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This paper presents latest results from the com- bined use of SAR (Synthetic Aperture Radar) remote sens- ing and GIS providing detailed insights into recent volcanic activity under Vatnajökull ice cap (Iceland). Glaciers atop active volcanoes pose a constant potential danger to adja- cent inhabited regions and infrastructure. Besides the usual volcanic hazards (lava flows, pyroclastic clouds, tephra falls, etc.), the volcano-ice interaction leads to enormous meltwa- ter torrents (icelandic: jökulhlaup), devastating large areas in the surroundings of the affected glacier. The presented mon- itoring strategy addresses the three crucial questions: When will an eruption occur, where is the eruption site and which area is endangered by the accompanying jökulhlaup. There- fore, sufficient early-warning and hazard zonation for future subglacial volcanic eruptions becomes possible, as demon- strated for the Bardárbunga volcano under the northern parts of Vatnajökull. Seismic activity revealed unrest at the north- ern flanks of Bardárbunga caldera at the end of September 2006. The exact location of the corresponding active vent and therefore a potentially eruptive area could be detected by continuous ENVISAT-ASAR monitoring. With this knowl- edge a precise prediction of peri-glacial regions prone to a devastating outburst flood accompanying a possible future eruption is possible.

Combination of SAR remote sensing and GIS for monitoring subglacial volcanic activity – recent results from Vatnajökull ice cap (Iceland)