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Corinth Gulf Landslides 3HAZ Program WP5 T. Lebourg, S. El Bedoui , A. Deschamps and Y. Guglielmi

Corinth Gulf Landslides 3HAZ Program WP5 T. Lebourg, S. El Bedoui , A. Deschamps and Y. Guglielmi. 3HAZ MEETING, 2-3 DECEMBER 2006 , ATHENS. Participant of CNRS/Geoazur to the landslide project :. Instrumentation. Field studies. Modelling. Geologie, geomorphology

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Corinth Gulf Landslides 3HAZ Program WP5 T. Lebourg, S. El Bedoui , A. Deschamps and Y. Guglielmi

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  1. Corinth Gulf Landslides 3HAZ Program WP5 T. Lebourg, S. El Bedoui , A. Deschamps and Y. Guglielmi 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  2. Participant of CNRS/Geoazur to the landslide project : Instrumentation Field studies Modelling Geologie, geomorphology S. El Bedoui (PhD student) Th. Lebourg (mdc) Hydrogeology Y. Guglielmi (mdc) Cyclique and standard triaxial tests Th. Lebourg (mdc) M. Hernandez (PhD student) FLAC3D-TOUGH simulations Y. Guglielmi (mdc) Tacheometry, topography S. El Bedoui (PhD student) S Lemeunier (engineer) Electrical tomography Th. Lebourg (mdc) Seismological recording on the landslide A. Deschamps (DR) WP5a,c In Process WP5d WP5b WP5a,c WP5f WP5c Leader WP5 : Th. Lebourg (mdc)

  3. Greece Gulf of Corinth Landslides in Corinth Gulf Sergoula and Marathias landslides High relation with tectonics faults Panagopoula landslides 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  4. WP5: Documenting the Panagopoula landslide Limit of the landslide (paleolandslide) C9 C10 Limit of the active part C8 C7 C5 C6 C3 C4 Patras C2 C1 Autoroute Legend: Red : target in active area Yellow : target in intermediary area Green : target in inactive area One photo (1971) and one paper in « engineering geology and environment » Impossibility to have available information on the previous study (…) Lewis Project ??? South North 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  5. WP5.c: Panagopoula data analysis Mechanical behaviour of the material on the sliding surface Standard Triaxial tests Cohesion, angle of friction, elasticity modulus Sliding surface 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  6. WP5.b: Instrumentation of the Panagopoula landslide Topometric network: targets and stations Landslides map 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  7. Topometric survey: 6 months displacement Tectonic signal ? 3mm 18mm 13mm 5mm 12mm 13mm 12mm 16mm 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  8. Results from the one year survey A large scale movement, controlled by structural discontinuities A superficial creep mobilizing the more weathered formations Two components: • « Long term » slide (10-16mm/y) • « Short term » acceleration 2 « different » landslides…

  9. Field study Cross section 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  10. 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  11. Landslides map Landslides activity in deep ??? Electrical tomography 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  12. The geo-electrical tomography: Geological contact Tectonic Faults In deep Failure surface 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  13. Next Landslide body Weathered rock mass Actual Landslide body Drained Faults ? 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  14. Results from the correlation between field and geophysical investigations 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  15. Conclusion on Panagopoula Landslide Tectonic and gravitational correlations • a clear link between E-W tectonic • faults and gravitational scarps, • movements measured is linking with superficial creep of soils,…….. Mud and debris flow • movements between topometric stations could be explain by extensional tectonic activity (Psathopyrgos normal fault) Instrumented area to study the tectonic control of landslide activity 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  16. Accomodation of deep processes at the surface by landsliding?? Large scale movements (GPS) Topometric survey Secteur d’étude de Panagopoula Conglomérats (P. Briolle) (Flotté) 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  17. North coast of Corinth Gulf… Sergoula landslide No human activity • located in the Marathias • fault zone (E-W structures), • near Trisonia Island • (instrumented: GPS, tiltmeters, seismological survey), • Collaboration with Koukouvela I & Gallousi X • (U. Patras). 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  18. Sergoula area South North Trisonia Island E-W normal fault Electrical tomography On the foot of the landslide body and on the debris fan 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  19. 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  20. Normal faulting is closed by river and gravitational deposits Landslides events And tectonic activity controls Sergoula’s sliding… 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  21. 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  22. Datation landslides events with Dendrochronology Calcite and C14 On a fault scarp We hope to realise an instrumentation on and around the landslide with : Permanent geophysical prospecting, tiltmeters, seismological survey. 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  23. An An+1 A1 Rainfall event A2 A3 A4 - Research signal resistivity/fluid by temporal survey

  24. Conclusion • the Panagopoula landsliding is a very little and slow landslide, • field studies and geophysical survey are well correlated to produce a geological model, • electrical tomography gives quantitative and qualitative data about structural boundaries, • a clear link appears between tectonic and gravitational features. 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  25. Perspectives… North and south coast of Corinth gulf are an appropriate area to study the tectonic control of landslides processes Thank you for your attention 3HAZ MEETING, 2-3 DECEMBER 2006, ATHENS

  26. South North

  27. WP5.d: Modelling of slip instability 2D Numerical analysis of « Panagopoula type » landslide Goal : Examining failure mechanisms and their relashionship To South Corinthe gulf coastal slopes characteristics (Martino et al., 2005) • FLAC3D-TOUGH simulations : • Static (seepage effects) • Dynamic (earthquake effects)

  28. Topometric survey: results after 6 months • gravitational movement, • slow movements, • principal movements are • located in the paleo-landslide • body, • general increase of displacement • between april and june. Pluviometry: january to june 2006

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