A note on maar eruption energetics: current models and their application |
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| Authors: | Jacopo Taddeucci Gianluca Sottili Danilo M Palladino Guido Ventura Piergiorgio Scarlato |
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| Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy
2. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, P.le A. Moro 5, 00185, Rome, Italy
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| Abstract: | Hydromagmatic eruptions convert thermal into mechanical energy via the expansion of ground- and/or surface-water. Several
models address the energetics of these eruptions based on different physical-volcanological approaches. Here we test different
models with two case studies in the Colli Albani Volcanic District (central Italy): the monogenetic Prata Porci and the polygenetic
Albano maars. Test results are mutually consistent, and show cumulative mechanical energy releases on the order of 1015–1017 J for single maars. The fraction of thermal energy turned into mechanical ranges from 0.45 (as calculated from the theoretical
maximum mechanical energy), through 0.1 (calculated from country rock fragmentation, crater formation and ballistic ejection),
to 0.03 (derived from magma fragmentation by thermohydraulic explosions). It appears that the energy released during the most
intense hydromagmatic events may account for a dominant fraction of the total mechanical energy released during the whole
maar eruptive histories. Finally, we consider the role of magmatic explosive activity intervening during maar eruptions in
causing departures from predictions of the models evaluated. |
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