Gulf of Gera Fault
The Gulf of Gera is a closed tectonic basin with a narrow opening. Ιt was created by large conjugate geological faults with NW-SE direction, at the eastern and western side of the gulf.
The continuous reactivation of the faults created tectonic steep scarps and terraces on the east side of the bay, extending south to the village of Loutra and northwards to the village of Pigi. Similar structures can be observed in the village of Ippios on the western coast of the gulf.
The faults of the Gulf of Gera are of particular importance because of their proximity to the city of Mytilene. Their maximum seismic potential reaches 6,5 on the Richter scale.
Along these faults, hot spring water gushes at the area of Therma in the Gulf of Gera. The water temperature is 39,7oC and the springs are defined as sodium chloride springs. The water contains ammonium chloride, sodium bromide, potassium nitrate, calcium chloride, magnesium chloride, etc.