Investigation of sinkholes in Kozaklı (Nevşehir) geothermal field using geophysical methods

In this article, the temporal and spatial development of probable sinkholes in close vicinity a couple that occurred 2007 2018 Kozaklı (Nevşehir) geothermal field, which is one most important thermal tourism centers where treatment with radon gases mud can be carried out Central Anatolia, was investigated using multi-electrode resistivity method core drilling data. The primary water aquifer consists Palaeozoic aged marbles, secondary Eocene limestone cover rocks are impermeable units area. Geothermal waters gain heat by gradient, granitic intrusions, radiogenic ways. depths, temperatures, pH values wells belonging to resources vary between 60 1493 m, 45 96 °C, as well 6.22 6.61, respectively. Two-dimensional electrical methods were used determine dimensions collapse structures. geophysical studies examining depths 15-30 meters, surface fractures around sinkhole, subsidence structure nearby active highway approximately 20 meters east, travertine found pothole, especially east north hollow structure. This data verified log obtained from drilling. These findings indicators for ongoing karstification process.