Full text loading...
-
The mantle disruptions by P-waves velocity gradients analysis under East of Ukrainian Shield
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 18th International Conference on Geoinformatics - Theoretical and Applied Aspects, May 2019, Volume 2019, p.1 - 6
Abstract
A new approach for the mantle boundaries definition based on the successive velocity derivatives calculations is tested. New velocity gradients distributions were obtained for the two megablocks of the Ukrainian Shield, namely Middle-Dniper and Azov megablocks and its neighborhood. An analysis of the distribution of velocity gradients of P-waves within the upper mantle in the depth range of 50–650 km was made. It results in the identification of a series of additional gradient velocity boundaries. These boundaries lay within the framework of the three structural horizons of the upper mantle (under ~ 200– 300 km, ~ 410–500 km, and ~ 600–650 km). Meanwhile, it is untimely to draw any clear conclusions on their geological nature. We should do checking the stability and resolution of the approach before by the independent seismological methods, including the methods of reflected waves, whose resolution is independent of wavelengths.