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    Marine effects on vertical electrical soundings along shorelines
    (Tubitak Scientific & Technological Research Council Turkey, 2017) Ulugergerli, Emin Ugur
    Onshore applications of direct current resistivity (DCR) along shorelines suffer a short-circuit-like phenomenon due to electrical current flowing through a more conductive body of water rather than ground. Our study of the numerical simulation of DCR data with a three-dimensional forward model demonstrated that the apparent resistivity was reduced as a function of the sea depth and the distance of measurement site to the shoreline. Furthermore, it was concluded that the marine effects on DCR data (i.e. reduction in apparent resistivity) become nonnegligible as the ratio of half-electrode expansion (AB/ 2) to the distance to the shoreline is larger than one. The reduction in apparent resistivity reaches its highest levels as the ratio approaches ten. Our survey conducted along the coastal line of Northwest Turkey clearly showed that if the marine effects are left untreated, one-or two-dimensional inversion yields incorrect resistivities for underlying units and therefore undermines the credibility of survey results. In the paper suggestions are made to handle such situations.
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    Using non-derivative filters for the tectonic implcations: A case study in simav graben in western turkey
    (J and N Group, Ltd., 2019) Toker, Ceyhan Ertan; Cakir, Recep; Ulugergerli, Emin Ugur
    Gravity data compiled for Simav Graben and its surrounding area in western Turkey were reprocessed and reinterpreted by using a type of standard deviation filter and Euler deconvolution methods. Results from the interpretation of gravity data and seismological studies show presences of new intrusive structures in the vicinity of Simav Graben. A prominent intrusion is located in the NE margin of the graben and has a thickness of 12-15 km at 2.5-3 km below the surface. Numerous earthquakes recorded in the eastern part of the graben are associated with this intrusions. Our multi-disciplinary study using gravity and seismological data clearly delineate the Simav Graben, characteristics of the Simav Fault, and identified intrusion was named as Naşa. Seismicity within the same tectonic frame are also well correlated with the intrusive structures identified on the filtered gravity anomalies. © (2019) by Environmental and Engineering Geophysical Society All rights reserved.