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| Titel |
Active faults and historical earthquakes in the Messina Straits area (Ionian Sea) |
| VerfasserIn |
A. Polonia, L. Torelli, L. Gasperini, P. Mussoni |
| 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. 7 ; Nr. 12, no. 7 (2012-07-24), S.2311-2328 |
| Datensatznummer |
250010995
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| Publikation (Nr.) |
 copernicus.org/nhess-12-2311-2012.pdf |
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| Zusammenfassung |
The Calabrian Arc (CA) subduction complex is located at the toe of the
Eurasian Plate in the Ionian Sea, where sediments resting on the lower plate
have been scraped off and piled up in the accretionary wedge due to the
African/Eurasian plate convergence and back arc extension. The CA has been
struck repeatedly by destructive historical earthquakes, but knowledge of
active faults and source parameters is relatively poor, particularly for
seismogenic structures extending offshore. We analysed the fine structure of
major tectonic features likely to have been sources of past earthquakes:
(i) the NNW–SSE trending Malta STEP (Slab Transfer Edge
Propagator) fault system, representing a lateral tear of the subduction
system; (ii) the out-of-sequence thrusts (splay faults) at the rear of the
salt-bearing Messinian accretionary wedge; and (iii) the Messina Straits
fault system, part of the wide deformation zone separating the western and
eastern lobes of the accretionary wedge.
Our findings have implications for seismic hazard in southern Italy, as we
compile an inventory of first order active faults that may have produced
past seismic events such as the 1908, 1693 and 1169 earthquakes. These
faults are likely to be source regions for future large magnitude events as
they are long, deep and bound sectors of the margin characterized by
different deformation and coupling rates on the plate interface. |
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