Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/15641
Authors: | Robertson, Jennifer* Roberts, G. P.* Iezzi, Francesco* Meschis, Marco* Gheorghiu, D. M.* Sahy, Diana* Bristow, C.* Sgambato, C.* |
Title: | Distributed normal faulting in the tip zone of the South Alkyonides Fault System, Gulf of Corinth, constrained using 36Cl exposure dating of late-Quaternary wave-cut platforms | Journal: | Journal of Structural Geology | Series/Report no.: | /136 (2020) | Publisher: | Elsevier | Issue Date: | 2020 | DOI: | 10.1016/j.jsg.2020.104063 | URL: | https://www.sciencedirect.com/science/article/pii/S0191814119304328 | Keywords: | Crustal Deformation Active Faults Absolute Dating Marine terraces |
Abstract: | The geometry, rates and kinematics of active faulting in the region close to the tip of a major crustal-scale normal fault in the Gulf of Corinth, Greece, are investigated using detailed fault mapping and new absolute dating. Fault offsets have been dated using a combination of 234U/230Th coral dates and in situ 36Cl cosmogenic exposure ages for sediments and wave-cut platforms deformed by the faults. Our results show that deformation in the tip zone is distributed across as many as eight faults arranged within ~700 m across strike, each of which deforms deposits and landforms associated with the 125 ka marine terrace of Marine Isotope Stage 5e. Summed throw-rates across strike achieve values as high as 0.3–1.6 mm/yr, values that are comparable to those at the centre of the crustal-scale fault (2–3 mm/yr from Holocene palaeoseismology and 3–4 mm/yr from GPS geodesy). The relatively high deformation rate and distributed deformation in the tip zone are discussed in terms of stress enhancement from rupture of neighbouring crustal-scale faults and in terms of how this should be considered during fault-based seismic hazard assessment. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
6- Robertson et al., 2020 (JSG)_Heraion125kaTerrace.pdf | restricted paper | 6.09 MB | Adobe PDF | |
Distributed normal faulting South Alkyonides Fault System.pdf | 3.21 MB | Adobe PDF | View/Open |
Page view(s)
80
checked on Apr 17, 2024
Download(s)
2
checked on Apr 17, 2024