Lagios_et_al_IGARSS_2011.ppt

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Lagios_et_al_IGARSS_2011.ppt

  1. 1. NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS FACULTY OF GEOLOGY & GEOENVIRONMENT DEPARTMENT OF GEOPHYSICS & GEOTHERMICS Laboratory of Remote Sensing GROUND DEFORMATION STUDIES IN CEPHALONIA ISLAND (WESTERN GREECE) BASED ON DGPS & PS INTERFEROMETRY Evangelos Lagios, Vassilis Sakkas, Fabrizio Novali, Alfio Fumagalli & Sara Del Conte
  2. 2. <ul><li>The Central Ionian Islands GPS Networks </li></ul><ul><li>24 bench marks in Cephalonia </li></ul><ul><li>14 bench marks in Zakynthos </li></ul><ul><li>4 bench marks in Ithaca </li></ul>
  3. 3. Seismic Activity 1964- 2006 ( M > 3.6 ) Seismic Activity 2006–Present ( M > 3.6 )
  4. 4. <ul><li>Lefkas Earthquake </li></ul><ul><li>August 14, 2003 </li></ul><ul><li>Mw = 6.3 </li></ul><ul><li>Zakynthos Seismic Activity </li></ul><ul><li>March- April 2006 </li></ul>
  5. 5. Cephalonia Island <ul><li>24 GPS bench marks </li></ul>
  6. 6. DGPS Results 2001 - 2003 2003 - 2010
  7. 7. 2001-2010
  8. 8. PSInSAR TM product of Cephalonia Island Processed by Tele-Rilevamento Europa (TRE) <ul><li>ERS descending: </li></ul><ul><ul><li>39 images </li></ul></ul><ul><ul><li>4/19/1992 - 2/27/2000 </li></ul></ul><ul><li>ENVISAT descending: </li></ul><ul><ul><li>21 images </li></ul></ul><ul><ul><li>6/25/2003 - 11/5/2008 </li></ul></ul>
  9. 9. Reference Station (No 06) ITRF 2005
  10. 10. ERS PS Descending (1992 – 2000) Velocity Field (mm/yr)
  11. 11. ENVISAT PS Descending (2003 - 2008) Velocity Field (mm/yr)
  12. 12. ERS Velocity Standard Deviation
  13. 13. ENVISAT Velocity Standard Deviation
  14. 14. V < 0 α < 0 V < 0 α > 0 V > 0 α < 0 V > 0 α > 0 PS Time-Series
  15. 15. ERS Acceleration Field V < 0 V > 0
  16. 16. ENVISAT Acceleration Field V < 0 V > 0
  17. 17. PS TIME-SERIES
  18. 18. Identification of Critical Area based on Observed Seismic Energy Released Star indicates the center of the two circles indicating L ow (inside small circle) and High seismic energy release (area between the two circles).
  19. 19. Identification of Critical Area based on Modelling of Observed Seismic Accelerating Strain
  20. 20. Critical Time Estimation based on Temporal Analysis of Seismicity
  21. 21. Critical Time Estimation based on Accelerating Seismicity

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