Regional deformation and offshore crustal local faulting as combined processes to explain uplift through time constrained by investigating differentially-uplifted Late Quaternary palaeoshorelines: the foreland Hyblean Plateau, SE Sicily
Meschis, Marco and Scicchitano, G. and Roberts, Gerald P. and Robertson, J. and Barreca, G. and Monaco, C. and Spampinato, C. and Sahy, D. and Antonioli, F. and Mildon, Z.K. and Scardino, G. (2020) Regional deformation and offshore crustal local faulting as combined processes to explain uplift through time constrained by investigating differentially-uplifted Late Quaternary palaeoshorelines: the foreland Hyblean Plateau, SE Sicily. Tectonics 39 (12), ISSN 0278-7407.
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Meschis et al. 2020 with Figures.pdf - Author's Accepted Manuscript Download (40MB) | Preview |
Abstract
Quaternary uplift is well documented in SE Sicily, a region prone to damaging seismic events, such as the 1693 “Val di Noto” Earthquake (Mw 7.4), the largest seismic event reported within the Italian Earthquake Catalogue, whose seismogenic source is still debated and, consequently, the long-term seismic hazard is poorly-understood. However, the spatial variation in the timing and rates of uplift are still debated, so it is difficult to link the dominant tectonic process(es) responsible for the uplift and the location of seismogenic sources. To better constrain the uplift rate, we have refined the dating of Late Quaternary marine terraces, using a synchronous correlation approach, driven by both published and newly obtained numerical age controls (234U/230Th dating on corals). This has allowed re-calculation of uplift rates along a N-S oriented transect within the Hyblean Plateau (HP) foreland region. Consequently, we have mapped the geometry of palaeoshorelines along a coastline-parallel transect, and hence the rates of uplift. The results suggest increasing uplift rate from south to north across the HP, and that uplift rates have remained constant through the late Quaternary. This spatially-changing but temporally constant uplift places constraints on the proportion of uplift produced by regional geodynamic processes versus produced by local faults, such as an offshore E-dipping active normal fault. We discuss these new findings in terms of the long-term seismic hazard for one of the most seismically-active regions in the Mediterranean Basin.
Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | Accepted for publication. Copyright American Geophysical Union. Further reproduction or electronic distribution is not permitted. |
| Keyword(s) / Subject(s): | marine terraces, uplift, normal faulting, viscous process, corals, synchronous correlation |
| School: | Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences |
| Depositing User: | Gerald Roberts |
| Date Deposited: | 05 Jan 2021 10:53 |
| Last Modified: | 02 Aug 2023 18:05 |
| URI: | https://eprints.bbk.ac.uk/id/eprint/41596 |
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