On the effectiveness of directional derivative based filters on gravity anomalies for source edge approximation: synthetic simulations and a case study from the Aegean graben system (western Anatolia, Turkey)

Ekinci, Yunus Levent; Ertekin, Can; Yi̇ği̇tbaş, Erdi̇nç

doi:10.1088/1742-2132/10/3/035005

Cited by 51 publications

(21 citation statements)

References 55 publications

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“…Secondly, a profile curvature anomaly map (Figure 13) was produced to improve the possible geological boundaries and lineaments and also to compare the results with those obtained by analysing the THD magnitudes ( Figure 11) of the residual gravity data. Recently, the effectiveness of the technique on gravity and pseudogravity data-sets for contact mapping has been reported by some researchers (Ekinci, Balkaya, Şeren, Kaya, & Lightfoot, 2014;Ekinci, Ertekin, & Yiğitbaş, 2013a, 2013b. Briefly, profile curvature operator measures the rate of change of the slope in the direction of the steepest gradient at each point of the data (Cooper, 2009), and produces a zero contour value at the source edges and either a local maxima or minima over the causative sources (Lee, Morris, Leblanc, & Harris, 2013).…”

Section: Approximating the Locations Of The Causative Geological Strumentioning

confidence: 99%

Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

Ekinci

Yi̇ği̇tbaş

2015

Geodinamica Acta

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On the basis of gravity data, derived anomaly traces were presented for the interpretation of some shallow structural features of Biga and Gelibolu peninsulas. Since building general understanding of subtle details about subsurface geology is of great importance considering that the study area is tectonically important, some advanced data processing techniques were implemented to gravity anomalies in a detailed manner. The procedures were performed using a MATLABbased software package (Gravity and Magnetic Interpretation -GMINTERP). First, a finite element method was utilised to produce the residual data-set which is expected to reflect short wavelength anomalies arising from shallower geological structures, and thereafter some derivative-based algorithms were executed to analyse the residual data. The general anomaly patterns obtained from the applications clearly corresponded to the well-known surface geology map of the study area. Derivative-based anomaly maps put forward some findings about the existence of an old caldera structure in the western part of the Biga Peninsula. Additionally, abrupt lateral changes in anomaly amplitudes indicated the presence of some major structural discontinuities. Thus, findings yielded to make significant geological interpretations that might be important for further investigations. This study also showed that GMINTERP software package proved useful in assisting geological interpretation using geophysical potential field data-sets.

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Section: Approximating the Locations Of The Causative Geological Strumentioning

confidence: 99%

Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

Ekinci

Yi̇ği̇tbaş

2015

Geodinamica Acta

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“…The total thickness of sedimentary fill of the GDG reaches up to about 2500 m (Çiftçi and Bozkurt 2009). The hanging wall of the detachment fault is characterized by a Miocene to Pliocene sedimentary sequence of clastics labeled as Neogene rocks and by Quaternary alluvium (Ekinci et al 2013). …”

Section: Test With Real Datamentioning

confidence: 99%

A Comparative Study on Computing Horizontal Derivatives of Gravity Data for Geological Contact Mapping

Ekinci¹

2017

Türkiye Jeoloji Bülteni / Geological Bulletin of Turkey

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Abstract:Computations of x-and y-components of the horizontal derivatives (gradients) from an anomaly grid (with x-and y-axes directed east and north, respectively) still take an important place in potential field data-processing techniques. These techniques may successfully bring out some significant subtle details that are masked in the anomaly maps. Particularly abrupt lateral changes in densities and magnetizations effectively aid geological mapping and these changes may be traced by some derivative-based techniques without specifying any prior information about the nature of the potential field source bodies. Hence derivative-based techniques are regularly used in the visual interpretation of potential field anomalies. It is well known that computation of horizontal derivatives can be performed through either fast Fourier transform (i.e. in wave number domain) or simple finite-difference equations (i.e. in space domain) to outline the geological source boundaries (edges). Numerous studies including the use of either one have been recorded in the literature so far. In this study, comprehensive comparisons of the solutions obtained from those techniques have been made using both synthetically produced and real gravity data sets. Synthetic applications have been performed using both noise-free and noisy gravity data sets for two different depth-to-source scenarios. Thus not only the signal-to-noise ratios but also the depth-to-source conditions have been analyzed to test the performance of those approaches. Additionally, a real data experiment has been achieved using regional Bouguer gravity anomalies from a portion of a well-known geological setting, the Aegean Graben System (Western Anatolia, Turkey). Key Words: Fast Fourier transform, Finite-differences, First-order horizontal derivatives, Geological contact mapping, Gravity anomalies. Öz: Potansiyel alan verilerinin işlenmesinde belirti gridinden (x-ve y-eksenleri doğu ve kuzey yönelimli olacak şekilde) yatay türevlerin x-ve y-bileşenlerinin hesaplanması günümüzde de önemli bir yer tutar. Bu işlemlerle belirti haritalarında ilk bakışta gözlenemeyen önemli detaylar belirlenebilir. En önemlisi ise yoğunluk ve manyetizasyondaki

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“…In this study, pseudogravity anomaly map (Figure 11) was produced by using the same inclination and declination angles used for the RTP calculation. Because the shallow source bodies tend to produce gravity and pseudogravity anomalies with maximum horizontal gradients near their edges or boundaries (Balkaya et al, 2012;Blakely, 1995;Blakely & Simpson, 1986;Ekinci, Ertekin & Yiğitbaş, 2013), a total horizontal derivative (THD) anomaly map of the pseudogravity data was produced in the second step by using the following expression (Blakely, 1995):…”

Section: Boundary Analysismentioning

confidence: 99%

A geophysical approach to the igneous rocks in the Biga Peninsula (NW Turkey) based on airborne magnetic anomalies: geological implications

Ekinci

Yi̇ği̇tbaş

2012

Geodinamica Acta

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The Biga Peninsula, the complex geological structure of which has attracted intense attention so far, is located in the north-western part of Anatolia, Turkey. The Peninsula is tectonically very important region where different tectonic zones meet and comprises various kinds of sedimentary, metamorphic and igneous rocks. Among these rocks, igneous rocks occupy a considerably amount of areas in the Biga Peninsula and they are mostly associated with geothermal systems and mineral deposits, and therefore they play an important role in the geology of the Peninsula. In this paper, derived results concerning the geological features and subsurface structures of the igneous rocks in the Peninsula are presented based on analyzing the airborne magnetic anomalies. To this end, a MATLAB-based toolkit named as Gravity and Magnetic Interpretation (GMINTERP) that is composed of a set of linked functions in conjunction with a graphical user interface was developed and used for the interpretation of the airborne magnetic anomalies. Some linear transformations and derivative-based techniques were performed to process the potential field data-set and also to help build a general understanding of the geological details. The close agreement between the derived geophysical anomaly maps and the well-known surface geology map of the Biga Peninsula helped us discuss the geological implications of the geophysical traces. This study also indicated that the developed interactive data processing toolkit may assist geological interpretation even in the areas whose subsurface structure is poorly known.

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On the effectiveness of directional derivative based filters on gravity anomalies for source edge approximation: synthetic simulations and a case study from the Aegean graben system (western Anatolia, Turkey)

Abstract: A systematic method for characterizing the time-range performance of ground penetrating radar A D STRANGE GPR identification of voids inside concrete based on the support vector machine algorithm

Cited by 51 publications

References 55 publications

Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

Interpretation of gravity anomalies to delineate some structural features of Biga and Gelibolu peninsulas, and their surroundings (north-west Turkey)

A Comparative Study on Computing Horizontal Derivatives of Gravity Data for Geological Contact Mapping

A geophysical approach to the igneous rocks in the Biga Peninsula (NW Turkey) based on airborne magnetic anomalies: geological implications

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