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Examining several edge detection techniques in gravity method together with 3D bedrock topography: A case study from the northern part of the İzmir/Turkey

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Abstract

To determine the location and extent of buried geological structures, evaluation of gravity potential field data using edge detection methods is widely used, such as total horizontal derivative, tilt angle, the vertical derivative’s tilt angle and analytical signal methods. In the interpretation process of anomalies obtained from these methods, users do need additional physical parameters. So, in the first step of this study, results of the edge detection methods have been examined via synthetic models to put forward the availabilities of each method. Synthetic data studies show that the increase in noise level plays a direct role in determining the structure boundaries. The results obtained from the tilt angle application for high noise ratios give more inadequate results than other applications. Especially for high noise ratios, the most accurate structure boundaries are obtained with the total horizontal derivative (THD) applications. The data collected from Dikili, Çandarlı, Foça regions at 840 stations showed the presence of five remarkable Bouguer gravity anomaly localizations in the part of Bakırçay and Gediz graben. After that, according to the obtained findings, the methods have been applied to the field data and discussed. The location of the alluvial reservoir between Foça and Menemen was able to detect residual complete Bouguer anomaly map, Çandarlı volcanic intrusion is clearly seen on THD and analytical signal (AS) maps, Foça volcanics and Dumanlıdağ volcanic center were detected on tilt angle (TA) map. All these outputs of the area were interpreted in the scope of geological literature. Finally, these results were examined by combining them with the obtained 3-dimensional bedrock topography. 3-D bedrock inversion results clearly showed that the volcanic intrusion at the Çandarlı region is a reason for the recent topographical shape of the area, which also helps us to define the surface of the Bakırçay Graben’s related to hanging wall and its slope changes.

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Acknowledgements

The study was designed within the scope of Dokuz Eylül University Graduate School of Natural and Applied Sciences Dokuz Eylül University Scientific Research Coordination Unit (BAP) Project Number (2018.KB.FEN.020). This study has been created by enriching Mr Metehan Uluğtekin’s MSc thesis. Also, this study is a part of Mr Metehan Uluğtekin’s MSc thesis at Dokuz Eylül University, The Graduate School of Natural and Applied Sciences İzmir/Turkey too. We thank Assoc. Prof Dr Yunus Levent EKİNCİ for his constructive support and the Dokuz Eylül University Department of Geophysical Engineering for their equipment support to us.

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Metehan Uluğtekin: Collecting of field data, conceptualization, methodology, original draft preparation, Synthetic Model Studies, 3D inversion model study of the area, results and discussion. Tolga Gönenç: Collecting of field data, correction of field data set, conceptualization, methodology, original draft, project administration, results and discussion. Özkan Cevdet Özdağ: Field planning, collecting of field data, discussion.

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Correspondence to Tolga Gönenç.

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Communicated by Munukutla Radhakrishna

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Uluğtekin, M., Gönenç, T. & Özdağ, Ö.C. Examining several edge detection techniques in gravity method together with 3D bedrock topography: A case study from the northern part of the İzmir/Turkey. J Earth Syst Sci 131, 144 (2022). https://doi.org/10.1007/s12040-022-01891-4

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  • DOI: https://doi.org/10.1007/s12040-022-01891-4

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