Subaqueous fault scarps of the North Anatolian Fault in the Gulf of Saros (NE Aegean); where is the western limit of the 1912 Murefte-Sarkoy earthquake rupture?

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dc.authoridYavuzoglu, Asli Zeynep/0000-0003-2105-780X
dc.authoridAKSOY, Murat Ersen/0000-0002-7778-2018
dc.contributor.authorAksoy, M. Ersen
dc.contributor.authorMeghraoui, Mustapha
dc.contributor.authorPolonia, Alina
dc.contributor.authorCagatay, M. Namik
dc.contributor.authorYavuzoglu, Asli Zeynep
dc.contributor.authorOnder, Sebnem
dc.contributor.authorUlgen, Umut B.
dc.date.accessioned2025-01-27T20:14:47Z
dc.date.available2025-01-27T20:14:47Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe westernmost segment of the North Anatolian fault in NW Turkey lies mostly offshore, in the Sea of Marmara and the Gulf of Saros (NE Aegean), respectively to the E and W of a 45 km inland central portion. The 9 August 1912 Murefte-Sarkoy (M-s 7.4) and 13 September 1912 (M-s 6.8) earthquakes occurred along this segment. To date, the segment was studied mostly onshore although estimated magnitude and location suggest an offshore extension. Recent studies show the eastern rupture extension in the Sea of Marmara, while its western counterpart in the Gulf of Saros remains less documented. Here we use new observations from high-resolution marine geophysical data (multibeam bathymetry, side-scan-sonar, and seismic reflection profiles), to constrain the offshore 1912 ruptures in the Gulf of Saros. Detailed mapping of the subaqueous fine-scale morphology and structure of the fault provides a new insight for the western limit of the two 1912 surface ruptures. Distribution of fresh scarps, 3-D structural reconstructions, the complexity of fault segments, and the recent seismicity, altogether suggest that the western termination of the 1912 rupture(s) ends 37 km offshore in the Gulf of Saros. Following the 1999 Kocaeli earthquake, in the eastern Sea of Marmara, the unruptured segment length between the 1999 and 1912 ruptures became a critical issue, because of its implication for future earthquakes in the so-called Marmara seismic gap. If a 150-160 km total rupture length for the two 1912 earthquakes is assumed, a western rupture termination point at the inner Saros basin margin means that the eastern extension of the 9 August earthquake rupture reached the Central Marmara Basin. This outcome necessarily has implications for the seismic hazard in the Marmara coastal area that includes the Istanbul metropolitan area.
dc.description.sponsorshipITU EMCOL (Turkey); CNR ISMAR (Italy) project 'Evaluating the Seismic Risk in the Sea of Marmara'
dc.description.sponsorshipWe thank Captain Lubrano, Captain Lembo, CaptainGentile and the crew of R/V Urania for their invaluable assistance during all the Sea of Marmara and NE Aegean cruises. Naci Gorur coordinated the bilateral Turkish-Italian scientific project in Marmara. The.Istanbul MetropolitanMunicipality (IBB) funded partially the. ITU EMCOL (Turkey) & CNR ISMAR (Italy) project `Evaluating the Seismic Risk in the Sea of Marmara' (Turkish title: Marmara Denizi'nde Deprem Riskinin De.gerlendirilmesi) during the 2005 Urania cruise. The side-scan-sonar and chirp profile data used in the paper are available at the ISMAR repository at http://www.ismar.cnr.it/produ cts/data-sharing.
dc.identifier.doi10.1093/gji/ggab462
dc.identifier.endpage604
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85143066193
dc.identifier.scopusqualityQ1
dc.identifier.startpage589
dc.identifier.urihttps://doi.org/10.1093/gji/ggab462
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21202
dc.identifier.volume229
dc.identifier.wosWOS:000763887700003
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofGeophysical Journal International
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectEarthquake hazards
dc.subjectPalaeoseismology
dc.subjectContinental tectonics: strike-slip and transform
dc.subjectDynamics: seismotectonics
dc.subjectSubmarine tectonics and volcanism
dc.titleSubaqueous fault scarps of the North Anatolian Fault in the Gulf of Saros (NE Aegean); where is the western limit of the 1912 Murefte-Sarkoy earthquake rupture?
dc.typeArticle

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