SEISMIC STRATIGRAPHY OF SANTORINI’S CALDERA: A CONTRIBUTION TO THE UNDERSTANDING OF THE MINOAN ERUPTION Sakellariou D. 1 , Rousakis G. 1 , Sigurdsson H. 2 , Nomikou P. 3 , Katsenis I. 4 , Croff Bell K.L. 2 , Carey S. 2 1 Inst. Oceanography, Hellenic Centre for Marine Research 2 Graduate School of Oceanography, University of Rhode Island, USA 3 Geology Dptm , National Kapodistrian University of Athens, Ilissia, Greece, 4 Geology Dptm., University of Patras 10 ο Πανελλήνιο Συμπόσιο Ωκεανογραφίας & Αλιείας 7-11 Μαϊου 2012, Αθήνα
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Seismic stratigraphy od Santorini's Caldera: a contribution to the understanding of the Minoan eruption. Sakellariou D.
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SEISMIC STRATIGRAPHY OF SANTORINI’S CALDERA: A CONTRIBUTION TO THE
Morphology of the submarine volcanic flanksYoung, upper slopes: steep, irregular
Old, lower slopes: gently sloping, smooth
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NORTH BASIN
Seismic stratigraphy of Santorini Caldera
NORTH BASIN
Seismic stratigraphy of Santorini Caldera
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NORTH BASIN
Seismic stratigraphy of Santorini Caldera
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NORTH BASIN
Seismic stratigraphy of Santorini Caldera
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NORTH BASIN
Seismic stratigraphy of Santorini Caldera
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WEST BASIN
Seismic stratigraphy of Santorini Caldera
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SOUTH BASIN
Seismic stratigraphy of Santorini Caldera
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SOUTH BASIN
Seismic stratigraphy of Santorini Caldera
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SOUTH BASIN
Seismic stratigraphy of Santorini Caldera
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SOUTH BASIN
Seismic stratigraphy of Santorini Caldera
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Kameni lavas
Floating pumice
PyroclasticsPyroclastics
Pre-Minoan
Pre-Minoan
Air-fall tephra
slide
Interpretation of the seismic stratigraphy of Santorini’s Caldera
Cape Riva CalderaEruption took place outside the Santorini Caldera.Cape Riva pyroclastics flew into the caldera through the northern corridor.
Structural evolution of Santorini’s Caldera
(i) the thickness of the Minoan deposits on the caldera seafloor exceeds 100 m locally,
(ii) post Minoan deposits are negligible,
(iii) the lower, gently sloping parts of the slopes around Kameni islands are of Minoan age,
(iv) all three subbasins of the caldera existed prior to the Minoan eruption and were filled with pyroclastics during and after the 17th cent. BC eruption
(v) the Minoan eruption center was located where the present day Kameni islands are.
RESULTS
EUROFLEETSCaldera 2012 – July 2012
Girona University - HCMR - IPGP - WHOI
Autonomous Underwater Vehicle “Girona 500”
Payload: multibeam, sidescan sonar, camera, mass spectrometer