1. Investigating the seismic cycle in Italy by multitemporal analysis of ALOS, COSMO-SkyMed and ERS/Envisat DInSAR data sets C.Tolomei , S. Atzori, J. P.Merryman, G. Pezzo, S. Salvi (1) (1) Istituto Nazionale di Geofisica e Vulcanologia - Rome, italy

4. What we produce Ground velocity maps at the fault scale The SIGRIS PR1 products are maps showing the small (mm/yr) progressive movements of the Earth’s surface occurred over a period of years. We use them to quantify the crustal deformation associated to the seismic cycle , in particular in the inter-seismic and post-seismic phases. The amount and patterns of crustal deformation are related to the tectonic stress accumulated and then released during the earthquakes .

7. SIGRIS Test Sites The SIGRIS Project considers 4 test areas in Italy. We processed over 1100 SAR images from ERS, ENVISAT, ALOS, and COSMO-SkyMed satellites. We generated, validated, and delivered to the Italian Civil Protection over 100 PR1 product items.

8. The Straits of Messina The largest earthquake of the XX century in Italy Mw = 7.1, in 1908 Debated earthquake source (at least 5 different fault models) To be crossed by a 4-km long suspended bridge From Amoruso et al, 2002, JGR Inter-seismic phase

9. Ground deformation using time-series DInSAR SAR Data: ERS (1992-2001) 71 images (D), 37 (A) ENVISAT (2003-2008) 34 images (A) ALOS (2007-2010) 22 images (A) COSMO-Skymed (2009-2010) 17 images (D)

10. Mean Ground Velocity Maps (LoS) Ascending Orbit Descending orbit ERS+ENVISAT

11. Time Series examples

13. Up Component Legend Up Velocity (mm/yr) _ +

14. East Component 4 mm/yr 0 mm/yr -5 mm/yr -1 mm/yr -4 mm/yr -9 mm/yr Legend East Velocity (mm/yr)

15. Temporal span: 10/01/07- 05/06/10 22 images ALOS Mean Ground Velocity Map (LoS) Processed with SARscape

16. What ALOS can detect 2 1 2007-2010 1992-2010 1 N S S W E 2

17. COSMO-SkyMed Ground Velocity map (LoS) Ascending orbit 1 2 Area 1 1st of October, 2009: Mud landslide, 30 casualties 1 1 2 2

18. The April 6, 2009 L’Aquila earthquake Co-seismic & post-seismic phase

19. Co-seismic deformation maps: first clear SAR interferogram (ENVISAT desc) -27 cm LoS displacement

20. Co-seismic deformation maps: second clear SAR interferogram (COSMO asc) -25 cm LoS displacement

21. Co-seismic deformation maps: vertical ground displacement

22. Co-seismic deformation maps: East ground displacement

24. Descending Pass Ascending Pass 26/02/2003- 14/07/2010 02/09/2003- 22/06/2010 ASAR Mean Velocity Map (LoS) earthquake

25. ALOS Mean Velocity Map (LoS) Track 639 Frame 830 Temporal span: 15/01/2007-26/07/2010 Processed with SARscape 16 images

26. Temporal span: 29/04/2009-13/10/2009 23 slc used Ascending Orbit COSMO-SkyMed Mean Ground Velocity Map (LoS) Processed with SARscape earthquake earthquake

27. COSMO-SkyMed Displacement Map (LoS)

29. Thank you for your attention!