Numerical inversion and analysis of tephra fallout deposits from the 472 AD sub-Plinian eruption at Vesuvius (Italy) through a new best-fit procedure |
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| Authors: | R Bonasia G Macedonio A Costa D Mele R Sulpizio |
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| Institution: | 1. Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK;2. Cambridge Architectural Research, Unit 6, 25 Gwydir Street, Cambridge CB1 2LG, UK;3. Physics Department, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;4. Philippine Institute of Volcanology and Seismology, PHIVOLCS Building, C.P. Garcia Avenue, Diliman, Quezon City, 1101, Philippines;5. Department of Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand;1. Section of Earth and Environmental Sciences, University of Geneva, Switzerland;2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Italy;1. U.S. Geological Survey, Reston, VA, U.S.;2. Australian Bureau of Meteorology, Hydrology Unit, Melbourne, Victoria 3001, Australia;1. Faculty of Education, Kumamoto University, Kurokami 2-40-1, Chuo-ku, Kumamoto 860-8555, Japan;2. Miyakonojo Research Station, National Agricultural Research Center for Kyushu Okinawa Region, 6651-2 Yokoichi, Miyakonojo, Miyazaki 885-0091, Japan;3. Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan;1. Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy;2. Earthquake Research Institute, The University of Tokyo, Japan;3. Istituto Nazionale di Geofisica e Vulcanologia, Pisa, Italy;4. Met Office, Exeter, UK;5. Department of Geography, University of Cambridge, UK;6. U.S. Geological Survey, Cascades Volcano Observatory, USA;7. Department of Geology, University at Buffalo, USA;8. Icelandic Meteorological Office, Iceland;9. Barcelona Supercomputing Center, Barcelona, Spain;10. Istituto Nazionale di Geofisica e Vulcanologia, Naples, Italy;11. IPG Paris and Université Paris-Diderot, Paris, France;12. School of Earth Sciences, University of Bristol, UK;13. School of Mathematics, University of Bristol, UK;14. School of Earth and Atmospheric Sciences, Georgia Tech, USA;15. Department of Earth Sciences, University of Geneva, Switzerland |
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| Abstract: | A simple semi-analytical model for ash-fall deposit was applied to reconstruct the tephra deposits of the sub-Plinian 472 AD eruption of Vesuvius, Italy, which is of the scale of the reference eruptive scenario for the emergency planning, at Vesuvius. Applying a novel least-squares method, the bulk grain-size distribution, the total mass, and the eruption column height were obtained by fitting the computed ground load and granulometries with the observed ones. The analysis of the effect of three different weighting factors in the minimization procedure was also performed. Results showed that the statistical weighting factor produced the minimum bias. The best correlation between calculated and measured deposit was found, even though the quantity of the input data was not very high, as it commonly occurs for several ancient eruptions. Model results were also in agreement with estimations provided by other independent methods. |
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