Δημοσιεύθηκε και αναρτήθηκε ηλεκτρονικά πριν από λίγες
μέρες (10.1) μετά από την έγκρισή της από την διεθνή επιστημονική κοινότητα
(1.12.2014) η μελέτη των επιστημόνων C.
Hübschera, Μ. Ruhnaua, και P. Nomikou (των Πανεπιστημίων Institute of Geophysics, Center for
Earth System Research and Sustainability, University of Hamburg, Bundesstrasse.
55, D-20146 Hamburg, Germany / Department of Geology and Geoenvironment,
University of Athens, Panepistimioupoli Zografou, 15784 Athens, Greece ) σχετικά με τα αποτελέσματα και συμπεράσματα της επιτόπιας μελέτης τους στο υποθαλάσσιο ηφαίστειο του Κολούμπου Β.Α. της Σαντορίνης.
Η μελέτη με τίτλο Volcano-tectonic evolution of the
polygenetic Kolumbo submarine volcano / Santorini (Aegean Sea) δημοσιεύθηκε στο πλαίσιο της έκδοσης της Journal of Volcanology and Geothermal Research.
Την ανάρτηση του sciencedirect.com μπορείτε να δείτε
εδώ : http://www.sciencedirect.com/science/article/pii/S0377027315000025
Η
μελέτη επιγραμματικά παρουσιάζει :
3D-architecture
of an explosive submarine volcano shown for the first time by reflection
seismic data interpretation.
Evidence for
abundant explosive underwater volcanism in the southern Aegean Sea
Hosting Anydros
basin (southern Aegean Sea) opened incrementally north-west to south-east
during four major pulses
Volcanic cones
adjacent to Kolumbo volcano evolved along an intra-basinal fault
Στο εισαγωγικό της σημείωμα από πλευράς του sciencedirect.com
αναφέρονται τα εξής :
Here we show for
the first time the 3D-structural evolution of an explosive submarine volcano by
means of reflection seismic interpretation. Four to five vertically stacked
circular and cone-shaped units consisting mainly of volcaniclastics build the
Kolumbo underwater volcano which experienced its first eruption > 70 ka ago
and its last explosive eruption 1650 AD, 7 km NE of Santorini volcano (southern
Aegean Sea). The summed volume of volcaniclastics is estimated to range between
13–22 km3. The entire Kolumbo volcanic complex has a height of ≥ 1 km and a
diameter of ≥ 11 km. All volcaniclastic units reveal the same transparent
reflection pattern strongly suggesting that explosive underwater volcanism was
the prevalent process. Growth faults terminate upwards at the base of
volcaniclastic units, thus representing a predictor to an eruption phase.
Similarities in seismic reflection pattern between Kolumbo and near-by volcanic
cones imply that the smaller cones evolved through explosive eruptions as well.
Hence, the central Aegean Sea experienced several more explosive eruptions (≥
23) than previously assumed, thus justifying further risk assessment. However,
the eruption columns from the smaller volcanic cones did not reach the air and–
consequently – no sub-aerial pyroclastic surge was created. The Anydros basin
that hosts Kolumbo volcanic field opened incrementally NW to SE and parallel to
the Pliny and Strabo trends during four major tectonic pulses prior to the
onset of underwater volcanism.
