Universität zu Köln

Mechernich, Silke ORCID: 0000-0003-3684-040X, Schneiderwind, Sascha, Mason, Jack, Papanikolaou, Ioannis D., Deligiannakis, Georgios ORCID: 0000-0002-3620-6153, Pallikarakis, Aggelos, Binnie, Steven A., Dunai, Tibor J. and Reicherter, Klaus (2018). The Seismic History of the Pisia Fault (Eastern Corinth Rift, Greece) From Fault Plane Weathering Features and Cosmogenic Cl-36 Dating. J. Geophys. Res.-Solid Earth, 123 (5). S. 4266 - 4285. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9356

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Abstract

The deformation of the eastern Corinth rift (Greece) is distributed along several E-W trending active normal faults. Here the 25-km-long Pisia fault experienced up to 150 cm of coseismic displacement during the 1981 Alkyonides earthquake sequence (M=6.7, 6.4, 6.3). Using terrestrial laser scanning, coupled with analyses of color changes, lichen colonization, and karstic features, we identify differentially weathered horizontal stripes on the exposed Pisia fault plane. The stripe boundaries occur at scarp heights of 1.10, 2.05, 2.85, 3.60, 4.15, and 5.15 m, with two additional possible boundaries at 3.10 and 4.65 m +/- 0.1 m, respectively). This indicates that six to eight paleoearthquakes have exhumed the fault plane in a series of distinct coseismic slip events. A vertical profile of cosmogenic Cl-36 measurements is used to constrain age models of the exhumation. The results imply that, in addition to the last earthquake of 1981 (EQ1), exhumation events occurred at similar to 2.0 kyr (EQ2), similar to 3.1 kyr (EQ3), similar to 4.5 kyr (EQ4/4a,b), similar to 6.0 kyr (EQ5), and similar to 7.3 kyr (EQ6/6a,b), with modeled age uncertainties of similar to 0.7kyr. Bayesian modeling provides a middle and late Holocene slip rate of 0.5-0.6mm/yr (last 7.30.7 kyr), while the upper part of the 8.45-m-high fault plane was exhumed at a higher rate of 0.8-2.3 mm/yr (7.3 +/- 0.7 kyr to 10.2 +/- 1.9 kyr). This slip rate variability suggests an increased seismicity or larger slip events during the early Holocene.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mechernich, Silke UNSPECIFIED orcid.org/0000-0003-3684-040X UNSPECIFIED Schneiderwind, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED Mason, Jack UNSPECIFIED UNSPECIFIED UNSPECIFIED Papanikolaou, Ioannis D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deligiannakis, Georgios UNSPECIFIED orcid.org/0000-0002-3620-6153 UNSPECIFIED Pallikarakis, Aggelos UNSPECIFIED UNSPECIFIED UNSPECIFIED Binnie, Steven A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dunai, Tibor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reicherter, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-187413
DOI:	10.1029/2017JB014600
Journal or Publication Title:	J. Geophys. Res.-Solid Earth
Volume:	123
Number:	5
Page Range:	S. 4266 - 4285
Date:	2018
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9356
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TECTONIC GEOMORPHOLOGY; QUATERNARY EVOLUTION; SURFACE OBSERVATIONS; PERACHORA PENINSULA; DEFORMATION RATES; ALKYONIDES GULF; SLIP DIRECTIONS; FOCAL MECHANISM; WEST EXTENSION; EARTHQUAKE Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18741