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Paper No. 5
Presentation Time: 9:05 AM


MONECKE, Thomas1, PETERSEN, Sven2, HANNINGTON, Mark3, ANZIDEI, Marco4, ESPOSITO, Alessandra4, GIORDANO, Guido5, GARBE-SCHÖNBERG, Dieter6, AUGUSTIN, Nico7, MELCHERT, Bernd2 and HOCKING, Mike8, (1)Geology & Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO 80401, (2)Leibniz-Institute of Marine Sciences, Wischhofstrasse 1-3, Kiel, 24148, Germany, (3)Department of Earth Sciences, University of Ottawa, Marion Hall, 140 Louis Pasteur Street, Ottawa, ON K1S 0X7, Canada, (4)Istituto Nationale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, 00143, Italy, (5)Dipartimento Scienze Geologiche Universita Roma TRE, LS Leonardo Murialdo 1, Roma, 00146, Italy, (6)Geosciences, University of Kiel, Ludewig-Meyn-Straße 10, Kiel, 24118, Germany, (7)GEOMAR, Kiel, 24148, Germany, (8)Earth Sciences, University of Ottawa, Marion Hall 140 Louis Pasteur Street, Ottawa, ON K1S 0X7, Canada,

Explosive eruptions of hot water, steam, and non-aqueous gas are a common characteristic of the periodic behavior of subaerial geothermal systems. These highly destructive events may cause loss of life and substantial damage to infrastructure, especially in densely populated areas and where geothermal systems are actively exploited for energy. Here, the occurrence of a large number of eruption craters associated with the offshore venting of gas and thermal waters at Panarea, Italy, is reported, demonstrating that violent eruptions similar to those observed on land are also common in the shallow submarine environment. With diameters ranging from ten to over one hundred meters, the observed circular seafloor depressions record a history of major gas eruptions caused by frequent perturbation of the submarine geothermal system in the past 10,000 years. Estimates of the total gas flux indicate that the Panarea geothermal system released over 70 Mt of CO2 over this period of time, suggesting that gas venting at submerged arc volcanoes contributes significantly to the global atmospheric CO2 budget. The findings at Panarea highlight that shallow submarine gas eruptions represent a previously unrecognized volcanic hazard around populated volcanic islands that needs to be taken into account in the development of risk management strategies.
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