NAS of Ukraine, Kyiv
A VELOCITY MODEL FOR THE UPPER MANTLE BENEATH ISLAND ARCS AND THE COASTAL RIDGES PACIFIC OCEAN
According to the arrival time of P-waves from earthquakes under island arcs and coastal ridges around the Pacific Ocean traveltime curves are constructed at distances up to 25 degrees. This allowed to estimate the velocity distribution up to a depth of about 450—500 km. It is defined low-velocity zone in the upper mantle from the Moho to a depth of about 150—200 km. Partial melting of rocks would be expected in the central part of this zone.
Key words: speed section, mantle, asthenosphere, island arcs.

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