The Fethiye-Burdur fault zone is not a single line. Still, it consists of discontinuous northeast... more The Fethiye-Burdur fault zone is not a single line. Still, it consists of discontinuous northeasterly trending fault segments developed parallel to each other between the Gulf of Fethiye and Burdur Lake. The NE-trending and leftlateral oblique-slip Fethiye-Burdur fault zone bounds the Isparta Angle to the west and is probably a continuation of the Pliny fault zone of the Hellenic arc. Year 1914, 1957, and 1971 earthquakes occurred in the Fethiye-Burdur fault zone, with magnitudes of 7.1, 7.0, and 6.1, respectively. The epicenter distribution of the earthquakes of the last century indicates the continuation of the Fethiye- Burdur fault zone under the Gulf of Fethiye, probably to Rhodos Island. According to GPS measurements, the Fethiye-Burdur fault zone is the southern limit of the Aegean extensional region. The Aegean region is characterized by coherent motion toward the SW at 30 mm/yr relative to the Eurasian plate. Field observations and fault plane solutions of recent earthquakes...
8th Congress of the Balkan Geophysical Society, 2015
on and processing stages were carried out adequately. With respect to the suggestions of SESAME P... more on and processing stages were carried out adequately. With respect to the suggestions of SESAME Project, the reliability of H/V curves and the apex on the H/V curve representing a possible ground resonance frequency were investigated. There are 3 main suggestions of SESAME Project in order to determine the predominant period (T0) and investigate the reliability of H/V curves. These conditions are determining suitable number of windows, number of periods should be more than 200 and according to f0 value, standard deviation (σ) of H/V curve should be less than 3 if f0 0.5 Hz. Besides, at least 5 over 6 criteria of SESAME Project should be proved in order to obtain a reliable result from the calculated apex of a H/V curve. Thus, the apex of H/V curve can be accepted as a reliable peak and this proves the observer to determine reliable ground parameters as well. In this study, output file of the H/V curve obtained from the evaluation of the microtremor data using Geopsy software was evaluated by an Excel-based program to examine the criteria determined in the context of the SESAME Project. Also the flowchart of the algorithm is presented. Data were collected from the Bornova district of Izmir. The measurements were analysed and the results were interpreted.
7th Congress of the Balkan geophysical society, proceedings, 2013
Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researche... more Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researchers and many drillings has been opened in order to produce electricity and heating purposes. In the middle of May, 2012, a geothermal blowout occurred 150 m away from the deep drilling, during 1100 m, in Alkan village of Alasehir resort in city of Manisa. After that, 4 big blowouts happened at the same area and hot water had been diverted to Alkan stream for almost 4 months. In this study, it was intended to determine contaminated area by using magnetic susceptibility measurements for the surface and VLF-R method for underground layers. All of the susceptibility values were mapped and contaminated areas was clearly defined on the surface using 346 data points. Besides, VLF-R studies were carried out along 18 profiles each of a length of 170 m at three different frequencies with a station spacing of 5 m. Laterally constrained two layer inversion was applied to each station and in addition to the inversion of all profiles for each frequency, all lines were stacked and 2-D views of the possibly contaminated (low resistive) zones which are covering approximately 35000 m2 were obtained.
There are numerous geophysical methods used to investigate geothermal areas. The major purpose of... more There are numerous geophysical methods used to investigate geothermal areas. The major purpose of this magnetic survey is to locate the boudaries of active hydrothermal system in the South of Gediz Graben in Salihli (Manisa/Turkey). The presence of the hydrothermal system had already been inferred from surface evidence of hydrothermal activity and drillings. Firstly, it was necessary to convert the total field anomaly into a pseudo-gravity anomaly map. Then the geometric boundaries of the structures were determined by applying a MATLAB based software with 3 different edge detection algorithms. The exact location of the structures were obtained by using these boundary coordinates as initial geometric parameters in the inversion process. In addition to these methods, reduction to pole method was applied to the data to achieve more information about the location and shape of the possible reservoir. As a result, the edge detection methods were found to be successful in the field data se...
10th Congress of the Balkan Geophysical Society, 2019
Summary Gravity method is a natural potential field method which is frequently used in geophysica... more Summary Gravity method is a natural potential field method which is frequently used in geophysical investigations. The main principle of the method is to determine the buried structures in the ground by taking advantage of the changes in the vertical direction of gravity acceleration. There are many different methods developed to determine the depth of structures. In this study, the mean depth values of Bouguer gravity data obtained in Dikili district of Izmir province were determined using Radial Amplitude Power Spectrum Method (RAPSM) based on 2D Fourier transform. The greatest advantage of this method over the conventional power spectrum is that it works by determining the mean value of the cross-sections taken in different directions. Thus, it does not matter what direction the user takes the cross section and the depth of the structure can be determined more accurately. As a result of the application, the average depth values of the basement structure of the study area were determined. The topography of the basement structure varies between 320 m and 640 m in the region.
8th Congress of the Balkan Geophysical Society, 2015
There is a rapid increase in traffic caused environmental pollution due to increasing population ... more There is a rapid increase in traffic caused environmental pollution due to increasing population and number of motor vehicles. Especially many detrimental particles emitted by the vehicles reason grave soil pollution in roadsides. In addition, many scientific studies propose that these particles are detrimental for human health. Main purpose of this study is investigation of heavy metal pollution along several roadsides in city of Izmir by magnetic susceptibility measurements are often applied for investigating rock magntic properties, fire sites, landslide deposits, industrial, geothermal and soil pollution studies. Also one of the most frequent geophysical applications is traffic-related heavy metal pollution. In this study, magnetic susceptibility studies were carried out along the roads at Konak, Aliaga, Gulbahce and Buca districts of Izmir. The measurements were performed by using MS2E high-resolution surface scanning device produced by Bartington Company. The Bartington Instruments MS2 Magnetic Susceptibility System became popular for use in the laboratory and field in universities around the world. The highest magnetic susceptibility value was observed, as 15 times higher than the normal value, along Canakkale-Izmir highway which has the highest traffic density. Other study areas were Tinaztepe Campus road, Gulbahce Village road and Konak-Bornova Highway and magnetic susceptiblity values were observed 6,7 and 14 times higher than normal values respectively. Consequently, it was determined that roadside pollution degree can be determined precisely by using magnetic susceptibility measurements.
Pamukkale University Journal of Engineering Sciences, Nov 13, 2020
Usage of the least squares and inversion methods are commonly applied to the geophysical data ana... more Usage of the least squares and inversion methods are commonly applied to the geophysical data analysis. Solution of the theoretical anomalies of inclined sheet like bodies for the self-potential method were compared by writing a Fortran based computer program which is using simple iterative methods with damped least squares (Marquardt-Levenberg) algorithm. As a result of theoretical model studies, model parameters have been reached with very little number of iterations at the small error limits. Applied Marquardt-Levenberg method damping factor has been carried out automatically in the program depending on converging and non-converging conditions. Depth, horizontal length and starting point (0) parameters of the inclined sheet model were obtained within low error limits compared with the iteration methods for model and real field data. En küçük kareler ve ters çözüm yöntemlerinin kullanımı jeofizik veri analizinde yaygın olarak uygulanmaktadır. Eğilimli tabaka benzeri cisimlerin kuramsal anomalilerinin doğal potansiyel yöntemi için çözümü, basit yinelemeli yöntemler ve sönümlü en küçük kareler (Marquardt-Levenberg) yöntemi kullanılarak Fortran tabanlı bir bilgisayar programı yazılarak karşılaştırılmıştır. Kuramsal model çalışmaları sonucunda, küçük hata limitlerinde çok az sayıda yineleme ile model parametrelere ulaşılmıştır. Uygulanan Marquardt-Levenberg yöntemi sönümleme faktörü programda, yakınsak ve yakınsak olmayan koşullara bağlı olarak otomatik olarak gerçekleştirilmiştir. Eğimli levha modelinin derinlik, yatay uzunluk ve başlangıç noktası (0) parametreleri, model ve gerçek alan verileri için iterasyon yöntemleri ile karşılaştırıldığında düşük hata sınırları içinde elde edilmiştir.
Western Turkey is one of the most spectacular regions of widespread, active continental extension... more Western Turkey is one of the most spectacular regions of widespread, active continental extension in the world. The most prominent structures of this region are E–W trending Gediz and Büyük Menderes Grabens. Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researchers and many geothermal boreholes were drilled in order to produce electricity. In the middle of May 2012, a geothermal blowout occurred 150 m away from the deep drilling (depth 1,100 m), in Alkan village of Alaşehir resort in city of Manisa. After that, four big blowouts took place at the same area and thermal water had been diverted to Alkan stream for almost 4 months. The boron (B) and Fe levels of thermal water are 87 and 11.2 ppm where the background B and Fe values of topsoil vary between 0.2–1.5 ppm and 3.08–5.63 ppm, respectively. The objective of this study was to utilize joint magnetic susceptibility and VLF-R investigations to determine possibly contaminated area with B, related to high Fe level on the topsoil and thermal water in the subterranean layers. It is observed that magnetic susceptibility values vary between 500 and 790 cgs (×10−6) in the vicinity of blowouts and 150–340 cgs (×10−6) at a distance of 50 m around, where the background average value is 20 cgs (×10−6), by using the data collected at 346 stations. Besides, the VLF-R studies were carried out along 18 profiles at three different frequencies. Laterally constrained two-layer inversion was applied to each station; in addition to the inversion of all profiles for each frequency, all lines were stacked, 2-D resistivity maps were obtained, and the contaminated area was determined approximately as 35,000 m2. The results show not only satisfactory agreement between magnetic susceptibility and VLF-R data, but also provide fast and valued interpretation of geochemical and geophysical properties of the geothermal contaminated area.
Mitos Üyeleri. Türkçe Türkçe. English English; Türkçe. Üye Paneli. Üye Giriş Formu Kullanıcı Adı.... more Mitos Üyeleri. Türkçe Türkçe. English English; Türkçe. Üye Paneli. Üye Giriş Formu Kullanıcı Adı. Şifre. registration Kayıt Ol reset password Şifre Yenile. merkez Mitos Ulusal Açık Erişim Sistemi.
The magnetotelluric method is an electromagnetic survey technique that images the electrical resi... more The magnetotelluric method is an electromagnetic survey technique that images the electrical resistivity distribution of layers in subsurface depths. Magnetotelluric method measures simultaneously total electromagnetic field components such as both time-varying magnetic field B(t) and induced electric field E(t). At the same time, forward modeling of magnetotelluric method is so beneficial for survey planning purpose, for comprehending the method, especially for students, and as part of an iteration process in inverting measured data. The MTINV program can be used to model and to interpret geophysical electromagnetic (EM) magnetotelluric (MT) measurements using a horizontally layered earth model. This program uses either the apparent resistivity and phase components of the MT data together or the apparent resistivity data alone. Parameter optimization, which is based on linearized inversion method, can be utilized in 1D interpretations. In this study, a new MATLAB GUI based algorithm has been written for the 1D-forward modeling of magnetotelluric response function for multiple layers to use in educational studies. The code also includes an automatic Gaussian noise option for a demanded ratio value. Numerous applications were carried out and presented for 2,3 and 4 layer models and obtained theoretical data were interpreted using MTINV, in order to evaluate the initial parameters and effect of noise.
The Fethiye-Burdur fault zone is not a single line. Still, it consists of discontinuous northeast... more The Fethiye-Burdur fault zone is not a single line. Still, it consists of discontinuous northeasterly trending fault segments developed parallel to each other between the Gulf of Fethiye and Burdur Lake. The NE-trending and leftlateral oblique-slip Fethiye-Burdur fault zone bounds the Isparta Angle to the west and is probably a continuation of the Pliny fault zone of the Hellenic arc. Year 1914, 1957, and 1971 earthquakes occurred in the Fethiye-Burdur fault zone, with magnitudes of 7.1, 7.0, and 6.1, respectively. The epicenter distribution of the earthquakes of the last century indicates the continuation of the Fethiye- Burdur fault zone under the Gulf of Fethiye, probably to Rhodos Island. According to GPS measurements, the Fethiye-Burdur fault zone is the southern limit of the Aegean extensional region. The Aegean region is characterized by coherent motion toward the SW at 30 mm/yr relative to the Eurasian plate. Field observations and fault plane solutions of recent earthquakes...
8th Congress of the Balkan Geophysical Society, 2015
on and processing stages were carried out adequately. With respect to the suggestions of SESAME P... more on and processing stages were carried out adequately. With respect to the suggestions of SESAME Project, the reliability of H/V curves and the apex on the H/V curve representing a possible ground resonance frequency were investigated. There are 3 main suggestions of SESAME Project in order to determine the predominant period (T0) and investigate the reliability of H/V curves. These conditions are determining suitable number of windows, number of periods should be more than 200 and according to f0 value, standard deviation (σ) of H/V curve should be less than 3 if f0 0.5 Hz. Besides, at least 5 over 6 criteria of SESAME Project should be proved in order to obtain a reliable result from the calculated apex of a H/V curve. Thus, the apex of H/V curve can be accepted as a reliable peak and this proves the observer to determine reliable ground parameters as well. In this study, output file of the H/V curve obtained from the evaluation of the microtremor data using Geopsy software was evaluated by an Excel-based program to examine the criteria determined in the context of the SESAME Project. Also the flowchart of the algorithm is presented. Data were collected from the Bornova district of Izmir. The measurements were analysed and the results were interpreted.
7th Congress of the Balkan geophysical society, proceedings, 2013
Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researche... more Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researchers and many drillings has been opened in order to produce electricity and heating purposes. In the middle of May, 2012, a geothermal blowout occurred 150 m away from the deep drilling, during 1100 m, in Alkan village of Alasehir resort in city of Manisa. After that, 4 big blowouts happened at the same area and hot water had been diverted to Alkan stream for almost 4 months. In this study, it was intended to determine contaminated area by using magnetic susceptibility measurements for the surface and VLF-R method for underground layers. All of the susceptibility values were mapped and contaminated areas was clearly defined on the surface using 346 data points. Besides, VLF-R studies were carried out along 18 profiles each of a length of 170 m at three different frequencies with a station spacing of 5 m. Laterally constrained two layer inversion was applied to each station and in addition to the inversion of all profiles for each frequency, all lines were stacked and 2-D views of the possibly contaminated (low resistive) zones which are covering approximately 35000 m2 were obtained.
There are numerous geophysical methods used to investigate geothermal areas. The major purpose of... more There are numerous geophysical methods used to investigate geothermal areas. The major purpose of this magnetic survey is to locate the boudaries of active hydrothermal system in the South of Gediz Graben in Salihli (Manisa/Turkey). The presence of the hydrothermal system had already been inferred from surface evidence of hydrothermal activity and drillings. Firstly, it was necessary to convert the total field anomaly into a pseudo-gravity anomaly map. Then the geometric boundaries of the structures were determined by applying a MATLAB based software with 3 different edge detection algorithms. The exact location of the structures were obtained by using these boundary coordinates as initial geometric parameters in the inversion process. In addition to these methods, reduction to pole method was applied to the data to achieve more information about the location and shape of the possible reservoir. As a result, the edge detection methods were found to be successful in the field data se...
10th Congress of the Balkan Geophysical Society, 2019
Summary Gravity method is a natural potential field method which is frequently used in geophysica... more Summary Gravity method is a natural potential field method which is frequently used in geophysical investigations. The main principle of the method is to determine the buried structures in the ground by taking advantage of the changes in the vertical direction of gravity acceleration. There are many different methods developed to determine the depth of structures. In this study, the mean depth values of Bouguer gravity data obtained in Dikili district of Izmir province were determined using Radial Amplitude Power Spectrum Method (RAPSM) based on 2D Fourier transform. The greatest advantage of this method over the conventional power spectrum is that it works by determining the mean value of the cross-sections taken in different directions. Thus, it does not matter what direction the user takes the cross section and the depth of the structure can be determined more accurately. As a result of the application, the average depth values of the basement structure of the study area were determined. The topography of the basement structure varies between 320 m and 640 m in the region.
8th Congress of the Balkan Geophysical Society, 2015
There is a rapid increase in traffic caused environmental pollution due to increasing population ... more There is a rapid increase in traffic caused environmental pollution due to increasing population and number of motor vehicles. Especially many detrimental particles emitted by the vehicles reason grave soil pollution in roadsides. In addition, many scientific studies propose that these particles are detrimental for human health. Main purpose of this study is investigation of heavy metal pollution along several roadsides in city of Izmir by magnetic susceptibility measurements are often applied for investigating rock magntic properties, fire sites, landslide deposits, industrial, geothermal and soil pollution studies. Also one of the most frequent geophysical applications is traffic-related heavy metal pollution. In this study, magnetic susceptibility studies were carried out along the roads at Konak, Aliaga, Gulbahce and Buca districts of Izmir. The measurements were performed by using MS2E high-resolution surface scanning device produced by Bartington Company. The Bartington Instruments MS2 Magnetic Susceptibility System became popular for use in the laboratory and field in universities around the world. The highest magnetic susceptibility value was observed, as 15 times higher than the normal value, along Canakkale-Izmir highway which has the highest traffic density. Other study areas were Tinaztepe Campus road, Gulbahce Village road and Konak-Bornova Highway and magnetic susceptiblity values were observed 6,7 and 14 times higher than normal values respectively. Consequently, it was determined that roadside pollution degree can be determined precisely by using magnetic susceptibility measurements.
Pamukkale University Journal of Engineering Sciences, Nov 13, 2020
Usage of the least squares and inversion methods are commonly applied to the geophysical data ana... more Usage of the least squares and inversion methods are commonly applied to the geophysical data analysis. Solution of the theoretical anomalies of inclined sheet like bodies for the self-potential method were compared by writing a Fortran based computer program which is using simple iterative methods with damped least squares (Marquardt-Levenberg) algorithm. As a result of theoretical model studies, model parameters have been reached with very little number of iterations at the small error limits. Applied Marquardt-Levenberg method damping factor has been carried out automatically in the program depending on converging and non-converging conditions. Depth, horizontal length and starting point (0) parameters of the inclined sheet model were obtained within low error limits compared with the iteration methods for model and real field data. En küçük kareler ve ters çözüm yöntemlerinin kullanımı jeofizik veri analizinde yaygın olarak uygulanmaktadır. Eğilimli tabaka benzeri cisimlerin kuramsal anomalilerinin doğal potansiyel yöntemi için çözümü, basit yinelemeli yöntemler ve sönümlü en küçük kareler (Marquardt-Levenberg) yöntemi kullanılarak Fortran tabanlı bir bilgisayar programı yazılarak karşılaştırılmıştır. Kuramsal model çalışmaları sonucunda, küçük hata limitlerinde çok az sayıda yineleme ile model parametrelere ulaşılmıştır. Uygulanan Marquardt-Levenberg yöntemi sönümleme faktörü programda, yakınsak ve yakınsak olmayan koşullara bağlı olarak otomatik olarak gerçekleştirilmiştir. Eğimli levha modelinin derinlik, yatay uzunluk ve başlangıç noktası (0) parametreleri, model ve gerçek alan verileri için iterasyon yöntemleri ile karşılaştırıldığında düşük hata sınırları içinde elde edilmiştir.
Western Turkey is one of the most spectacular regions of widespread, active continental extension... more Western Turkey is one of the most spectacular regions of widespread, active continental extension in the world. The most prominent structures of this region are E–W trending Gediz and Büyük Menderes Grabens. Geothermal activity around city of Manisa in Gediz Graben has been investigated by many researchers and many geothermal boreholes were drilled in order to produce electricity. In the middle of May 2012, a geothermal blowout occurred 150 m away from the deep drilling (depth 1,100 m), in Alkan village of Alaşehir resort in city of Manisa. After that, four big blowouts took place at the same area and thermal water had been diverted to Alkan stream for almost 4 months. The boron (B) and Fe levels of thermal water are 87 and 11.2 ppm where the background B and Fe values of topsoil vary between 0.2–1.5 ppm and 3.08–5.63 ppm, respectively. The objective of this study was to utilize joint magnetic susceptibility and VLF-R investigations to determine possibly contaminated area with B, related to high Fe level on the topsoil and thermal water in the subterranean layers. It is observed that magnetic susceptibility values vary between 500 and 790 cgs (×10−6) in the vicinity of blowouts and 150–340 cgs (×10−6) at a distance of 50 m around, where the background average value is 20 cgs (×10−6), by using the data collected at 346 stations. Besides, the VLF-R studies were carried out along 18 profiles at three different frequencies. Laterally constrained two-layer inversion was applied to each station; in addition to the inversion of all profiles for each frequency, all lines were stacked, 2-D resistivity maps were obtained, and the contaminated area was determined approximately as 35,000 m2. The results show not only satisfactory agreement between magnetic susceptibility and VLF-R data, but also provide fast and valued interpretation of geochemical and geophysical properties of the geothermal contaminated area.
Mitos Üyeleri. Türkçe Türkçe. English English; Türkçe. Üye Paneli. Üye Giriş Formu Kullanıcı Adı.... more Mitos Üyeleri. Türkçe Türkçe. English English; Türkçe. Üye Paneli. Üye Giriş Formu Kullanıcı Adı. Şifre. registration Kayıt Ol reset password Şifre Yenile. merkez Mitos Ulusal Açık Erişim Sistemi.
The magnetotelluric method is an electromagnetic survey technique that images the electrical resi... more The magnetotelluric method is an electromagnetic survey technique that images the electrical resistivity distribution of layers in subsurface depths. Magnetotelluric method measures simultaneously total electromagnetic field components such as both time-varying magnetic field B(t) and induced electric field E(t). At the same time, forward modeling of magnetotelluric method is so beneficial for survey planning purpose, for comprehending the method, especially for students, and as part of an iteration process in inverting measured data. The MTINV program can be used to model and to interpret geophysical electromagnetic (EM) magnetotelluric (MT) measurements using a horizontally layered earth model. This program uses either the apparent resistivity and phase components of the MT data together or the apparent resistivity data alone. Parameter optimization, which is based on linearized inversion method, can be utilized in 1D interpretations. In this study, a new MATLAB GUI based algorithm has been written for the 1D-forward modeling of magnetotelluric response function for multiple layers to use in educational studies. The code also includes an automatic Gaussian noise option for a demanded ratio value. Numerous applications were carried out and presented for 2,3 and 4 layer models and obtained theoretical data were interpreted using MTINV, in order to evaluate the initial parameters and effect of noise.
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