Abstract: The Reşadiye (Tokat) geothermal field is located in the northern part of the right-lateral North AnatolianFault Zone. Geothermal waters at temperatures between 48-52°C from this geothermal field are currently usedmostly in hotels, pools and bathrooms and provide significant tourism potential for the region. The area where thegeothermal sites are located includes a ~NW-SE trending fissure-ridge type travertine with a length of about 600meters. Approximately 500 meters south of the geothermal field and parallel to the Kelkit River, the active segmentof the North Anatolian Fault Zone comprises the Kelkit Valley fault segment extending N72°W. The average strikedirection of Reşadiye fissure-ridge type travertine is around N33°W. There is an angle of 39° between the mastertrend of NAFZ and the direction of the Reşadiye fissure-ridge travertine. This 39° angle between the extensionalcracks in the fissure-ridge travertine and the NAFZ is compatible with extensional fractures developing in wellformed strike-slip faults at an angle of ~45° with the master fault. U/Th determination of two samples from bandedtravertines from the travertine deposits yielded ages of 7,563 and 12,529 years. Combined with other evidence, thesamples indicate an opening rate of 0.093 mm/year for the Reşadiye geothermal travertine field.