Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations
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. A...
Published in: | Pure and Applied Geophysics |
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Language: | English |
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2015
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Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973 |
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_973973 2023-05-15T17:33:19+02:00 Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations Ivan, M. Ghica, D. Gosar, A. Hatzidimitriou, P. Hofstetter, R. Polat, G. Wang, R. 2015 https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1007/s00024-014-0859-y info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1007/s00024-014-0859-y https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973 Pure and Applied Geophysics info:eu-repo/semantics/article 2015 ftgfzpotsdam https://doi.org/10.1007/s00024-014-0859-y 2022-09-14T05:56:28Z 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. Article in Journal/Newspaper North Atlantic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Pure and Applied Geophysics 172 2 283 293 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Ivan, M. Ghica, D. Gosar, A. Hatzidimitriou, P. Hofstetter, R. Polat, G. Wang, R. |
spellingShingle |
Ivan, M. Ghica, D. Gosar, A. Hatzidimitriou, P. Hofstetter, R. Polat, G. Wang, R. Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
author_facet |
Ivan, M. Ghica, D. Gosar, A. Hatzidimitriou, P. Hofstetter, R. Polat, G. Wang, R. |
author_sort |
Ivan, M. |
title |
Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
title_short |
Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
title_full |
Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
title_fullStr |
Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
title_full_unstemmed |
Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan, East Mediterranean, and American Stations |
title_sort |
lowermost mantle velocity estimations beneath the central north atlantic area from pdif observed at balkan, east mediterranean, and american stations |
publishDate |
2015 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Pure and Applied Geophysics |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00024-014-0859-y info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1007/s00024-014-0859-y https://gfzpublic.gfz-potsdam.de/pubman/item/item_973973 |
op_doi |
https://doi.org/10.1007/s00024-014-0859-y |
container_title |
Pure and Applied Geophysics |
container_volume |
172 |
container_issue |
2 |
container_start_page |
283 |
op_container_end_page |
293 |
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1766131796069580800 |