Geoelectric Structure of Yalova-termal Town Bymagnetotelluric Data, Northwestern Turkey

Abstract

AbstractIn this study, the resistivity distribution of Termal town in the eastern Marmara region and its territory was investigated. Termal district is a seismically active region located between northern and southern branches of North Anatolian Fault in the Armutlu Peninsula. In the study area, magnetotelluric data were measured at 39 sounding locations. After the basic processing of collected MT data including the static shift correction, the resistivity structure of the corresponding area was obtained as a 3D earth model. Our aim is to obtain the underground conductivity structure of the study area, and to accomplish this, we utilize a well that produces hot water at a depth of 680 meters. The cross-sections in different directions obtained from the 3D earth model suggest that the study area is basically consisted of three distinguishable layers. The uppermost layer is a conductive layer and its thickness varies between 500 m and 1.5 km. 3D modelling of MT data infers a N-NW dipping major deep structure on the northern part of the Armutlu Peninsula. We propose that the north-dipping structure represents a tectonic contact between different tectonostratigraphic units exposed in the region. The results of this study and the geology of the region are compatible with each other. The result obtained from 3D MT, combined with the presence of a production well, confirms that the middle layer may serve as a potential aquifer for hot water in the surveyed area.