Thermal anomalies in fumaroles at Vulcano island (Italy) and their relationship with seismic activity |
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| Institution: | 1. Bulgarian Academy of Sciences, National Institute of Geophysics, Geodesy and Geography, Department of Geodesy, Acad. G. Bonchev str, bl. 3, 1113 Sofia, Bulgaria;2. University of Architecture, Civil Engineering and Geodesy, Faculty of Geodesy, Department of Geodesy and Geoinformatics, 1, Hristo Smirnenski Blvd., 1046 Sofia, Bulgaria;3. Ecole Normale Supérieure, PSL Research University, Laboratoire de Géologie - UMR CNRS 8538, 24 Rue Lhomond, 75005 Paris, France;4. National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Thission, 11810 Athens, Greece;5. National Observatory of Athens, Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, Vas. Pavlou & I. Metaxa, GR-15 236 Penteli, Greece;6. Aristotle University of Thessaloniki, School of Geology, Department of Physical and Environmental Geography, 54124 Thessaloniki, Greece;1. Department of Geology, University of Otago, 360 Leith Walk, Dunedin, Otago 9054, New Zealand;2. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada;1. U.S. Geological Survey Geologic Hazards Science Center, Golden, CO, United States of America;2. Department of Earth Science and Earth Research Institute, University of California, Santa Barbara, CA, United States of America;3. U.S. Geological Survey Cascades Volcano Observatory, Vancouver, WA, United States of America;4. Western Washington University, Bellingham, WA, United States of America;5. U.S. Geological Survey Alaska Volcano Observatory, Anchorage, AK, United States of America;6. University of Washington, Seattle, WA, United States of America |
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| Abstract: | Fumarole thermal monitoring is a useful tool in the evaluation of volcanic activity, since temperatures strongly relate to the upward flux of magmatic volatiles. Once depurated from meteorological noise, their variations can reflect permeability changes due to crustal stress dynamics eventually associated to seismic activity. In this work, we discuss a fumarole temperature record acquired in the period September 2009–May 2012 at Vulcano island (Italy), during which changes of volcanic state, local seismic activity and teleseisms occurred. Apart from positive thermal anomalies driven by increments in volcanic activity, we observed 3 episodes at least of concurrence between tectonic earthquakes and fumarole temperature increments, with particular reference to the local August 16th, 2010 Lipari earthquake, the March 11th, 2011 Sendai–Honshu (Japan) earthquake and a seismic swarm occurred along the Tindari-Letojanni fault in July–August 2011. We interpreted the seismic-related anomalies as “crustal fluid transients”, i.e. signals of volcanogenic vapour flow variations induced by stress-induced permeability changes. From this perspective fumarolic activity can be considered as a tracer of geodynamic instability but, since seismic and volcanic phenomena are in mutual cause-effect relationships, a multidisciplinary observation system is mandatory for correctly addressing thermal data interpretation. |
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| Keywords: | Crustal transient Fumarole temperature Seismic activity Stress field Teleseism |
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