Lidar surveys reveal eruptive volumes and rates at Etna, 2007–2010

The quantification of eruptive activity represents one major challenge in volcanology. Digital
comparison of lidar-based elevation models of Etna (Italy) was made to quantify the volumes of volcanics
emitted in 2007–2010. During this period, Etna produced several summit paroxysms followed by a flank
eruption. We integrated the total volume difference resulting from the subtraction of the 2007 and 2010
digital elevation models with volumes of eruptive products based on field and aerial surveys to attribute
volumes with hitherto unrealized precision to poorly constrained eruptions. The total erupted volume of
2007–2010 is >86 × 106m3, most (~74 × 106m3) of which is made up by the lava flows of the 2008–2009
flank eruption. The survey also reveals the high lava volume (5.73 × 106m3) and average eruption rate
(~400m3 s 1) of the 10 May 2008 paroxysm, whose flow front stopped 6.2km from the vent, not far from the
town of Zafferana Etnea.