Thermal springs

Thermal Springs are springs whose temperature varies from a few degrees above the average annual air temperature of the area to the boiling temperature. They are often post-volcanic events and the origin of their heat is due to geothermy. Their appearance and geographical distribution are mainly determined by the volcanism, which contributes to the heating of the water.
However, the tectonic events (faults) that occurred at the same time or after the volcanic activity, through which the water circulates before its exit to the surface, played a very important role.{cr} Therefore, the geographical distribution of thermal springs in Greece is not accidental. There is a large concentration of them in areas at the limit of lithospheric plates, where large tectonic events such as volcanic eruption phenomena or fissured zones have occurred.
Thermal Springs waters contain dissolved metallic compounds (sodium, potassium, calcium, magnesium, radio, iron, iodine, phosphorus and sulfur) or gases (carbon dioxide, hydrogen sulfide, nitrogen, oxygen and hydrogen). They have different degrees of acidity and are either acidic or alkaline or neutral.