01/01/2025
Yesterday we came across an interesting and unusual feature that we've never encountered before in mountains (outside of Kamchatka in 2013). A deep crack/crevice was found near the summit of Morron de Enmedio at 1098m in the Sierra Elvira. The "Sima del Piornal". Coming up out of the crack was a constant strong blast of warm wind. This feature (the Raja Santa cavity) is just west of the summit if you want to experience this for yourselves. Natural warming for a cold winters day!
The first known explorations of the Raja Santa cavity date back to 1950 by a group of Granada cavers. The crack is a fracture of 160m depth and is quite wide. It reaches the phreatic and thermal level of the Sierra Elvira aquifer at 120m depth, containing slightly mineralized water and a temperature of 30º C. Upon reaching the end of the cave, there is an underground thermal water lagoon that "traditionally has transparent and crystalline water."
N.B Phreatic is a term used in hydrology to refer to aquifers, in speleology to refer to cave passages, and in volcanology to refer to a type of volcanic eruption.