HR: 0800h
AN: T51B-0558    [Abstracts]
TI: Imaging the Southern Hellenic Subduction Zone Through Migration of Scattered Teleseismic Body Waves
AU: * Suckale, J
EM: suckale@mit.edu
AF: Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, United States
AU: Rondenay, S
EM: rondenay@mit.edu
AF: Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, United States
AU: Sachpazi, M
EM: m.sachp@gein.noa.gr
AF: Geodynamic Institute, National Observatory of Athens, Athens, 11810, Greece
AU: Charalampakis, M
EM: cmarinos@gein.noa.gr
AF: Geodynamic Institute, National Observatory of Athens, Athens, 11810, Greece
AU: Hosa, A
EM: olahosa@mit.edu
AF: Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, United States
AU: Royden, L
EM: lhroyden@mit.edu
AF: Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, United States
AB: The active Hellenic subduction system located in the east-central Mediterranean region offers an excellent opportunity to study the dynamic interaction between subducting lithosphere and the surrounding mantle. An interdisciplinary effort to study these complex processes is currently undertaken by the MEDUSA ("Multi-disciplinary Experiments for Dynamic Understanding of Subduction under the Aegean Sea") project. As part of this initiative a dense array consisting of 40 broadband seismometers from the IRIS-PASSCAL pool has been deployed in southern Greece. The design of the array is optimized to both provide high-resolution for teleseismic migration techniques and be versatile towards application of other imaging techniques. This is achieved by a fan-shaped setup with an almost linear station- spacing in the regions where the slab is still shallow and a continuous broadening of the array as the slab descends deeper into the mantle. At this stage, the data have been used for receiver function analysis and migration of teleseismic scattered waves to obtain a two-dimensional image of the subduction zone. Preliminary results indicate the presence of two robust features: (1) a sharp Moho of variable thickness with an apparent thinning occurring at the eastern and western margin of the study area, and (2) a clearly defined subducted crust of the Hellenic slab, which plunges at an angle of 25° and exhibits low-velocities (relative to the surrounding mantle) to depths of at least 100 km.
DE: 7203 Body waves
DE: 7208 Mantle (1212, 1213, 8124)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting