Deformation in Hawaii s volcanoes obtained from a ScanSAR-to-StripMap Small BAseline Subset Technique

We investigate the displacement phenomena affecting Mauna Loa and Kilauea volcanoes at Big Island (Hawaii, USA), by applying an advanced ScanSAR-to-stripmap differential Synthetic Aperture Radar Interferometry (InSAR) approach. The implemented method, based on the application of the well-known Small BAseline Subset (SBAS) technique, allows the generation of LOS mean deformation velocity maps and corresponding time series, leading us to characterize the complex deformation of Mauna Loa and Kilauea volcanoes. The presented analysis relies on the use of a SAR dataset composed by 49 ASAR ENVISAT satellite images, relevant to both stripmap and ScanSAR operational modes, acquired on descending orbits (track 200) from January 2003 to September 2008. Moreover, in order to assess the quality of the proposed combined ScanSAR-to-stripmap approach, we perform a comparison between the achieved DInSAR results and the LOS-projected GPS displacement measurements.