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. The Central Ionian Islands GPS Networks 24 bench marks in Cephalonia 14 bench marks in Zakynthos 4 bench marks in Ithaca

3. Seismic Activity 1964- 2006 (M > 3.6) Seismic Activity 2006–Present (M > 3.6)

4. Lefkas Earthquake August 14, 2003 Mw = 6.3 Zakynthos Seismic Activity March- April 2006

5. Cephalonia Island 24 GPS bench marks

6. DGPS Results 2001 - 20032003 - 2010

7. 2001-2010

8. PSInSAR TM product of Cephalonia Island Processed by Tele-Rilevamento Europa (TRE) ERS descending: ERS descending: 39 images 39 images 4/19/1992 - 2/27/2000 4/19/1992 - 2/27/2000 ENVISAT descending: ENVISAT descending: 21 images 21 images 6/25/2003 - 11/5/2008 6/25/2003 - 11/5/2008

9. Reference Station (No 06) ITRF 2005

10. ERS PS Descending (1992 – 2000) Velocity Field (mm/yr)

11. ENVISAT PS Descending (2003 - 2008) Velocity Field (mm/yr)

12. ERS Velocity Standard Deviation

13. ENVISAT Velocity Standard Deviation

14. V < 0 α < 0 V < 0 α > 0 V > 0 α < 0 V > 0 α > 0 PS Time-Series

15. ERS Acceleration Field V < 0V > 0

16. ENVISAT Acceleration Field V < 0V > 0

17. PS TIME-SERIES

18. Identification of Critical Area based on Observed Seismic Energy Released Star indicates the center of the two circles indicating Low (inside small circle) and High seismic energy release (area between the two circles).

19. Identification of Critical Area based on Modelling of Observed Seismic Accelerating Strain

20. Critical Time Estimation based on Temporal Analysis of Seismicity

21. Critical Time Estimation based on Accelerating Seismicity