Study of the present-day tectonics and seismogenetic sources of the Al-Hoceima region (Morocco) using GPS and MTInSAR.

Abstract

Geodetic analysis and modelling of ground deformation data is a valuable tool that allows constraining present-day tectonics deformation styles and its implications on the related seismic hazards. We re-analyzed the survey GPS data available from the Nubian and Iberian (Eurasian) plate boundary to develop surface strain maps. We also study a high non-linear deformation time series using a multitemporal interferometry synthetic aperture radar (SAR) technique, such as those spanning coseismic signals. That analysis has been challenging due to the problem of intrinsic temporal smoothing of such multibaseline techniques. We used StaMPS/MTI version with the minimum possible temporal smoothing and we retrieve time series of deformation spanning the coseismic signal due to the 24 February 2004, Mw 6.3, Al-Hoceima (Rif, Morocco). Applying a temporal smoothing (atmospheric filtering) to the pre- and postseismic subsets of the time series we obtained a filtered time series that show a persistent signal during the postseismic period.