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Deep Seismic Structure of the SW Segment of the Hellenic Subduction Zone : the ULYSSE Cruise
Preliminary Results
Details
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Meeting
2013 Fall Meeting
Section
Tectonophysics
Session
Subduction Plate Boundaries From the Trench to Sub-arc and Beyond II Posters
Identifier
T43D-2693
Authors
LAIGLE, M*, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Sachpazi, M, Geodynamic Institute, National Observatory of Athens, Athens, Greece
Vitard, C, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Charvis, P, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Galve, A, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Schenini, L, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Mahamat, A, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Dano, A, GeoAzur, Université Nice Sophia Antipolis, IRD, CNRS, Observatoire de la Côte d’Azur, Valbonne, France
Charalampakis, M, Geodynamic Institute, National Observatory of Athens, Athens, Greece
Pirentis, A T, Geodynamic Institute, National Observatory of Athens, Athens, Greece
Dannowski, A, GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany
Flueh, E R, GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany
HIRN, A, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR CNRS 7154, Paris, France
29/06/2015 11:13
AGU Abstract Browser
http://abstractsearch.agu.org/meetings/2013/FM/T43D-2693.html
Marine seismics [3025]
Subduction zone processes [3060]
Index Terms
Subduction zones [7240]
Subduction zone processes [8170]
Abstract
The Hellenic Subduction zone is characterized by a moderate convergence rate of ~ 4 cm/yr and by the highest rate of current seismicity in Europe. Several
large magnitude (M 7.5 - 8) earthquakes occurred offshore the Peloponnesus peninsula at the turn of the 19th to 20th century. The 400-km-long south-western
segment has been the site of the largest historical earthquake of Europe, the AD 365 M8 earthquake, which occurred offshore South of Peloponnesus and near
SW Crete Island, and which generated a devastating tsunami that spread into the Nile Delta region and along the Adriatic Sea. The megathrust fault and the
outer forearc domain of this SW segment have been the target in November 2012 of the ULYSSE deep penetration seismic experiment on board the N/O Le
Pourquoi Pas? of IFREMER and we present here the preliminary results. We have carried out two 250-km-long refraction OBS transects across the Kythirian
Straits coincident with deep multichannel reflection seismic (MCS) profiles by using a 11 000 cu.inch airgun source of IFREMER and 25 OBH/OBS from
GEOMAR. An additional set of ~650 km of MCS profiles has been collected over the outer forearc domain despite bad weather conditions. Chirp and
multi-beam bathymetric data have also been collected along some of those profiles. These data are now being processed with the objectives of imaging the
megathrust fault in the depth range of 15-40 km and identifying the structural markers of the updip and downdip limits of the potential seismogenic zone (i.e.
the forearc backstop nature and the upper plate Moho up to its intersection with the downgoing plate), as well as their along-strike variations. These results
will furthermore be discussed and analysed together two other datasets that have been collected in the frame of the past EU THALES WAS RIGHT project : a
1-year dataset of local seismicity recorded by a land-OBS network and an onshore 3-D Receiver Functions dataset which provides constraints on the slab
towards greater depths.
Cite as: Author(s) (2013), Title, Abstract T43D-2693 presented at 2013 Fall Meeting, AGU, San Francisco, Calif., 9-13 Dec.
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