New high resolution aeromagnetic anomaly map of Türkiye and its various derivative-based maps

The magnetic method, which is a potential field method and is based on the differences in magnetic properties between underground structures, has been used quite widely for many years in different earth science studies, such as geological, tectonic, and archaeological research and metallic mine exploration.In areas where geography and weather conditions do not allow for the collection of geophysical measurements by land, such as some regions of Türkiye, airborne geophysical surveys are very important for the effective use of time and money.With airborne geophysical surveys, high-resolution data can be obtained across very large areas in a very short time.Geological and geophysical research institutions in many countries of the world collect geophysical data from the air in order to solve geological problems.The Department of Geophysical Research of the General Directorate of Mineral Research and Exploration of Türkiye (MTA) started airborne magnetic studies in 1978 and ended them in 1989 in order to search for subsurface resources throughout Türkiye.As part of the project, which lasted about 11 years, 446,700 km of profile flights were made, including the entire land of Türkiye, lakes, gulfs, and the Marmara Sea, and the total component of the Earth's magnetic field across the territory of 813,634 km 2 was measured.The flight altitude was selected as an average of 2000 feet (~600 m).Magnetic data was measured at different orientations within previously determined sectors and at variable profile intervals of one to five kilometers.According to the borderland agreements, it was not possible to approach the country's borders more than 15 km.The flights were conducted by fixed-wing aircraft belonging to the MTA.A large number of scientific studies were carried out using these data.Ateş et al. (2003) carried out a structural interpretation for the Marmara region (northwestern Türkiye), which is a seismically active region, with the help of airborne magnetic, gravity, and seismic data.Ateş et al. ( 2005) performed a Curie depth calculation for Central Anatolia using the early Abstract: Since Türkiye's territory is mostly mountainous and forested, earth science studies in these areas have not been completed at an adequate level and with a satisfying resolution.However, due to the long time and cost of collecting measurements from land in large-and medium-scale studies and due to the inability to collect measurements in regular grid intervals in large-scale studies to be carried out on land, an airborne geophysical survey project was conducted in order to collect high-resolution magnetic and radiometric country-scale data.Total magnetic field and radiometry data were collected from the air between 2017 and 2022 within the scope of the country-wide Airborne Geophysics Surveys Project.The data collection flights were carried out in such a way as to follow the topography from an altitude of about 200 m above the ground.The flights were carried out considering the regular geometry of the flight profile and the general geological and tectonic structure of Türkiye in the direction of N-S with one-kilometer profile intervals.A total field magnetic anomaly map was obtained after applying the diurnal, tie line leveling, IGRF (model 2020), and differential reduction to magnetic pole (DRTP) corrections to the magnetic data.For the scope of this study, the total field magnetic anomaly and the regional total field magnetic anomaly maps were presented along with the structural boundary maps (tilt angle (TA), the total horizontal derivative (THDR) and the analytical signal (AS)) derived from these maps.During another stage of the study, the general tectonic structure of Türkiye and structural boundaries obtained from derivative-based maps (AS, TA, and THDR) were compared.General geophysical interpretation was also performed with magnetic-anomaly and derivative-based maps for the three regions characterized by high magnetic anomalies.