Afar – InSAR FLATSIM : Ground Deformation products

This dataset provides high-precision measurements of surface displacements for the AFAR area. The data is generated using the FLATSIM processing chain, designed for consistent ans systematic INSAR analysis at large scale.

This project aims to characterize the spatial and temporal distribution of the deformation in the region of the Afar depression. The aim is to better understand large-scale tectonics (localization of divergent borders, kinematics of the triple point), but also the dynamics of volcanic, seismic and aseismic events, and the mechanics of active faults. The issue of gravity hazard will also be addressed.

Three types of products are made available for each orbit portion processed (see detailed description )

• « INTERFEROGRAM »: this brings together the differential interferograms, wound and unwound, in radar or terrain geometry, filtered or not, at different resolutions, as well as the atmospheric correction maps used and spatial coherence for each interferogram.
• « TIMESERIES »: this includes maps of movement in time series and average speed, according to the satellite line of sight (LOS), and quality indices of time series processing.
• « AUXILIARYDATA »: this directory contains maps indicating the LOS vector, the DTM in radar geometry, at different resolutions, the radar-field geometry transcoding tables, and temporal coherence, as well as a set of figures and parameter files specific to the processing of the time series.

These products feature the data cube of cumulative deformation for each time-step of the series, along with the estimated mean velocity in the radar Line-of-Sight (LOS), provided in either radar or ground geometry. Each interferogram is delivered with an atmospheric phase mask, unfiltered wrapped and unwrapped interferograms, wrapped differential interferograms, and spatial coherence maps. This dataset also provides additional information such as processing parameters, radar-to-ground geometry look-up tables, and traces recorded during the processing.

Plus d’informations

https://formater.pages.in2p3.fr/flatsim/pres_flatsim.html#the-interferogram-packages