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

Authors: COŞKUN SARI, EMRE TİMUR

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.

Keywords: Boundary analysis, Gölcük caldera, Isparta, inversion, power spectrum

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