HR: 10:20h
AN: T32A-01    [Abstracts]
TI: Mantle \emph{S}-velocity structure of the Mediterranean region using joint tomography of surface and \emph{S}-body waves
AU: * Schmid, C
EM: cschmid@tomo.ig.erdw.ethz.ch
AF: Inst. of Geophysics ETH-Zurich, Honggerberg/HPP, Zurich, 8093 Switzerland
AU: van der Lee, S
AF: Department of Geological Sciences Northwestern University, 1850 Campus Drive, Evanston, IL 60208-2150 United States
AU: Giardini, D
AF: Inst. of Geophysics ETH-Zurich, Honggerberg/HPP, Zurich, 8093 Switzerland
AB: We present a new 3-D \emph{S}-velocity model for the upper mantle beneath the Mediterranean region. This new model is based on a joint inversion of surface waveform fits and body-wave arrival time data. We use the waveform fits of Marone et al. (2003), cross correlation-derived relative delay times from teleseismic events recorded by MIDSEA and other seismic stations, and absolute delays from the reprocessed ISC-catalog (Engdahl et al.,1998). We further include all available results from receiver function and reflection/refraction studies to have independent constraints on the depth of the Moho. It is shown that surface wave data and body wave data can be combined to derive a better constrained model of velocity perturbations than is possible by inversion of just a single dataset alone. The model is consistent with both data sets to within four standard deviations. The teleseismic data increase lateral resolution in station-pupolated regions, add resolving power for the uppermost lower mantle, and increase it for the transition zone, resulting in sharper high-velocity features compared to the model derived from regional S and surface wave trains only (Marone et al., 2004). The new model shows high velocities related to past and present subduction beneath the Hellenic trench and southern Italy. High velocities at transition zone depths are observed beneath Greece and Eastern Spain, most likely related to past subduction. The Tyrrhenian Sea shows a high-velocity anomaly at the very bottom of the transition zone.
DE: 8180 Tomography
DE: 8120 Dynamics of lithosphere and mantle--general
DE: 7218 Lithosphere and upper mantle
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting