Bektaş, Zeynep
The Gulf of Aqaba is located at the southern part of the Dead Sea Fault (DSF), the length of which is reaches approximately to 1200 km, extending up to Amuq valley in southern Turkey. The gulf is characterized by three pull-apart basins accommodating trans-tensional deformation. Although paleo-seismological information on the past devastating earthquakes that occurred on the on-shore part of DSF is available, it is lacking for the off-shore part of the DSF. In order to fill this information gap and to improve our knowledge about the location, 3D geometries and seismic potentials of the active fault segments in the region, the "Interdisciplinary earthquake hazard study - GAST Project" was initiated in the Gulf of Aqaba and Strait of Tiran in 2017. In this context, 23 short cores were collected from the gulf to investigate sedimentary traces of past earthquakes. Among these, 18 cores with lengths ranging between 35 and 107 cm were scanned by ITRAX micro-XRF scanner at a resolution of 0.5 mm. Radiographic imaging was carried out on 4.2 cm-wide and 0.8 cm-thick u-channels, which allows better evaluation of sedimentary structures. The radiographic images reveal that primary sedimentary structures are completely destroyed by extensive bioturbation, hampering the use of vi soft-sediment deformations for detecting past earthquakes. Turbidites, on the other hand, are clearly seen in the radiographs since they were deposited in a very short time and are least affected by bioturbation. In the radiographic images, fining upwards bedding is very common and the uppermost parts of the sequences appear finer and more homogeneous. Turbidites manifested geochemical anomalies in the ITRAX profiles, such as Zr/Ca, Ti/Ca, Rb/Ca confirming the relatively very quick deposition that did not allow almost any significant bio/geochemical contribution from the water column. Magnetic Susceptibility measurements were performed at 0.5 cm intervals along the full length of the cores. Dating of the deposits was performed by radionuclide (210Pb and 137Cs) and radiocarbon (14C) dating. High-resolution inter-core and inter-basinal stratigraphical correlations allowed the identification of turbidites triggered by AD 1068, 1212, 1588, 1839, and 1995 earthquakes. In addition, studies have enabled the source segments of these historical earthquakes to be understood. The segments in the Gulf of Aqaba are thought to have a recurrence interval of about 800 years.


Seismoturbidites in the Gulf of Aqaba during the past 500 years
Bektaş, Zeynep; Avşar, Ulaş (2019-04-12)
The Gulf of Aqaba, 180 km-long and approximately 15 km-wide, is located at the southernmost part of the left-lateral strike slip Dead Sea Fault (DSF). It is characterized by three pull-apart basins accommodating trans-tensional motion. Although paleoseismic data about the past devastating earthquakes on-shore DSF are available, our knowledge remains limited in the Gulf of Aqaba region. To improve our knowledge on the location and geometry of active faults in the region, its overall tectonics and its seismic...
Tectono-Sedimentary evolution and geochronology of the Middle Miocene Altinapa Basin, and implications for the Late Cenozoic uplift history of the Taurides, southern Turkey
KOÇ, AYTEN; Kaymakcı, Nuretdin; van Hinsbergen, Douwe J. J.; Kuiper, Klaudia F.; Vissers, Reinoud L. M. (2012-04-06)
The Tauride range in southern Turkey is flanked and overlain by Neogene sedimentary basins. To the south and on top of the high range, these basins are mainly marine, whereas poorly studied intramontane basins dominated by continental deposits are exposed to the north. In this paper, we study the stratigraphy and structure of the continental Altinapa Basin, and provide Ar-40/Ar-39 geochronology for volcanic deposits in the stratigraphy. The stratigraphy can be subdivided into a Lower Group, displaying simil...
Late Miocene transcurrent tectonics in NW Turkey: evidence from palaeomagnetism and 40Ar–39Ar dating of alkaline volcanic rocks
KAYMAKCI, N.; Kaymakcı, Nuretdin; LANGEREIS, C.; SPELL, T. L.; GURER, O. F.; ZANETTI, K. A. (Cambridge University Press (CUP), 2007-2-9)
<jats:p>A number of intra-continental alkaline volcanic sequences in NW Turkey were emplaced along localized extensional gaps within dextral strike-slip fault zones prior to the initiation of the North Anatolian Fault Zone. This study presents new palaeomagnetic and <jats:sup>40</jats:sup>Ar–<jats:sup>39</jats:sup>Ar geochronological results from the lava flows of NW Turkey as a contribution towards understanding the Neogene–Quaternary tectonic evolution of the region and possible roles of block rotations i...
Stratigraphy and Larger Foraminifera of the Eocene Shallow-marine and Olistostromal Units of the Southern Part of the Thrace Basin, NW Turkey
Özcan, Ercan; Less, Gyoergy; Okay, Aral; Baldi-Beke, Maria; Kollanyi, Katalin; Yılmaz, İsmail Ömer (2010-01-01)
The Eocene marine sequence in the southern part of the Thrace Basin (NW Turkey) involves a variety of platform and deep-marine olistostromal units, the stratigraphy of which have been vigorously debated in the past. A detailed analysis of larger foraminifera in these either foraminifera or foraminifera-coral-coralline algae-dominated platform and associated comparatively deeper-marine units permits us to establish a high-resolution biostratigraphy in the context of shallow benthic zonation (with SBZ zones) ...
Late Cretaceous-Eocene Geological Evolution of the Pontides Based on New Stratigraphic and Palaeontologic Data Between the Black Sea Coast and Bursa (NW Turkey)
Ozcan, Zahide; Okay, Aral; Özcan, Ercan; Hakyemez, Aynur; Altıner, Sevinç (2012-01-01)
The Late Cretaceous-Eocene geological evolution of northwest Turkey between the Black Sea and Bursa was studied through detailed biostratigraphic characterization of eleven stratigraphic sections. The Upper Cretaceous sequence in the region starts with a major marine transgression and lies unconformably on a basement of Palaeozoic and Triassic rocks in the north (Istanbul-type basement) and on metamorphic rocks and Jurassic sedimentary rocks in the south (Sakarya-type basement). Four megasequences have been...
Citation Formats
Z. Bektaş, “LATE HOLOCENE SEISMO-TURBIDITE INVESTIGATION IN THE SEDIMENTS OF GULF OF AQABA,” M.S. - Master of Science, Middle East Technical University, 2021.