eprintid: 1495 rev_number: 14 eprint_status: archive userid: 2 dir: disk0/00/00/14/95 datestamp: 2015-02-10 12:18:51 lastmod: 2017-02-08 12:21:32 status_changed: 2015-04-27 12:11:00 type: article metadata_visibility: show creators_name: Briole, Pierre creators_name: Rigo, Alexis creators_name: Lyon-Caen, Helene creators_name: Ruegg, Jean-Claude creators_name: Papazissi, Kalliopi creators_name: Mitsakaki, Christiana creators_name: Balodimou, Amalia creators_name: Veis, George creators_name: Hatzfeld, Denis creators_name: Deschamps, Anne creators_id: pierre.briole@ens.fr creators_id: alexis.rigo@cnes.fr creators_id: helene.lyon-caen@ens.fr creators_id: ruegg@ipgp.jussieu.fr creators_id: creators_id: topocris@central.ntua.gr creators_id: creators_id: creators_id: Denis.Hatzfeld@obs.ujf-grenoble.fr creators_id: Anne.Deschamps@univ-brest.fr corp_creators: Deparement de Sismologie, UMR-CNRS 7580, Institut de Physique du Globe, Paris, France corp_creators: Groupe de Recherche en Geodesie Spatiale, Observatoire Midi Pyrenees, Toulouse, France corp_creators: Laboratoire de Geologie, Ecole Normale Superieure, Paris, France corp_creators: Deparement de Sismologie, UMR-CNRS 7580, Institut de Physique du Globe, Paris, France corp_creators: Higher Geodesy Laboratory, National Technical University, Athens, Greece corp_creators: Higher Geodesy Laboratory, National Technical University, Athens, Greece corp_creators: Higher Geodesy Laboratory, National Technical University, Athens, Greece corp_creators: Higher Geodesy Laboratory, National Technical University, Athens, Greece corp_creators: Laboratoire de Geophysique Interne et Tectonophysique, Observatiore de Grenoble, Grenoble, France corp_creators: Laboratiore de Geodynamique, CNRS Sophia-Antipolis, Valbonne, France title: Active deformation of the Corinth rift, Greece: Results from repeated Global Positioning System surveys between 1990 and 1995 ispublished: pub subjects: SS divisions: EPOS-P full_text_status: none abstract: Between 1990 and 1995, we carried out seven Global Positioning System (GPS) campaigns in the Corinth rift area in order to constrain the spatial and temporal crustal deformation of this active zone. The network, 193 points over ∼10,000 km2, samples most of the active faults. In order to estimate the deformation over a longer period, 159 of those points are also Greek triangulation pillars previously measured between 1966 and 1972. Two earthquakes of magnitude 6.2 and 5.9 have occurred in the network since it was installed. The extension rate deduced from the analysis of the different GPS data sets is 14±2 mm/yr oriented N9° in the west, 13±3 mm/yr oriented S-N in the center, and 10±4 mm/yr oriented N19°W in the east of the gulf. The comparison between GPS and triangulation gives higher rates and less angular divergence (25±7 mm/yr, N4°E; 22±7 mm/yr, S-N; 20±7 mm/yr, N15°W, respectively). Both sets of data indicate that the deforming zone is very narrow (10–15 km) in the west, might be wider in the center (15–20 km), and is more diffuse in the east. The analysis of the displacements observed after the Ms = 6.2, June 15, 1995, and the Ms = S.9, November 18, 1992, earthquakes, both located in the west of the gulf, together with seismological and tectonic observations shows that these two earthquakes occurred on low-angle (≤35°) north dipping normal faults located between 4.5 and 10 km depth in the inner part of the rift. Assuming that the deformation is concentrated in relatively narrow deforming zones, we use a simple model of a dislocation in an elastic half-space to study the implication of the localization. Using the geometry of the known seismogenic faults, our observations imply continuous aseismic deformation in the uppermost crust of the inner rift. This model predicts geodetic strain rates close to seismic strain rates in opposition to previous estimates. This is because our model takes into account the activity on low-angle normal faults in the inner rift and an effective seismogenic layer of 6–7 km, about half that usually assumed. date: 2000-11-10 date_type: published publication: Journal of Geophysical Research volume: 105 number: B11 publisher: American Geophysical Union pagerange: 25605-25625 id_number: doi:10.1029/2000JB900148 refereed: TRUE issn: 0148-0227 official_url: http://dx.doi.org/10.1029/2000JB900148 access_IS-EPOS: limited owner: Publisher citation: Briole, Pierre and Rigo, Alexis and Lyon-Caen, Helene and Ruegg, Jean-Claude and Papazissi, Kalliopi and Mitsakaki, Christiana and Balodimou, Amalia and Veis, George and Hatzfeld, Denis and Deschamps, Anne (2000) Active deformation of the Corinth rift, Greece: Results from repeated Global Positioning System surveys between 1990 and 1995. Journal of Geophysical Research, 105 (B11). pp. 25605-25625. DOI: https://doi.org/10.1029/2000JB900148