Archive for the ‘Tectonics’ category

Ground-base LIDAR on the North Anatolian Fault

December 25, 2011

Copyright CSIRO 2003 ©

Karabacak et al. have published a study of the surface creep along the North Anatolian Fault in the EPSL. They used a ground-based light detection and ranging (LIDAR) system on an unreported site where three manmade walls across the fault were monitored for 3 yrs between 2007 and 2009. They found that 50–70% of the yearly slip accumulates on the faults creep section. Please find more info here doi:10.1016/j.epsl.2011.01.017

7.2M earthquake in the Eastern Turkey

October 24, 2011

A magnitude 7.2 earthquake occurred in eastern Turkey on 23 October 2011 on noon local time. CNN reports that several buildings have collapsed in Van Province.

Source: USGS

Earthquakes cycles recorded in calcite veins

February 8, 2011

Uysal et al. 2011 have published a new study about long term seismic cycles recorded in southwest Anatolian calcite veins. The study appeared in the Journal of Earth and Planetary Science Letters. They conducted high-resolution micro-sampling, high-precision U-series dating and micro- chemical analysis on an extensional vein system in a tectonically active area. U/Th ages of the vein system is in between 23.9±0.2 ka and 11.8±0.2ka. Their study offers an innovative means of constraining the absolute timing of late Quaternary seismic and inter-seismic events in Anatolia, Turkey. For more information, please refer to doi:10.1016/j.epsl.2010.12.039

From Uysal et al. (2011) © 2010 Elsevier

Geological history of western Turkey

August 22, 2010

A new study has been published in the Earth and Planetary Science Letters by van Hinsbergen et al. about the geological history of the western part of Turkey. They used African-Europe convergence amounts calculated from the Atlantic plate circuits and seismic tomography images from the west Anatolian mantle structure, and revealed the geological history since Cretaceous times in a context of convergence, subduction, collision and slab break-off. For further details please refer to  doi:10.1016/j.epsl.2010.07.024

Earthquake damage scenarios for Istanbul

July 26, 2010

Ansal et al., from Bogazici University, published a research study about a methodology for seismic microzonation and earthquake damage scenarios.  A pilot study is carried out to evaluate seismic damage in a district in Istanbul, which showed the significance of site characterization and site response analysis. Their results can be found in the journal of Soil Dynamics and Earthquake Engineering. doi:10.1016/j.soildyn.2010.06.004

Photo by Enric Marti (AA)

40Ar/39Ar geochronology of volcanic rocks in the Western Turkey

July 26, 2010

A new paper by Karaoglu et al. appeared in the Lithos about the petrogenesis and 40Ar/39Ar geochronology of volcanic rocks in Usak – Gure Basin, in the Western Turkiye! They published a new chronology for the volcanic rocks exposed on the northern margin of the Menderes Massif. According to their results, the oldest volcanic units are about 17-16 million years old, which indicate the volcanism active during the latest Early Miocene. The youngest ages were found to be around 12 million years old. doi:10.1016/j.lithos.2010.07.001

Photograph by Steve Mattox

Coastlines of Turkey

July 6, 2010

A new book chapter about the geomorphological features of Turkish coastlines appeared in the Encyclopedia of the World’s Coastal Landforms by Springer. It is the re-edited version of previously published chapter from The World’s Coasts: Online (2003) written by the famous geomorphologist Prof. Oguz Erol. It is a nice reference chapter to keep in mind. doi:10.1007/978-1-4020-8639-7_10.1