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    Sakkas.ppt Sakkas.ppt Presentation Transcript

    • 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
      • 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
    • Geodynamic Settings Seismotectonic map of Greece
    • Main Geological Units
    • Seismic Activity 1980 - 2011 M>3.6 Mw=6.4 Mw=6.4 Mw=5.6 Mw=5.4 CTF Patras Gulf
      • The Patras Gulf GPS Network
      • 10 Bench marks
      • 1 Continuous GPS station (RLSO) – Established 2006
      • Campaigns
      • 1994
      • 1996
      • 2006
      • 2011
    • Rio – Antirrio Bridge GPS network
      • 7 Bench Marks
      • 2008, 2009, 2011
    • DGPS Results 1994 – 2006 (ITRF 2000) Vertical Displacement
    • DGPS Results 1994 – 2006 Reference : No 50 Vertical Displacement 50
    • Strain Rate Field Blue arrows: Extension Red arrows: Compression
    • Rio – Antirrio Bridge GPS net
    • 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
    • (Mw=6.4, June 8 th 2008) Andravida Earthquake
    • Mw=6.4 Time Series of RLSO station 2006 – present (ITRF 2000) Mw=6.4
    • 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
      • “ 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 !