Universität zu Köln

Mason, J., Schneiderwind, S., Pallikarakis, A., Wiatr, T., Mechernich, S., Papanikolaou, I. and Reicherter, K. (2016). Fault structure and deformation rates at the Lastros-Sfaka Graben, Crete. Tectonophysics, 683. S. 216 - 233. AMSTERDAM: ELSEVIER. ISSN 1879-3266

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Abstract

The Lastros and Sfaka faults have an antithetic relationship and form a ca. 2 km wide graben within the lerapetra fault zone in eastern Crete. Both faults have impressive bedrock fault scarps many metres in height which form prominent features within the landscape. t-LiDAR investigations undertaken on the Lastros fault are used to accurately determine vertical displacements along a ca. 1.3 km long scanned segment. Analyses show that previous estimations of post glacial slip rate are too high because there are many areas along strike where the scarp is exhumed by natural erosion and/or anthropogenic activity. In areas not affected by erosion there is mean scarp height of 9.4 m. This leads to a slip rate of 0.69 +/- 0.15 mm/a using,15 +/- 3 ka for scarp exhumation. Using empirical calculations the expected earthquake magnitudes and displacement per event are discussed based on our observations. Trenching investigations on the Sfaka fault identify different generations of fissure fills. Retrodeformation analyses and C-14 dating of the fill material indicate at least four events dating back to 16,055 +/- 21.5 cal BP, with the last event having occurred soon after 6102 +/- 113 cal BP. The Lastros fault is likely the controlling fault in the graben, and ruptures on the Lastros fault will sympathetically affect the Sfaka fault, which merges with the Lastros fault at a depth of 2.4 km. The extracted dates from the Sfaka fault fissure fills therefore either represent activity on the Lastros fault, assuming they formed coseismically, or accommodation events. Cross sections show that the finite throw is limited to around 300 m, and the derived slip rate for the Lastros fault therefore indicates that both faults are relatively young having initiated 435 +/- 120 ka. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mason, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneiderwind, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pallikarakis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiatr, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mechernich, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Papanikolaou, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reicherter, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-271907
DOI:	10.1016/j.tecto.2016.06.036
Journal or Publication Title:	Tectonophysics
Volume:	683
Page Range:	S. 216 - 233
Date:	2016
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1879-3266
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HELLENIC SUBDUCTION ZONE; WESTERN CRETE; LAZIO-ABRUZZO; SPARTA FAULT; AD 365; GREECE; ARC; EVOLUTION; EXHUMATION; INDICATORS Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27190