Explosion craters associated with shallow submarine gas venting off Panarea island, Italy

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• 作者：Thomas Monecke (1)
  Sven Petersen (2)
  Mark D. Hannington (3)
  Marco Anzidei (4)
  Alessandra Esposito (4)
  Guido Giordano (5)
  Dieter Garbe-Sch?nberg (6)
  Nico Augustin (2)
  Bernd Melchert (2)
  Mike Hocking (3)
  
• 关键词：Gas explosions ; Geothermal systems ; Submarine gas venting ; Volcanic CO2 flux ; Volcanic hazards ; Panarea island
• 刊名：Bulletin of Volcanology
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：74
• 期：9
• 页码：1937-1944
• 全文大小：862KB
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• 作者单位：Thomas Monecke (1)
  Sven Petersen (2)
  Mark D. Hannington (3)
  Marco Anzidei (4)
  Alessandra Esposito (4)
  Guido Giordano (5)
  Dieter Garbe-Sch?nberg (6)
  Nico Augustin (2)
  Bernd Melchert (2)
  Mike Hocking (3)
  
  1. Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO, 80401, USA
  2. GEOMAR, Helmholtz Centre for Ocean Research Kiel, Wischhofstra?e 1-3, 24148, Kiel, Germany
  3. Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
  4. Istituto Nationale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, 00143, Rome, Italy
  5. Dipartimento Scienze Geologiche, Universita Roma TRE, LS Leonardo Murialdo 1, 00146, Rome, Italy
  6. Institute of Geosciences, University of Kiel, Ludewig-Meyn-Stra?e 10, 24118, Kiel, Germany
  
• ISSN：1432-0819

文摘

Explosions of hot water, steam, and gas are common periodic events 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. We report on the occurrence of a large number of explosion craters associated with the offshore venting of gas and thermal waters at the volcanic island of Panarea, Italy, demonstrating that violent explosions similar to those observed on land also are common in the shallow submarine environment. With diameters ranging from 5 to over 100?m, the observed circular seafloor depressions record a history of major gas explosions caused by frequent perturbation of the submarine geothermal system over 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 CO2 venting at submerged arc volcanoes contributes significantly to the global atmospheric budget of this greenhouse gas. The findings at Panarea highlight that shallow submarine gas explosions represent a previously unrecognized volcanic hazard around populated volcanic islands that needs to be taken into account in the development of risk management strategies.