Interpretation of Nisyros volcanic terrain using land surface parameters generated from the ASTER Global Digital Elevation Model
Identifieur interne : 000061 ( Main/Exploration ); précédent : 000060; suivant : 000062Interpretation of Nisyros volcanic terrain using land surface parameters generated from the ASTER Global Digital Elevation Model
Auteurs : Dimitrios Zouzias [Grèce] ; George Ch. Miliaresis [Grèce] ; Karen St. Seymour [Grèce, Canada]Source :
- Journal of volcanology and geothermal research [ 0377-0273 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Interprétation.
English descriptors
- KwdEn :
Abstract
To model the morphotectonic evolution of Nisyros stratovolcano in the Aegean Volcanic Arc (36° 35' N, 27° 10' E), a 30 m resolution ASTER GDEM was used. Nisyros is characterized by a relative pristine volcanic terrain. Elevation, slope and aspect images, the corresponding frequency distributions and rose diagrams enabled the geomorphometric analysis of Nisyros revealing the major geomorphological structures that are associated to both endogenetic and exogenetic processes acting on the island either new or previously reported in the literature. New elements include the number, loci of issue, relative age, ogive structures of the voluminous precalderan Nikia flows and their contact relationships with the Avlaki flows. The tectonic control, fine feature morphology and flow paths of lavas and smaller domes associated with the main postcalderan domes become visually apparent. Particularities of the hydrographic network accentuate and bring forward non-mapped radial faults. Intense landslide scarring and the volcanic stratigraphy of the intact units were revealed in the northeastern quadrant of Nisyros. Major, new volcano-tectonic features include the division of the island into three northwesterly trending sectors and the dipping of Nisyros towards the southeast as a result of segmentation by two major ring faults the Kos Ring Fault (KRF) and Perigussa Ring trapdoor Fault (PRF) which represent ring faults of the Kos sagging-caldera. The ASTER GDEM has provided suitable thematic information content in the geomorphometric analysis of Nisyros and therefore it offers a reconnaissance tool in the geomorphological analysis of a volcanic landscape.
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Nisyros is characterized by a relative pristine volcanic terrain. Elevation, slope and aspect images, the corresponding frequency distributions and rose diagrams enabled the geomorphometric analysis of Nisyros revealing the major geomorphological structures that are associated to both endogenetic and exogenetic processes acting on the island either new or previously reported in the literature. New elements include the number, loci of issue, relative age, ogive structures of the voluminous precalderan Nikia flows and their contact relationships with the Avlaki flows. The tectonic control, fine feature morphology and flow paths of lavas and smaller domes associated with the main postcalderan domes become visually apparent. Particularities of the hydrographic network accentuate and bring forward non-mapped radial faults. Intense landslide scarring and the volcanic stratigraphy of the intact units were revealed in the northeastern quadrant of Nisyros. Major, new volcano-tectonic features include the division of the island into three northwesterly trending sectors and the dipping of Nisyros towards the southeast as a result of segmentation by two major ring faults the Kos Ring Fault (KRF) and Perigussa Ring trapdoor Fault (PRF) which represent ring faults of the Kos sagging-caldera. The ASTER GDEM has provided suitable thematic information content in the geomorphometric analysis of Nisyros and therefore it offers a reconnaissance tool in the geomorphological analysis of a volcanic landscape.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Grèce</li></country></list><tree><country name="Grèce"><noRegion><name sortKey="Zouzias, Dimitrios" sort="Zouzias, Dimitrios" uniqKey="Zouzias D" first="Dimitrios" last="Zouzias">Dimitrios Zouzias</name></noRegion><name sortKey="Miliaresis, George Ch" sort="Miliaresis, George Ch" uniqKey="Miliaresis G" first="George Ch." last="Miliaresis">George Ch. Miliaresis</name><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name></country><country name="Canada"><noRegion><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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