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| Titel |
Assessing enigmatic boulder deposits in NE Aegean Sea: importance of historical sources as tool to support hydrodynamic equations |
| VerfasserIn |
M. Vacchi, A. Rovere, N. Zouros, M. Firpo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 4 ; Nr. 12, no. 4 (2012-04-19), S.1109-1118 |
| Datensatznummer |
250010705
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1109-2012.pdf |
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| Zusammenfassung |
| Due to their importance in the assessment of coastal hazards, several
studies have focused on geomorphological and sedimentological field evidence
of catastrophic wave impacts related to historical tsunami events. Among
them, many authors used boulder fields as important indicators of past
tsunamis, especially in the Mediterranean Sea. The aim of this study was to
understand the mechanism of deposition of clusters of large boulders,
consisting of beachrock slabs, which were found on the southern coasts of
Lesvos Island (NE Aegean Sea). Methods to infer the origin of boulder
deposits (tsunami vs. storm wave) are often based on hydrodynamic models even
if different environmental complexities are difficult to be incorporated
into numerical models. In this study, hydrodynamic equations did not provide
unequivocal indication of the mechanism responsible for boulder deposition
in the study area. Further analyses, ranging from geomorphologic to
seismotectonic data, indicated a tsunami as the most likely cause of
displacement of the boulders but still do not allow to totally exclude the
extreme storm origin. Additional historical investigations (based on tsunami
catalogues, historical photos and aged inhabitants interviews) indicated
that the boulders are likely to have been deposited by the tsunami triggered
by the 6.7 Ms Chios-Karaburum earthquake of 1949 or, alternatively, by minor
effects of the destructive tsunami produced by 1956's Amorgos Island
earthquake. Results of this study point out that, at Mediterranean scale, to
flank numerical models with the huge amount of the available historical data
become a crucial tool in terms of prevention policies related to
catastrophic coastal events. |
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