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Since 2003, 27 independent look angles have been acquired by ENVISAT's Advanced Synthetic Aperture Radar (ASAR) instrument over the island of Hawai'i, allowing for the formation of thousands of interferograms showing deformation of the ground surface. On Ki??lauea volcano, a transition from minor to broad-scale summit inflation was observed by interferograms that span 2003 to 2006. In addition, radar interferometry (InSAR) observations of Ki??lauea led to the discovery of several previously unknown areas of localized subsidence in the caldera and along the volcano's east rift zone. These features are probably caused by the cooling and contraction of accumulated lavas. After November 2005, a surface instability near the point that lava entered the ocean on the south flank of Ki??lauea was observed in interferograms. The motion is most likely a result of unbuttressing of a portion of the coast following the collapse of a large lava delta in November 2005. InSAR data can also be used to map lava flow development over time, providing ???30 m spatial resolution maps at approximately monthly intervals. Future applications of InSAR to Ki??lauea will probably result in more discoveries and insights, both as the style of volcano deformation changes and as data from new instruments are acquired.
Additional Publication Details
ASAR images a diverse set of deformation patterns at Ki??lauea volcano, Hawai'i