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NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENSFACULTY 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
PSInSARTM product of Cephalonia Island
Processed by Tele-Rilevamento Europa (TRE)
ERS descending: ERS descending: 39 images39 images 4/19/1992 - 2/27/20004/19/1992 - 2/27/2000
ENVISAT descending: ENVISAT descending: 21 images21 images 6/25/2003 - 11/5/20086/25/2003 - 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 < 0α < 0
V < 0α > 0
V > 0α < 0 V > 0
α > 0
PS Time-Series
ERS Acceleration Field
0 0
V < 0 V > 0
ENVISAT Acceleration Field
0 0
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 Low (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
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