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