Velocity sections of the upper mantle under the oceans
© V.V. Gordienko, L.Ya. Gordienko, 2016
We constructed the models of the distribution of longitudinal seismic waves velocities for the upper mantle oceanic regions:
mid-ocean ridges (MOR), basins, trenches, island arcs and coastal ridges, back-arc troughs (BAT). They are in line with the
schemes of advection-polymorphic deep- seated processes in tectonosphere. Under the island arcs and coastal ridges models meet
the alpine geosyncline supplemented with recent activization. Under the MOR and BAT the models coincide. They correspond to the
scheme of recent heat and mass transfer for rifting which on the mafic crust with continental thickness leads to oceanization. The basin
model shows the result of smoothing of thermal anomalies under the MOR or BAT in about 60 million years. The trench model corresponds
to the result of lateral warming-up of upper layers of the mantle of the inactive blocks from the island arc and basin.
Key words: The oceans, the upper mantle, velocity models, deep-seated processes.