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| Titel |
Quaternary active tectonic structures in the offshore Bajo Segura basin (SE Iberian Peninsula – Mediterranean Sea) |
| VerfasserIn |
H. Perea, E. Gràcia, P. Alfaro, R. Bartolomé, C. Iacono, X. Moreno, E. Masana, EVENT-SHELF Team |
| 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. 10 ; Nr. 12, no. 10 (2012-10-23), S.3151-3168 |
| Datensatznummer |
250011149
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3151-2012.pdf |
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| Zusammenfassung |
| The Bajo Segura fault zone (BSFZ) is the northern terminal splay of the
Eastern Betic shear zone (EBSZ), a large left-lateral strike-slip fault
system of sigmoid geometry stretching more than 450 km from Alicante to
Almería. The BSFZ extends from the onshore Bajo Segura basin further
into the Mediterranean Sea and shows a moderate instrumental seismic
activity characterized by small earthquakes. Nevertheless, the zone was
affected by large historical earthquakes of which the largest was the 1829
Torrevieja earthquake (IEMS98 X). The onshore area of the BSFZ is
marked by active transpressive structures (faults and folds), whereas the
offshore area has been scarcely explored from the tectonic point of view. During
the EVENT-SHELF cruise, a total of 10 high-resolution single-channel
seismic sparker profiles were obtained along and across the offshore Bajo Segura
basin. Analysis of these profiles resulted in (a) the identification of 6
Quaternary seismo-stratigraphic units bounded by five horizons corresponding
to regional erosional surfaces related to global sea level lowstands; and
(b) the mapping of the active sub-seafloor structures and their correlation with
those described onshore. Moreover, the results suggest that the Bajo Segura
blind thrust fault or the Torrevieja left-lateral strike-slip fault, with
prolongation offshore, could be considered as the source of the 1829
Torrevieja earthquake. These data improve our understanding of present
deformation along the BSFZ and provide new insights into the seismic hazard
in the area. |
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