Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area 
from Pdif Observed at Balkan, East Mediterranean, and American Stations

Ivan, Marian; Ghica, Daniela Veronica; Gosar, Andrej; Hatzidimitriou, Panagiotis; Hofstetter, Rami; Polat, Gulten; Wang, R.

doi:10.1007/s00024-014-0859-y

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Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations

Authors

Ivan, Marian
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

Ghica, Daniela Veronica
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

Gosar, Andrej
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

Hatzidimitriou, Panagiotis
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

Hofstetter, Rami
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

Polat, Gulten
External Organizations;
GEOFON, Deutsches GeoForschungsZentrum;

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Wang, R.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GEOFON, Deutsches GeoForschungsZentrum;

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Citation

Ivan, M., Ghica, D. V., Gosar, A., Hatzidimitriou, P., Hofstetter, R., Polat, G., Wang, R. (2015): Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations. - Pure and Applied Geophysics, 172, 2, 283-293.
https://doi.org/10.1007/s00024-014-0859-y

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973

Abstract

Lowermost mantle velocity in the area 15°S–70°N latitude/60°W–5° W longitude is estimated using two groups of observations, complementary to each other. There are 894 Pdif observations at stations in the Balkan and Eastern Mediterranean areas from 15 major earthquakes in Central and South America. Another 218 Pdif observations are associated with four earthquakes in Greece/Turkey and one event in Africa, recorded by American stations. A Pdif slowness tomographic approach of the structures immediately above the core-to-mantle boundary (CMB) is used, incorporating corrections for ellipticity, station elevation and velocity perturbations along the ray path. A low-velocity zone above CMB with a large geographical extent, approximately in the area (35–65°N) × (40–20°W), appears to have the velocity perturbations exceeding the value actually assumed by some global models. Most likely, it is extended beneath western Africa. A high-velocity area is observed west of the low-velocity zone. The results suggest that both Cape Verde and Azorean islands are located near transition areas from low-to-high velocity values in the lowermost mantle.