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Sakkas.ppt Presentation Transcript

  • 1. NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS FACULTY OF GEOLOGY & GEOENVIRONMENT DEPARTMENT OF GEOPHYSICS & GEOTHERMICS Laboratory of Remote Sensing CRUSTAL DEFORMATION STUDIES IN THE SEISMICALLY ACTIVE AREA OF PATRAS GULF (GREECE) Konstantina Vlachou, Vassilis Sakkas, Panagiotis Papadimitriou & Evangelos Lagios
  • 2.
    • Aims of the Study
    • Study the Regional and Local Ground Deformation
    • Integrate DGPS & Seismological data to identify ground motion due to seismic activity and active tectonism
    • Model major fault movements
    Peloponnesus
  • 3. Geodynamic Settings Seismotectonic map of Greece
  • 4. Main Geological Units
  • 5. Seismic Activity 1980 - 2011 M>3.6 Mw=6.4 Mw=6.4 Mw=5.6 Mw=5.4 CTF Patras Gulf
  • 6.
    • The Patras Gulf GPS Network
    • 10 Bench marks
    • 1 Continuous GPS station (RLSO) – Established 2006
    • Campaigns
    • 1994
    • 1996
    • 2006
    • 2011
  • 7. Rio – Antirrio Bridge GPS network
    • 7 Bench Marks
    • 2008, 2009, 2011
  • 8. DGPS Results 1994 – 2006 (ITRF 2000) Vertical Displacement
  • 9. DGPS Results 1994 – 2006 Reference : No 50 Vertical Displacement 50
  • 10. Strain Rate Field Blue arrows: Extension Red arrows: Compression
  • 11. Rio – Antirrio Bridge GPS net
  • 12. Continuous GPS station RLSO Station Velocit y ( ETRF )    Epoch 2005.00 CGPS Station V East  (m m /yr) V North  (m m /yr) V Up  (m m /yr) RLSO -17.4 -15.2 +6.0 UoA1 -16.2 -22.4 +1.1 VLSM -6.4 -7.9 +0.5
  • 13. (Mw=6.4, June 8 th 2008) Andravida Earthquake
  • 14. Mw=6.4 Time Series of RLSO station 2006 – present (ITRF 2000) Mw=6.4
  • 15. Conclusions
    • Opening up of the Patras Gulf at a rate of 8 – 13 mm/yr
    • Uplift of the southern Part of ≈ 5 mm/yr
    • Westward increasing extension of the Patras Gulf
    • Smaller extension in the Rio – Antirrio Area ≈ 7 mm/yr
    • RLSO CGPS station revealed SE horizontal motion with respect to ITRF2000
    • The 2008 Andravida Earthquake (Mw=6.4) was clearly depicted in RLSO CGPS station, with a northward offset of about 10 mm
  • 16.
    • “ Google Earth” used to produce some of the Maps
    • “ Generic Mapping Tool” (GMT ) was used for all the figures
    • “ Grid_Strain” s/w of “Pesci A., Teza G., 2007” used for the strain calculation
    Acknowledgements Thank you for your Attention !