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

Robertson, J.; Roberts, G.P.; Iezzi, F.; Meschis, M.; Gheorghiu, D.M.; Sahy, D.; Bristow, C.; Sgambato, C.. 2020 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 of Structural Geology, 136, 104063. 10.1016/j.jsg.2020.104063

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Official URL: http://dx.doi.org/10.1016/j.jsg.2020.104063

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.jsg.2020.104063
ISSN:	01918141
Date made live:	31 Jul 2020 11:48 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528259

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/j.jsg.2020.104063

ISSN:

01918141

Date made live:

31 Jul 2020 11:48 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/528259