1 Ocak 2015 Dergi makalesi Açık Erişim

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

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        "affiliation": "Istanbul Tech Univ, Eurasia Inst Earth Sci, TR-34469 Istanbul, Turkey", 
        "name": "Sankaya, M. A."
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      {
        "affiliation": "Istanbul Tech Univ, Eurasia Inst Earth Sci, TR-34469 Istanbul, Turkey", 
        "name": "Yildirim, C."
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      {
        "affiliation": "Istanbul Tech Univ, Eurasia Inst Earth Sci, TR-34469 Istanbul, Turkey", 
        "name": "Ciner, A."
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    "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.", 
    "doi": "10.1016/j.tecto.2015.02.022", 
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    "journal": {
      "pages": "33-46", 
      "title": "TECTONOPHYSICS", 
      "volume": "649"
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    "publication_date": "2015-01-01", 
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    "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"
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