V.V. Gordienko, L.Ya. Gordienko. A VELOCITY MODEL FOR THE UPPER MANTLE BENEATH MIDOCEAN RIDGES

https://doi.org/10.15407/gpimo2016.01.033

Geology and Mineral Resources of World Ocean 2016, 12 (1): 33-42

V.V. Gordienko, L.Ya. Gordienko 

Institute of Geophysics of NAS of Ukraine, Kyiv

A VELOCITY MODEL FOR THE UPPER MANTLE BENEATH MIDOCEAN RIDGES 
According to the arrival time of the Pwaves from earthquakes beneath midocean ridges Arctic, Atlantic, Pacific and Indian Oceans Hodographs are built at distances up to 25 degrees. It is possible to establish the distribution of speeds up to depths of about 450—500 km. It is established the low velocity zone in the upper mantle from 90 to 240 km, where the partial melting of the rocks is probably. 
Key words: mid-ocean ridges, the velocity of seismic waves. 

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