Sakkas.ppt

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Sakkas.ppt

  1. 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. 2. <ul><li>Aims of the Study </li></ul><ul><li>Study the Regional and Local Ground Deformation </li></ul><ul><li>Integrate DGPS & Seismological data to identify ground motion due to seismic activity and active tectonism </li></ul><ul><li>Model major fault movements </li></ul>Peloponnesus
  3. 3. Geodynamic Settings Seismotectonic map of Greece
  4. 4. Main Geological Units
  5. 5. Seismic Activity 1980 - 2011 M>3.6 Mw=6.4 Mw=6.4 Mw=5.6 Mw=5.4 CTF Patras Gulf
  6. 6. <ul><li>The Patras Gulf GPS Network </li></ul><ul><li>10 Bench marks </li></ul><ul><li>1 Continuous GPS station (RLSO) – Established 2006 </li></ul><ul><li>Campaigns </li></ul><ul><li>1994 </li></ul><ul><li>1996 </li></ul><ul><li>2006 </li></ul><ul><li>2011 </li></ul>
  7. 7. Rio – Antirrio Bridge GPS network <ul><li>7 Bench Marks </li></ul><ul><li>2008, 2009, 2011 </li></ul>
  8. 8. DGPS Results 1994 – 2006 (ITRF 2000) Vertical Displacement
  9. 9. DGPS Results 1994 – 2006 Reference : No 50 Vertical Displacement 50
  10. 10. Strain Rate Field Blue arrows: Extension Red arrows: Compression
  11. 11. Rio – Antirrio Bridge GPS net
  12. 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. 13. (Mw=6.4, June 8 th 2008) Andravida Earthquake
  14. 14. Mw=6.4 Time Series of RLSO station 2006 – present (ITRF 2000) Mw=6.4
  15. 15. Conclusions <ul><li>Opening up of the Patras Gulf at a rate of 8 – 13 mm/yr </li></ul><ul><li>Uplift of the southern Part of ≈ 5 mm/yr </li></ul><ul><li>Westward increasing extension of the Patras Gulf </li></ul><ul><li>Smaller extension in the Rio – Antirrio Area ≈ 7 mm/yr </li></ul><ul><li>RLSO CGPS station revealed SE horizontal motion with respect to ITRF2000 </li></ul><ul><li>The 2008 Andravida Earthquake (Mw=6.4) was clearly depicted in RLSO CGPS station, with a northward offset of about 10 mm </li></ul>
  16. 16. <ul><li>“ Google Earth” used to produce some of the Maps </li></ul><ul><li>“ Generic Mapping Tool” (GMT ) was used for all the figures </li></ul><ul><li>“ Grid_Strain” s/w of “Pesci A., Teza G., 2007” used for the strain calculation </li></ul>Acknowledgements Thank you for your Attention !

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