Lagios_et_al_IGARSS_2011.ppt
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Lagios_et_al_IGARSS_2011.ppt Lagios_et_al_IGARSS_2011.ppt Presentation Transcript

  • 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
    • The Central Ionian Islands GPS Networks
    • 24 bench marks in Cephalonia
    • 14 bench marks in Zakynthos
    • 4 bench marks in Ithaca
  • Seismic Activity 1964- 2006 ( M > 3.6 ) Seismic Activity 2006–Present ( M > 3.6 )
    • Lefkas Earthquake
    • August 14, 2003
    • Mw = 6.3
    • Zakynthos Seismic Activity
    • March- April 2006
  • Cephalonia Island
    • 24 GPS bench marks
  • DGPS Results 2001 - 2003 2003 - 2010
  • 2001-2010
  • PSInSAR TM product of Cephalonia Island Processed by Tele-Rilevamento Europa (TRE)
    • ERS descending:
      • 39 images
      • 4/19/1992 - 2/27/2000
    • ENVISAT descending:
      • 21 images
      • 6/25/2003 - 11/5/2008
  • Reference Station (No 06) ITRF 2005
  • ERS PS Descending (1992 – 2000) Velocity Field (mm/yr)
  • ENVISAT PS Descending (2003 - 2008) Velocity Field (mm/yr)
  • ERS Velocity Standard Deviation
  • ENVISAT Velocity Standard Deviation
  • V < 0 α < 0 V < 0 α > 0 V > 0 α < 0 V > 0 α > 0 PS Time-Series
  • ERS Acceleration Field V < 0 V > 0
  • ENVISAT Acceleration Field V < 0 V > 0
  • PS TIME-SERIES
  • 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).
  • Identification of Critical Area based on Modelling of Observed Seismic Accelerating Strain
  • Critical Time Estimation based on Temporal Analysis of Seismicity
  • Critical Time Estimation based on Accelerating Seismicity