Hydrothermal eruptions of Nisyros (Dodecanese, Greece). Past events and present hazard
Identifieur interne : 000371 ( Main/Exploration ); précédent : 000370; suivant : 000372Hydrothermal eruptions of Nisyros (Dodecanese, Greece). Past events and present hazard
Auteurs : L. Marini [Italie] ; C. Principe [Italie] ; G. Chiodini [Italie] ; R. Cioni [Italie] ; M. Fytikas [Grèce] ; G. Marinelli [Italie]Source :
- Journal of Volcanology and Geothermal Research [ 0377-0273 ] ; 1993.
English descriptors
- KwdEn :
- Achelous, Anhydrite, Anhydrite veins, Aquifer, Aquifer temperature values, Argillic, Argillic alteration, Atmospheric agents, Ballistic ejecta, Caldera, Caldera depression, Chiodini, Cioni, Composite volcano, Crater, Debris flow deposits, Debris flows, Deep aquifer, Deposit, Diatomaceous clays, Ejecta, Eruption, Eruptive, Explosive phenomenon, Field evidence, Fracture, Fracture system, Fumarolic, Fumarolic fluids, Fytikas, Geothermal, Geothermal exploration, Gorceix, Historical descriptions, Historical records, Hydrothermal, Hydrothermal craters, Hydrothermal eruption, Hydrothermal eruptions, Hydrothermal explosion, Hydrothermal explosion craters, Hydrothermal explosions, Kaminakia, Keller, Lacustrine, Lakki, Lava, Lava blocks, Liquid phase, Liquid water, Lofos, Lofos area, Lofos dome, Major axis, Marinelli, Marini, Martelli, Matrix, Megalos, Morphological forms, Nisyros, Nisyros island, Phlegethon, Phlegethon crater, Polybotes, Polybotes crater, Polybotes megalos, Polybotes megalos crater, Polybotes megalos deposit, Polybotes megalos depression, Polybotes micros, Prominent ring, S6ances acad, Sandy matrix, Seismic, Seismic shocks, Shallow aquifer, Shallow system, Small gypsum crystals, Southern flank, Southern half, Stephanos, Stephanos crater, Stratigraphic sequence, Sudden uprise, Talus, Tectonic, Volcanol, Water content, Weight ratio.
- Teeft :
- Achelous, Anhydrite, Anhydrite veins, Aquifer, Aquifer temperature values, Argillic, Argillic alteration, Atmospheric agents, Ballistic ejecta, Caldera, Caldera depression, Chiodini, Cioni, Composite volcano, Crater, Debris flow deposits, Debris flows, Deep aquifer, Deposit, Diatomaceous clays, Ejecta, Eruption, Eruptive, Explosive phenomenon, Field evidence, Fracture, Fracture system, Fumarolic, Fumarolic fluids, Fytikas, Geothermal, Geothermal exploration, Gorceix, Historical descriptions, Historical records, Hydrothermal, Hydrothermal craters, Hydrothermal eruption, Hydrothermal eruptions, Hydrothermal explosion, Hydrothermal explosion craters, Hydrothermal explosions, Kaminakia, Keller, Lacustrine, Lakki, Lava, Lava blocks, Liquid phase, Liquid water, Lofos, Lofos area, Lofos dome, Major axis, Marinelli, Marini, Martelli, Matrix, Megalos, Morphological forms, Nisyros, Nisyros island, Phlegethon, Phlegethon crater, Polybotes, Polybotes crater, Polybotes megalos, Polybotes megalos crater, Polybotes megalos deposit, Polybotes megalos depression, Polybotes micros, Prominent ring, S6ances acad, Sandy matrix, Seismic, Seismic shocks, Shallow aquifer, Shallow system, Small gypsum crystals, Southern flank, Southern half, Stephanos, Stephanos crater, Stratigraphic sequence, Sudden uprise, Talus, Tectonic, Volcanol, Water content, Weight ratio.
Abstract
Abstract: The detailed analysis of the craters of hydrothermal eruptions and related products present on Nisyros Island demonstrates the ephemerality of these morphological forms. In other words, the mere recognizable existence of the craters and associated deposits implies recency of hydrothermal activity. The minimum temperature required to cause the explosive phenomenon and, possibly, the depth of the reservoir (which can be evaluated on the basis of the correlation between the diameter of the crater and the depth of explosion as proposed by Fytikas and Marinelli, 1976) are therefore closely representative of the current hydrothermal circulation.Both field evidence and historical records indicate that all the deposits of hydrothermal eruption recognized on Nisyros Island were emplaced as debris flows. Almost all the ballistic ejecta were entrained in these debris flows and either redeposited far from their landing sites or involved in later crater collapse and erosion. This emplacing mechanism implies that the original products were characterized by a water content higher than about 5% by weight.Steam-driven hydrothermal eruptions, one of which took place in 1871, originated deposits of limited dispersion, as no sign of these erodible products can be found in the field today.Surface geology and fluid geochemistry, together with subsurface information (e.g., primary and hydrothermal lithologies, distribution of temperature with depth, physical-chemical characteristics of deep water-bearing zones) indicate that two distinct hydrothermal aquifers are present underneath the southeastern part of the caldera floor. Both aquifers were probably involved in the most important historically documented hydrothermal eruptions, which occurred in 1873.At that time, violent earthquakes fractured the brittle aquiclude separating the two aquifers and caused a sudden transfer of fluids from the deep to the shallow aquifer, thus triggering the hydrothermal eruptions.Hydrothermal eruptions will probably occur in future, and this hazard must be taken into serious consideration. The southern half of Lakki plain, where all past eruptions took place and active fumaroles are concentrated is the zone at highest risk.At present, gas geochemistry represents an effective tool to detect changes in the P,T conditions of the shallow aquifer, and particularly the phenomena of pressure build-up that may lead to a hydrothermal eruption.
Url:
DOI: 10.1016/0377-0273(93)90051-R
Affiliations:
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Le document en format XML
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<term>Anhydrite</term>
<term>Anhydrite veins</term>
<term>Aquifer</term>
<term>Aquifer temperature values</term>
<term>Argillic</term>
<term>Argillic alteration</term>
<term>Atmospheric agents</term>
<term>Ballistic ejecta</term>
<term>Caldera</term>
<term>Caldera depression</term>
<term>Chiodini</term>
<term>Cioni</term>
<term>Composite volcano</term>
<term>Crater</term>
<term>Debris flow deposits</term>
<term>Debris flows</term>
<term>Deep aquifer</term>
<term>Deposit</term>
<term>Diatomaceous clays</term>
<term>Ejecta</term>
<term>Eruption</term>
<term>Eruptive</term>
<term>Explosive phenomenon</term>
<term>Field evidence</term>
<term>Fracture</term>
<term>Fracture system</term>
<term>Fumarolic</term>
<term>Fumarolic fluids</term>
<term>Fytikas</term>
<term>Geothermal</term>
<term>Geothermal exploration</term>
<term>Gorceix</term>
<term>Historical descriptions</term>
<term>Historical records</term>
<term>Hydrothermal</term>
<term>Hydrothermal craters</term>
<term>Hydrothermal eruption</term>
<term>Hydrothermal eruptions</term>
<term>Hydrothermal explosion</term>
<term>Hydrothermal explosion craters</term>
<term>Hydrothermal explosions</term>
<term>Kaminakia</term>
<term>Keller</term>
<term>Lacustrine</term>
<term>Lakki</term>
<term>Lava</term>
<term>Lava blocks</term>
<term>Liquid phase</term>
<term>Liquid water</term>
<term>Lofos</term>
<term>Lofos area</term>
<term>Lofos dome</term>
<term>Major axis</term>
<term>Marinelli</term>
<term>Marini</term>
<term>Martelli</term>
<term>Matrix</term>
<term>Megalos</term>
<term>Morphological forms</term>
<term>Nisyros</term>
<term>Nisyros island</term>
<term>Phlegethon</term>
<term>Phlegethon crater</term>
<term>Polybotes</term>
<term>Polybotes crater</term>
<term>Polybotes megalos</term>
<term>Polybotes megalos crater</term>
<term>Polybotes megalos deposit</term>
<term>Polybotes megalos depression</term>
<term>Polybotes micros</term>
<term>Prominent ring</term>
<term>S6ances acad</term>
<term>Sandy matrix</term>
<term>Seismic</term>
<term>Seismic shocks</term>
<term>Shallow aquifer</term>
<term>Shallow system</term>
<term>Small gypsum crystals</term>
<term>Southern flank</term>
<term>Southern half</term>
<term>Stephanos</term>
<term>Stephanos crater</term>
<term>Stratigraphic sequence</term>
<term>Sudden uprise</term>
<term>Talus</term>
<term>Tectonic</term>
<term>Volcanol</term>
<term>Water content</term>
<term>Weight ratio</term>
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<term>Anhydrite</term>
<term>Anhydrite veins</term>
<term>Aquifer</term>
<term>Aquifer temperature values</term>
<term>Argillic</term>
<term>Argillic alteration</term>
<term>Atmospheric agents</term>
<term>Ballistic ejecta</term>
<term>Caldera</term>
<term>Caldera depression</term>
<term>Chiodini</term>
<term>Cioni</term>
<term>Composite volcano</term>
<term>Crater</term>
<term>Debris flow deposits</term>
<term>Debris flows</term>
<term>Deep aquifer</term>
<term>Deposit</term>
<term>Diatomaceous clays</term>
<term>Ejecta</term>
<term>Eruption</term>
<term>Eruptive</term>
<term>Explosive phenomenon</term>
<term>Field evidence</term>
<term>Fracture</term>
<term>Fracture system</term>
<term>Fumarolic</term>
<term>Fumarolic fluids</term>
<term>Fytikas</term>
<term>Geothermal</term>
<term>Geothermal exploration</term>
<term>Gorceix</term>
<term>Historical descriptions</term>
<term>Historical records</term>
<term>Hydrothermal</term>
<term>Hydrothermal craters</term>
<term>Hydrothermal eruption</term>
<term>Hydrothermal eruptions</term>
<term>Hydrothermal explosion</term>
<term>Hydrothermal explosion craters</term>
<term>Hydrothermal explosions</term>
<term>Kaminakia</term>
<term>Keller</term>
<term>Lacustrine</term>
<term>Lakki</term>
<term>Lava</term>
<term>Lava blocks</term>
<term>Liquid phase</term>
<term>Liquid water</term>
<term>Lofos</term>
<term>Lofos area</term>
<term>Lofos dome</term>
<term>Major axis</term>
<term>Marinelli</term>
<term>Marini</term>
<term>Martelli</term>
<term>Matrix</term>
<term>Megalos</term>
<term>Morphological forms</term>
<term>Nisyros</term>
<term>Nisyros island</term>
<term>Phlegethon</term>
<term>Phlegethon crater</term>
<term>Polybotes</term>
<term>Polybotes crater</term>
<term>Polybotes megalos</term>
<term>Polybotes megalos crater</term>
<term>Polybotes megalos deposit</term>
<term>Polybotes megalos depression</term>
<term>Polybotes micros</term>
<term>Prominent ring</term>
<term>S6ances acad</term>
<term>Sandy matrix</term>
<term>Seismic</term>
<term>Seismic shocks</term>
<term>Shallow aquifer</term>
<term>Shallow system</term>
<term>Small gypsum crystals</term>
<term>Southern flank</term>
<term>Southern half</term>
<term>Stephanos</term>
<term>Stephanos crater</term>
<term>Stratigraphic sequence</term>
<term>Sudden uprise</term>
<term>Talus</term>
<term>Tectonic</term>
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<front><div type="abstract" xml:lang="en">Abstract: The detailed analysis of the craters of hydrothermal eruptions and related products present on Nisyros Island demonstrates the ephemerality of these morphological forms. In other words, the mere recognizable existence of the craters and associated deposits implies recency of hydrothermal activity. The minimum temperature required to cause the explosive phenomenon and, possibly, the depth of the reservoir (which can be evaluated on the basis of the correlation between the diameter of the crater and the depth of explosion as proposed by Fytikas and Marinelli, 1976) are therefore closely representative of the current hydrothermal circulation.Both field evidence and historical records indicate that all the deposits of hydrothermal eruption recognized on Nisyros Island were emplaced as debris flows. Almost all the ballistic ejecta were entrained in these debris flows and either redeposited far from their landing sites or involved in later crater collapse and erosion. This emplacing mechanism implies that the original products were characterized by a water content higher than about 5% by weight.Steam-driven hydrothermal eruptions, one of which took place in 1871, originated deposits of limited dispersion, as no sign of these erodible products can be found in the field today.Surface geology and fluid geochemistry, together with subsurface information (e.g., primary and hydrothermal lithologies, distribution of temperature with depth, physical-chemical characteristics of deep water-bearing zones) indicate that two distinct hydrothermal aquifers are present underneath the southeastern part of the caldera floor. Both aquifers were probably involved in the most important historically documented hydrothermal eruptions, which occurred in 1873.At that time, violent earthquakes fractured the brittle aquiclude separating the two aquifers and caused a sudden transfer of fluids from the deep to the shallow aquifer, thus triggering the hydrothermal eruptions.Hydrothermal eruptions will probably occur in future, and this hazard must be taken into serious consideration. The southern half of Lakki plain, where all past eruptions took place and active fumaroles are concentrated is the zone at highest risk.At present, gas geochemistry represents an effective tool to detect changes in the P,T conditions of the shallow aquifer, and particularly the phenomena of pressure build-up that may lead to a hydrothermal eruption.</div>
</front>
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