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TitleX- and C-Band SAR surface displacement for the 2013 Lunigiana earthquake (Northern Italy): a breached relay ramp?
AuthorStramondo, S; Vannoli, P; Cannelli, V; Polcari, M; Melini, D; Samsonov, SORCID logo; Moro, M; Bignami, C; Saroli, M
SourceIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing vol. 7, issue 7, 2014 p. 2746-2753, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20150208
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Mediapaper; digital; on-line
File formatpdf
AreaLunigiana; Northern Italy; Italy
Lat/Long WENS 9.0000 13.5000 44.5000 43.3833
Subjectsgeophysics; structural geology; displacement; remote sensing; earthquakes; earthquake studies; earthquake mechanisms; faulting; faults; faults, normal; structural analyses; structural interpretations; RADARSAT-2; COSMO-SkyMed; Lunigiana Basin; Garfagnana Basin; Okada analytical formulation
Illustrationslocation maps; plots; satellite images; geophysical images; tables; block diagrams
Released2014 07 01
AbstractIn this paper, we applied the differential interferometric synthetic aperture radar (DInSAR) technique to investigate and measure surface displacements due to the 5.3 ( 5.2), June 21, 2013 earthquake, occurred north of the Apuan Alps (NW Italy), in the discontinuity zone between the Lunigiana and Garfagnana area. Two differential interferograms showing the coseismic displacement have been generated using X-band and C-band data, taken from COSMO-SkyMed and RADARSAT-2 satellites, respectively. Both interferograms highlighted a clear pattern of subsidence of few cm located between the Lunigiana and Garfagnana basins. We then modeled the observed SAR deformation fields using the Okada analytical formulation and found them to be consistent with an extensional fault plane dipping toward NW at about 50 . The integrated analysis of DInSAR, geological data, modeling, and historical seismicity suggest that the fault responsible for the June 2013 earthquake corresponds to a breached relay ramp connecting the Lunigiana and Garfagnana seismogenic sources.

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