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<title lang=en>Paleoseismology of the North Anatolian Fault at Güzelköy (Ganos segment, Turkey): Size and recurrence time of earthquake ruptures west of the Sea of Marmara</title>
<creator>Meghraoui, Mustapha</creator>
<creator>Aksoy, M. Ersen</creator>
<creator>Akyuz, H. Serdar</creator>
<creator>Ferry, Matthieu</creator>
<creator>Dikbas, Aynur</creator>
<creator>Altunel, Erhan</creator>
<contributor>DGDA ; Institut de physique du globe de Strasbourg (IPGS) ; Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de physique du globe de Strasbourg (IPGS) ; Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Eurasia Institute of Earth Sciences, Istanbul Technical University, 34469 Istanbul, (EIES, ITU) ; Eurasia Institute of Earth Sciences, Istanbul Technical University, 34469 Istanbul,</contributor>
<contributor>Istanbul Technical University, Maslak, Istanbul (ITU) ; Dept. of Geology, Madden Facultesi, Istanbul Technical University</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Eskişehir Osmangazi University, Eskişehir ; Dept. of Geology, Eskişehir Osmangazi University, Eskişehir, Turkey</contributor>
<contributor>EC Contract EVG1-2002-00069</contributor>
<description>International audience</description>
<source>ISSN: 1525-2027</source>
<source>EISSN: 1525-2027</source>
<source>Geochemistry, Geophysics, Geosystems</source>
<publisher>AGU and the Geochemical Society</publisher>
<identifier>hal-00748218</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00748218</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00748218</source>
<source>Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2012, 13 (4), pp.Q04005. 〈10.1029/2011GC003960〉</source>
<identifier>DOI : 10.1029/2011GC003960</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2011GC003960</relation>
<language>en</language>
<subject lang=en>1912 Mürefte earthquake</subject>
<subject lang=en>Ganos fault segment</subject>
<subject lang=en>Marmara</subject>
<subject lang=en>North Anatolian Fault</subject>
<subject lang=en>paleoseismology</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Ganos fault is the westernmost segment of the North Anatolian Fault that experienced the Mw = 7.4 earthquake of 9 August 1912. The earthquake revealed 45-km-long of surface ruptures inland, trending N70 E, and 5.5 m of maximum right lateral offset near Güzelköy. The long-term deformation of the fault is clearly expressed by several pull-apart basins and sag ponds, pressure and shutter ridges and offset streams. In parallel with detailed geomorphologic investigations, we measured co-seismic and cumulative displacements along the fault, and selected the Güzelköy site for paleoseismology. A microtopographic survey at the site yields 10.5 0.5 m and 35.4 1.5 m cumulative lateral offsets of stream channels and geomorphologic features. Seven paleoseismic parallel and cross-fault trenches document successive faulting events and provide the timing of past earthquakes on the Ganos fault segment. Radiocarbon dating of successive colluvial wedges in trench T1, and the fresh scarplet above (probably 1912 surface rupture) indicate the occurrence of three faulting events since the 14th century. Parallel trenches (3, 5, 6 and 7) expose paleo-channels and show a cumulative right-lateral offset of 16.5 1.5 m next to the fault, and 21.3 1.5 m total channel deflection. Radiocarbon dating of past channel units and fault scarp-related colluvial deposits imply an average 17 +/ 5 mm/year slip rate and 323 142 years recurrence interval of large earthquakes during the last 1000 years on the Ganos fault. The succession of past faulting events and inferred slip rate west of the Marmara Sea provide more constraint on the long-term faulting behavior in the seismic gap of the North Anatolian Fault and may contribute to a better seismic hazard assessment in the Istanbul region.</description>
<date>2012-04-12</date>
<contributor>European Project : </contributor>
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