IASPEI - Picture Gallery

IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy
(S) - IASPEI - International Association of Seismology and Physics of the Earth's
Interior
JSS014 Poster presentation 2306
Preliminary Results of a Seismological Experiment on Mantle Dynamics
and Crustal Structure beneath Isparta Angle
Mr. Ugur Mustafa Teoman
Eric Sandvol, Niyazi Turkelli, Dogan Aksari, Amanda Lough, Cem Destici, Sakir
Sahin, Alev Berberoglu, DoğAn Kalafat
The Isparta Angle (IA) is formed by the intersection of two very different subduction zones: The
Hellenic arc to the west and the Cyprian arc to the east. The Hellenic arc is characterized by a retreating
and normal angle of subduction, whereas the arc appears to involve a shallow angle of subduction with
two major seamounts (the Eratosthenes and Anixamander) impinging on the trench. There is
substantial evidence that the Hellenic arc is retreating and the Cyprian arc is relatively stationary. The
geometric difference between the Cyprian and Hellenic implies that there is a tear or gap in the
subduction of African oceanic lithosphere beneath the Anatolian plate. This tear may be responsible for
the seismically active structural features in the region as well as much of the active deformation within
the Anatolian continental lithosphere, however, the nature and timing of this deformation has not been
determined. In order to address these questions and further understand mantle dynamics and mantle
flow through a possible tear in the subducting lithosphere in IA and the surroundings, 7 temporary
Broadband instruments from University of Missouri-Columbia and 4 broadband instruments from
PASSCAL were deployed in August 2006 in addition to the 23 permanent stations of Bogazici University,
Kandilli Observatory and Earthquake Research Institute (KOERI) and Sleyman Demirel University (SDU)
in the region. Also, KOERI will install 7 new broadband stations by the end of March, 2007. Using the
enhanced detection capability and improved station coverage in the region, we will present some
preliminary results, including the preliminary earthquake locations, seismic velocity structure and crustal
thicknesses from Receiver functions for the selected stations. Through an improved understanding of
this plate boundary, we will be able to further understand the nature of continental uplift, extension,
and mantle dynamics in the region.
Keywords: seismicity, crustalstructure, receiverfunctions