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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 2321 Litosphere-astenosphere system beneath The Carpathian Bending Zone by seismic attenuation and satellite geodesy Dr. Victor Mocanu Geophysics University of Bucharest Ray Russo, Boudewijn Ambrosius The origin of the unusual high seismic activity beneath the Carpathian Bending Zone is a long-term debate and keeps the geoscientific efforts at high level in this area. The processes involved are complex and their nature could be eventually associated with several hypothesis: (1) subduction of an oceanic lithosphere (and eventually a remnant of this being just now detaching from the continental lithosphere of the East European Platform and Moesian Platforms), (2) the oceanic slab subduction ended sometimes in late Miocene and then a part of the continental lithosphere of the mentioned platforms has been delaminated. Various models of the lithosphere astenosphere system take into account for example the seismic attenuation and share wave splitting. Different geometry of the lithosphere astenosphere system as well as the mantle flow around the slabs generate intriguing questions. We consider another constraint to the various methodological approaches by taking into account the kinematics of the crustal blocks as suggested by robust outcomes of the satellite geodesy. We will integrate results of seismic attenuation, mantle anisotropy and GPS in order to test the deep feedback to the Tethyan closure, including the astenosphere lithosphere system, trying to explain the very unusual high Carpathian seismicity. Keywords: earthquakes, attenuation, gps
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 2322 Crustal structure of the Abruzzo Apennines (Central Italy) through the analysis of seismic data registered by a local network Dr. Samer Bagh Centro Nazionale Terremoti Istituto Nazionale di Geofisica e Vulcanologia Claudio Chiarabba, Pasquale De Gori, Nicola Piana Agostinetti In this study the background seismic activity and crustal structure of the Abruzzo Apennines (Central Italy) were investigated by analyzing and processing about 850 local earthquakes and 30 teleseisms, recorded from April 2003 to September 2004 by a dense temporary seismic network, composed of 30 digital three-component stations. Velocity models computed by local earthquake tomography and receiver function analysis were used to investigate the crustal structure of the study region. The computed 3-D tomographic model shows two clear, high Vp features. The shape of the shallower one (down to 9-10 km depth), resembles in cross section thrust-sheets with E to NE vergence, in good agreement with the imbricates of the regional thrust systems of the Abruzzo Apennines. The geometry of this high-Vp anomaly suggests multiple detachment levels, implying a thin-skinned component in the Mio-Pliocene orogenic building of the region. The deeper high Vp feature, visible between 9 and 15 km depth (i.e., the lowermost limit of the Vp model resolution), has higher velocities (> 7 km/s). This relatively thick high Vp feature may represent thick Triassic successions (evaporites and dolomites) deposited in the hanging-wall of pre-orogenic extensional faults. This suggests a tectonic inversion component in the compressive tectonics, which may indicate an involvement of, at least, the basementtop formation in the compressive tectonics. S-wave velocity model obtained by the receiver function analysis provides valuable information on the basement depth. A low velocity layer (Vs = 2.8 km/s, Vp = 5.0 km/s) is imaged at about 15 km depth. This layer is interpreted as Permo-Triassic clastic successions overlying the crystalline metamorphic basement. Based on the obtained velocity structure and other available geophysical data, a structural model including elements of both thin and thickskinned tectonics is suggested for this sector of the Apennines. Keywords: local earthquake tomography, receiver function, crustal structure
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS014 Poster presentation 2321<br />
Litosphere-astenosphere system beneath The Carpathian Bending Zone by<br />
seismic attenuation and satellite geodesy<br />
Dr. Victor Mocanu<br />
Geophysics University of Bucharest<br />
Ray Russo, Boudewijn Ambrosius<br />
The origin of the unusual high seismic activity beneath the Carpathian Bending Zone is a long-term<br />
debate and keeps the geoscientific efforts at high level in this area. The processes involved are complex<br />
and their nature could be eventually associated with several hypothesis: (1) subduction of an oceanic<br />
lithosphere (and eventually a remnant of this being just now detaching from the continental lithosphere<br />
of the East European Platform and Moesian Platforms), (2) the oceanic slab subduction ended<br />
sometimes in late Miocene and then a part of the continental lithosphere of the mentioned platforms<br />
has been delaminated. Various models of the lithosphere astenosphere system take into account for<br />
example the seismic attenuation and share wave splitting. Different geometry of the lithosphere<br />
astenosphere system as well as the mantle flow around the slabs generate intriguing questions. We<br />
consider another constraint to the various methodological approaches by taking into account the<br />
kinematics of the crustal blocks as suggested by robust outcomes of the satellite geodesy. We will<br />
integrate results of seismic attenuation, mantle anisotropy and GPS in order to test the deep feedback<br />
to the Tethyan closure, including the astenosphere lithosphere system, trying to explain the very<br />
unusual high Carpathian seismicity.<br />
Keywords: earthquakes, attenuation, gps
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