Per citar aquest document: http://ddd.uab.cat/record/117224
The 2005 - 2007 Bala (Ankara, central Turkey) earthquakes : a case study for strike-slip fault terminations
Esat. K. (Ankara University. Department of Geological Engineering. Tectonics Research Group)
Çivgin, B. (Ankara University. Department of Geophysical Engineering)
Kaypak, B. (Ankara University. Department of Geophysical Engineering)
Isik, V. (Ankara University. Department of Geological Engineering. Tectonics Research Group)
Ecevitoglu, B. (Anadolu University, Earth and Space Sciences Research Institute)
Seyitoglu, G. (Ankara University. Department of Geological Engineering. Tectonics Research Group)

Data: 2014
Resum: An intense seismic activity has been observed after the Bala (Ankara, NW central Turkey) earthquakes (30 July 2005: Mw=5. 3, 20 December 2007: Mw=5. 4, and 26 December 2007: Mw=5. 3), continuing up to the present. The epicenters and the focal mechanism solutions of the earthquakes indicate that the right lateral strike-slip Afşar fault, trending N55-60°W, is responsible for the main shocks. The Afşar fault is thought to be the NW continuation of the Tuzgölü fault zone, which is one of the main neotectonic elements in central Anatolia. On the other hand, the aftershock distributions of the 2005 event have a NNE trend, and those of the 2007 event show a NW trending. Some focal mechanism solutions of the 2005 Bala earthquake aftershocks indicate normal and oblique normal faulting that corresponds to the NNE-trending Karakeçili fault. It seems that seismic activation of the NNE-trending Karakeçili fault was triggered by the 2005 main shock (Mw=5. 3) that occurred on the NW-trending right lateral strike-slip Afşar fault. The overall neotectonic framework is that the northwestern edge of the Tuzgölü fault zone, represented by the Afşar fault in Bala, terminates in an extensional system represented by the oblique-slip Karakeçili fault.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: Strike-slip faults ; Fault terminations ; Tuzgölü fault zone ; Neotectonics ; Bala earthquake ; Anatolia
Publicat a: Geologica acta, Vol. 12, Núm. 1 (March 2014) , p. 71-85, ISSN 1696-5728

Adreça alternativa: http://www.raco.cat/index.php/GeologicaActa/article/view/275590
DOI: 10.1344/105.000002075


19 p, 10.0 MB

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