Abstract
An underwater geomorphological survey along the coasts of six Cycladic islands (Sifnos, Antiparos, Paros, Naxos, Iraklia and Keros) revealed widespread evidence of seven submerged tidal notches. At least seven former shorelines were identified at depths between 280 ± 20 and 30 ± 5 cm below modern sea level. The vertical succession of several submerged notches suggests the occurrence of rapid subsidence events, potentially of seismic origin. Comparison with other sea-level indicators from Naxos and Delos islands indicates that these relative sea-level changes took place after 3300 BP and provides a rough estimate of the time of development of several submerged shorelines. The submergence of the uppermost notch at −30 ± 5 cm is ascribed to effects of the recent global sea-level rise occurred during the last two centuries and, at least in part, to effects of recent earthquakes. Potential effects of the 1956 Amorgos earthquake with regard to coseismic and post-seismic vertical displacement have been recently investigated using a modellistic approach. According to the above, the lower shorelines should result from repetitive subsidence events and not from gradual subsidence.
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Acknowledgments
We wish to thank the Municipalities of Paros, Naxos and Koufonissia for the facilities granted to our underwater survey and Dr. Stathis Stiros (University of Patras) Dr. Giorgio Spada (University of Urbino) and Dr. Stephano Furlani (University of Trieste) for useful suggestions. Field work has been supported in part by COST Action ES 0701 “Improved constraints on models of Glacial Isostatic Adjustment”. Special thanks to the anonymous reviewers whose comments helped authors to upgrade the paper.
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Evelpidou, N., Melini, D., Pirazzoli, P.A. et al. Evidence of repeated late Holocene rapid subsidence in the SE Cyclades (Greece) deduced from submerged notches. Int J Earth Sci (Geol Rundsch) 103, 381–395 (2014). https://doi.org/10.1007/s00531-013-0942-0
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DOI: https://doi.org/10.1007/s00531-013-0942-0