Potential of Shallow Lake Systems to Trace Environmental Changes Caused by Earthquakes

Date

2007-04-20

Author

Avşar, Ulaş
Hubert-ferrari, Aurelia
Fagel, Nathalie

Metadata

Show full item record

Item Usage Stats

31
views

0
downloads

Modern lake environments are studied as valuable data sources to trace environmental conditions of recent past. Some large lakes like the Dead Sea located along the Dead Sea Fault contain well-preserved paleoseismic records. We focus here on an other large strike-slip fault, the North Anatolian Fault (NAF) in Turkey. Through this fault is not the locus of large lakes comparable to the Dead Sea, we attempt to get a paleoseismic record from several shallow lakes located along the NAF. Within the scope of an EC-Marie Curie Excellence Grant Project entitled “Understanding the irregularity of seismic cycles: a case study in Turkey”, five shallow lakes (Ladik, Boraboy, Zinav, Göllüköy, and Asagitepecik), which are located the eastern NAF, will be investigated. Three destructive earthquakes took place in 1939 (Ms=7.9), 1942 (Ms=7.1) and 1943 (Ms=7.3) in that area. The finger-prints of these earthquakes are investigated in these five shallow lakes, in order to access potential environmental changes related to the earthquakes in each lakes. Approximately one-meter long gravity cores were taken from all lakes. We measured several parameters (e.g physical, mineralogical and geochemical proxies) to trace the effects of the last earthquake sequence. Measurements reflecting the physical properties of the sediment include magnetic susceptibility, water content, bulk density, electrical resistivity, p-wave velocity. Mineralogical and geochemical properties are constrained using X-ray diffraction, loss-on-ignition, total organic/inorganic carbon, atomic carbon/nitrogen, and organic carbon isotope ratios. The validity of the results is assessed with multivariate statistical methods. Here, we present results obtained from Ladik and Boraboy lakes. Longer cores will be collected during summer 2007 to get a long-term record of past earthquake activity. This research is complementary to conventional paleoseismological researches using trenching.

URI

https://hdl.handle.net/11511/77795

Conference Name

European Geophysical Union - General Assembly

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Effect of using multiple stream gauging stations on calibration of hydrologic parameters and estimation of hydrograph of ungauged neighboring basin Akay, Huseyin; Kocyigit, Musteyde Baduna; Yanmaz, Ali Melih (Springer Science and Business Media LLC, 2018-06-01) In this study, Hydrologic Engineering Center-Hydrologic Modeling System is used to simulate hydrologic processes in a watershed in Western Black Sea Region that frequently experiences flooding. The region is mountainous with steep hill slopes and receives high precipitation throughout the year. There are three stream gauging stations in the basin whose data are available for calibration and validation of hydrologic parameters. Simulations are performed for different scenarios to investigate the effect of us...
Integration of environmental variables with satellite images in regional scale vegetation classification Domaç, Ayşegül; Süzen, Mehmet Lütfi; Bilgin, Cemal Can (Informa UK Limited, 2006-04-01) The difficulty of collecting information at conventional field studies and relatively coarse spatial and spectral resolution of Landsat images forced the use of environmental variables as ancillary data in vegetation mapping. The aim of this study is to increase the accuracy of species level vegetation classification incorporating environmental variables in the Amanos Mountains region of southern central Turkey. In the first part of the study, ordinary vegetation classification is attained by using a maximu...
The effect of reed beds on wave attenuation and suspended sediment concentration Oğuz, Elif; Koroglu, Aysun; Kabdaşlı, Mehmet Sedat (Coastal Education and Research Foundation, 2013-01-01) The effect of emergent and submerged vegetation on uniform and oscillatory flow conditions has been intensively studied by researchers in the last two decades. It has been determined that vegetation affects wave characteristics and cause wave attenuation especially in shallow waters where wave orbitals are in interaction with vegetation. Consequently they affect sediment deposition and resuspension acting as a sink. The aim of this study is to determine wave attenuation due to vegetation, and to identify th...
Assessment of temporal variation and sources of PCBs in the sediments of Mediterranean Sea, Mersin Bay, Turkey Gedik, Kadir; İmamoğlu, İpek (Elsevier BV, 2011-01-01) Information on temporal distribution of polychlorinated biphenyls (PCBs) in the coastal sediments of Mediterranean Sea, Mersin was compiled using data published between 1980 and 2009, and the present study. The first congener specific PCB results from the region yield concentration levels of Sigma(41) PCBs in sediments ranging from 0.61 to 1.04 ng g(-1). Sediment profiles show penta-, hexa- and hepta-chlorobiphenyls, specifically, #149 and 153 as the most abundant congeners in all samples. Comparison of tot...
Impacts of eutrophication and water level change in turkish shallow lakes: a palaeolimnological approach utilizing plant remains and marker pigments Levi, Eti Ester; Beklioğlu, Meryem; Department of Biology (2016) Current study provides further understanding of plant macrofossil and sedimentary pigment utilization in comparison with modern and historical environmental variables. Moreover, it contributes to investigations for determining suitable macrophyte-based indices (water framework directive-WFD) that can be employed in Turkey. In total 44 small and mostly shallow lakes, covering the whole latitudinal gradient at western half of Turkey were sampled with snap-shot sampling and from another set of three large lake...

Citation Formats

U. Avşar, A. Hubert-ferrari, and N. Fagel, “Potential of Shallow Lake Systems to Trace Environmental Changes Caused by Earthquakes,” presented at the European Geophysical Union - General Assembly, 2007, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/77795.