1 Ocak 2015 Dergi makalesi Açık Erişim

Sankaya, M. A.; Yildirim, C.; Ciner, A.

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  <dc:creator>Sankaya, M. A.</dc:creator>
  <dc:creator>Yildirim, C.</dc:creator>
  <dc:creator>Ciner, A.</dc:creator>
  <dc:date>2015-01-01</dc:date>
  <dc:description>The Ecemis Fault Zone (EF) has been recognized as a major left lateral strike-slip fault in the Central Anatolian Fault Zone (CAFZ) of Turkey. However, its Quaternary slip-rate has been challenging to determine due to the difficulty of dating offset markers. Using high-precision offset measurements and Cl-36 cosmogenic nuclide dating, we present the first geochronologically determined Late Quaternary slip-rate for the EF. Our study focuses on the excellent exposures of offset alluvial fan surfaces, originating from the Aladaglar, a Late Quaternary glaciated mountain. Analysis of airborne orthophotogrametry and GNSS (Global Navigation Satellite System) surveys indicates 168 +/- 2 m left lateral and 31 +/- 1 m vertical displacements. In-situ terrestrial cosmogenic Cl-36 geochronology obtained from eleven surface boulders provides a minimum abandonment/incision age of 104.2 +/- 16.5 ka for the oldest offset alluvial fan surface. Our geomorphic observations together with Self-potential geophysical surveys revealed the presence of an unfaulted alluvial fan terrace, which allows us to constrain the timing of deformation. The abandonment/incision age of this fan is 64.5 +/- 5.6 ka based on thirteen Cl-36 depth profile samples. Accordingly, we obtained a geologic fault slip-rate of 4.2 +/- 1.9 mm a(-1) horizontally and 0.8 +/- 0.3 mm a(-1) vertically for the time frame between 104.2 +/- 16.5 ka and 64.5 +/- 5.6 ka. Our analysis indicates that the EF has not been producing a major surface breaking earthquake on the main strand at least since 64.5 +/- 5.6 ka (mid-late Pleistocene). This could be the result of abandonment of the main strand and accommodation of deformation by other faults within the EF. Nevertheless, a recently occurred (30 September 2011) low magnitude (ML: 43) left lateral strike-slip earthquake indicates recent seismic activity of the EF. Comparison of the recent GPS velocity field with the longer slip history along the CAFZ indicates a constant but low strain release without surface breaking and very long large earthquake recurrence intervals. (C) 2015 Elsevier B.V. All rights reserved.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/79783</dc:identifier>
  <dc:identifier>oai:zenodo.org:79783</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>TECTONOPHYSICS 649 33-46</dc:source>
  <dc:title>No surface breaking on the Ecemis Fault, central Turkey, since Late Pleistocene (similar to 64.5 ka); new geomorphic and geochronologic data from cosmogenic dating of offset alluvial fans</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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