1. Analysis of the Ms=6.2, June 15, 1995 Aigion earthquake(Greece) :
National Technical University of Athens Higher Geodesy Laboratory Dionysos Satellite Observatory
Analysis of the Ms=6.2, June 15, 1995 Aigion earthquake(Greece) :
Data,products and preliminary results
S. Alatza, P. Elias, P. Briole, D. Paradissis
CRL School 2017, September
CRL 1

2. 1. Study motivation/objectives
Study area of great tectonic interest
Re-analysis of the Ms=6.2, June 15, Aigion earthquake
New approach with SNAP
Comparison with previous studies(Bernard et al.,1997)
Evaluation of SNAP benefits

3. 2. Tectonic framework 2.1 Major earthquakes 1965-1995
Courtesy of [ Armijo et al. (1996) and major earthquakes since 1965 (1965, 1970: Baker et al., (1997); 1981, 1984: Taymaz (1990); 1992: location from the present study,mechanism from Hatzfeld et al. (1996); 1995 earthquake: Bernard et al.,(1997).]

4. 2.2 The 1995 Aigion earthquake Ms=6.2 26 casualties
Severe damages in Aigion city (2000 buildings)
Courtesy of [ Bernard et al.,(1997).] Aftershocks of the 1995 Aigion earthquake.

5. 3.Data ERS level 1 images from the ESA Ascending track 415
Descending track 279
SRTM3-DEM

8. 4.Processing with SNAP

9. 4.1 Ιnterferometric pairs selection
Descending Track
Ascending Track

10. 4.2 Overview of ERS sensor C band 35m spatial resolution
23o look angle
100km swath
35 day repeat

11. Different Coarse Window Width and Height in coarse coregistration64
128 32
1024

12. 4.4 Coherence estimation Different ratio in range-azimuth window size
1-5
2-10
4-20

13. 4.5 Coherence statistics
3600 vs GCP

14. 10000 GCP GCP

15. 5.Results

21. m
sdgdfgfghdhg

22. 6.Comparison with previous study
April 29,1995-July 8,1995
Altitude ambiguity 130m
Ten visible fringes around Psaromyta cape
Courtesy of [ Bernard et al.,(1997).]

23. 6.Conclusions-Future work
Slight difference between interferograms of ascending and descending track
Nine visible fringes around Psaromyta cape with each fringe corresponding to 28mm of ground deformation in the line of sight
SNAP proved to be a high accuracy free software, compared with commercial software used in the past for the same seismic event

24. Combination of both tracks for the earthquake analysis
Modelling of the earthquake using an inversion method
Generation of all available co-seismic interferogarms to create an average stack
Similar investigation was performed for Envisat images

25. Thank you!