Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1540
AuthorsAlessandrini, B.* 
Beranzoli, L.* 
Drakatos, G.* 
Falcone, C.* 
Karantonis, G.* 
Mele, F. M.* 
Stavrakakis, G. N.* 
TitleTomographic image of the crust and uppermost mantle of the Ionian and Aegean regions
Issue DateJan-1997
Series/Report no.40/1
URIhttp://hdl.handle.net/2122/1540
Keywordstravel time inversion
ray tracing
subduction
Subject Classification04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 
AbstractWe present a tomographic view of the crust and uppermost mantle beneath the Central Mediterranean area obtained from P-wave arrival times of regional earthquakes selected from the ISC bulletin. The P-wave velocity anomalies are obtained using Thurber's algorithm that jointly relocates earthquakes and computes velocity adjustments with respect to a starting model. A specific algorithm has been applied to achieve a distribution of epicentres as even as possible. A data set of 1009 events and 49072 Pg and Pn phases was selected. We find a low velocity belt in the crust, evident in the map view at 25 km of depth, beneath the Hellenic arc. A low velocity anomaly extends at 40 km of depth under the Aegean back arc basin. High velocities are present at Moho depth beneath the Ionian sea close to the Calabrian and Aegean arcs. The tomographic images suggest a close relationship between P-wave velocity pattern and the subduction systems of the studied area.
Appears in Collections:Annals of Geophysics

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