NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENSFACULTY OF GEOLOGY & GEOENVIRONMENT

DEPARTMENT OF GEOPHYSICS & GEOTHERMICS

Laboratory of Remote SensingGROUND 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 2006Present(M > 3.6)

Lefkas Earthquake August 14, 2003 Mw = 6.3

Zakynthos Seismic Activity March- April 2006

Cephalonia Island

24 GPS bench marks

DGPS Results2001 - 20032003 - 2010

2001-2010

PSInSARTM product of Cephalonia Island

Processed by Tele-Rilevamento Europa (TRE) ERS descending: 39 images4/19/1992 - 2/27/2000

ENVISAT descending: 21 images6/25/2003 - 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 < 0V < 0 > 0V > 0 < 0V > 0 > 0PS Time-Series

ERS Acceleration Field V < 0V > 0

ENVISAT Acceleration Field V < 0V > 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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