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Interpretation of magnetic data using boundary analysis and inversion techniques: a case study from Gölcük/Isparta (Turkey) region

The investigation of magnetic field strength variations over subterranean layers may reveal their locations on Earth’s surface and provide physical and geometrical characteristics. Magnetic studies were carried out around Gölcük caldera lake using proton magnetometers to identify subsurface volcanic structures. The acquired data were inverted using four different edge detection algorithms such as analytic signal, tilt angle, theta map, horizontal gradient. Afterwards, the results were used to determine the locations of the anomalous structures. We also used pseudo-gravity and reduction-to-pole techniques for interpretation. | Turkish Journal of Earth Sciences Turkish J Earth Sci http journals.tubitak.gov.tr earth 2021 30 611-627 TÜBİTAK Research Article doi 10.3906 yer-2009-3 Interpretation of magnetic data using boundary analysis and inversion techniques a case study from Gölcük Isparta Turkey region Coşkun SARI Emre TİMUR Engineering Faculty Department of Geophysical Engineering Dokuz Eylül University İzmir Turkey Received 03.09.2020 Accepted Published Online 25.06.2021 Final Version 28.09.2021 Abstract The Gölcük Isparta is on the southern side of the city of Isparta in the Mediterranean region of Turkey. The investigation of magnetic field strength variations over subterranean layers may reveal their locations on Earth s surface and provide physical and geometrical characteristics. Magnetic studies were carried out around Gölcük caldera lake using proton magnetometers to identify subsurface volcanic structures. The acquired data were inverted using four different edge detection algorithms such as analytic signal tilt angle theta map horizontal gradient. Afterwards the results were used to determine the locations of the anomalous structures. We also used pseudo-gravity and reduction-to-pole techniques for interpretation. Additionally the magnetic data were evaluated using the power spectrum technique and the results were compared with the 2D and 3D prismatic inversion outcomes. As a result the boundaries and depth of the anomalous structures such as the trachytic dome south of the Gölcük were determined for three different cross-sections and areas. The results show that the anomalous dome structures average depth values vary between 225 m and 391 m in the region and the maximum depth of the Caldera reaches up to 1076 m. Key words Boundary analysis Gölcük caldera Isparta inversion power spectrum 1. Introduction Isparta Angle structure is still not clear Blumenthal 1963 Geothermal energy is sustainable reliable cost-effective and Glover and Robertson 1998 Yagmurlu et al. 1997 . Many .