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Abstract: As high energy tsunami waves reach shallow near-shore environments, the height of the waves increasesand sea water propagates towards the land. During this movement, significant amounts of sediment are transportedinland from the nearshore, foreshore and beach. While a lagoon that is separated from the sea by a low, thin sandbarrier has a relatively calm depositional environment under normal conditions, during a tsunami the sea waterclimbs over the sand barrier and deposits material from the nearshore, foreshore and sand barrier onto inner partsof the lagoon. This phenomenon is the reason why investigation of sedimentary sequences in lagoons reveals thesedimentary traces of past tsunamis. In this study, the physical and geochemical properties of sediments in two ca.3.2 m-long cores collected from Karine Lagoon on the coast of Aydın-Söke (western Turkey) were investigated inorder to determine the traces of past tsunamis in the Aegean Sea. An ITRAX micro-XRF scanner was used to obtain0.2 mm-resolution radiographic images and 1mm-resolution XRF data from the cores. High-resolution analysis detected three heterogeneous and high-density intercalations within the relatively homogenous and occasionallylaminated background sediments. XRF data revealed that these intercalations had significantly higher Ca/Ti valuescompared to the background sediments, i.e. they were rich in carbonates. Observation under a stereo-microscopedetermined that while the background sediments contained fresh bivalve shells smaller than 1 cm in diameter, theintercalations contained weathered/broken bivalve shells approximately 4 cm in diameter. Considering the physicaland geochemical observations together, it was concluded that the intercalations containing relatively coarser andintensely-weathered bivalve shells are deposits that were transported from the sand barrier of the lagoon duringtsunamis. Radiocarbon dating shows that three intercalations in the sequence of Karine Lagoon were depositedduring the tsunamis, from AD 1956, 1650 and 1303.
Abstract: This study aims to investigate the tectonic activity with geomorphological indices within Burdur andYarışlı Basins in the south of Burdur. The study area consists of Jurassic Cretaceous ophiolitic melange, LateTriassic-Early Jurassic recrystallized limestone, Late Miocene Early Pliocene marl and clayed limestone and LatePliocene Early Pleistocene alluvial fan deposit. The study area covers the NE section of the Fethiye - Burdur FaultZone (FBFZ). The FBFZ, which caused many earthquakes in historical and instrumental periods, is representedby NE-SW trending Burdur, Karakent, Karacaören faults and NW-SE trending Karaçal fault. In addition there aremany small scale faults in the area. In order to determine the tectonic activity of the region, some geomorphologicalindices such as Mountain-Front Sinuosity (Smf), Ratio of Valley-Floor Width to Valley Height (Vf), NormalizedStream Length Gradient Index (SLK), Asymmetry Factor (AF), Topographic Symmetry Factor (T), and Indexof relative active tectonics (Iat) were calculated. The obtained data were compared with the field observations.According to the results, Smf ranges between 1.03-1.66, average Vf ranges between 0.28-10.85, average SLK rangesbetween 1.84-7.95 and T ranges between 0-0.6. The AF value of Burdur Basin is 60,14 whereas the Iat values of subareas cover Class-2 and Class-3. Geomorphic indices, confirming the other geological findings, show that the studyarea has moderate to high level tectonic activity.
Abstract: In this study, the aim is to determine the volcanic and tectonic structures developed in the Çan-EtiliLignite basin with the aid of satellite images. The Çan-Etili lignite basin consists of Oligocene-Early Miocenevolcanics (Çan Volcanics) overlying early-Middle Miocene lignite-bearing stream and lake sediments (Çan formation)occurring above an unconformity. In order to complete this study, two different satellite images (ASTER and ALOSPALSAR) and a digital elevation model (DEM) of the region were used. Multispectral optical remote sensing dataprovide information about material composition, while radar data reflect surface topography and morphology better.During mapping of lineaments on satellite images, in addition to visual assessment, image processing techniqueswere used. A variety of orientation filters were applied to ASTER satellite images for lineament mapping. Thelineaments on PALSAR images were determined with visual methods.Using DEM data along with ASTER and PALSAR satellite images for the study area, lineaments were mapped. Theresults were shown that a significant portion of the lineaments had NE-SW strike. This orientation coincides with theNE-SW striking Çan-Etili fault. Additionally, some curved linear structures were obtained from satellite images andare interpreted to be associated with caldera development.
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Abstract: Significantly rich assemblages of foraminifera (11 samples), ostracoda (8 samples) and mollusca (7samples) have been detected from the 14 samples recovered from the salty swamp plain behind a dunefield alongthe eastern coast of the Gulf of Saros, North Aegean Sea. Preliminary paleontological findings, together with theOptically Stimulated Luminescence (OSL) late Quaternary dating technique, have indicated that big-scale stormwaves and occasional tsunamis have inundated the large coastal areas at the eastern part of gulf, as much as a fewkilometres, in the past, at least during the last 2200 years.
Abstract: Because there are no wells in Iraq that go down to the basement complex of igneous and metamorphicrocks which are thought to be aggregated during the Late Precambrian, so the current study is important in trackingthe surface boundary with the sedimentary cover and try to identify the structural appearance and the effect of this inconstruction of the geological situation in the region. The geophysical survey included 87 magnetic measurementswith implantation the required corrections as well as using the upward continuation to remove the noises that notrequired in the present study.A quantitative interpretation has been made using Oasis Montaj program across five magnetic profiles (Tr1, Tr2, Tr3,Tr4, and Tr5) with control of well logging, gravity, and seismic information. The results showed varying depths ofthe basement rocks ranging from 10 km in the northeastern part (Aqra structure) to less than 6 km in the south-westof the study area. In addition, a number of grabens, half grabens and horsts have been simulated in the magneticsections for the present study.