Mount Etna otherworldly associations of the great, volcanic mountain of their new home. Mediaevalist Roger Sherman Loomis quotes passages from the works of Gervase of Tilbury and Caesarius of Heisterbach (dating from the late twelfth century) featuring accounts of Arthur's returning of a lost horse which had strayed into his subterranean kingdom beneath Etna. Caesarius quotes as his authority for the story a certain canon Godescalcus of Bonn, who considered it a matter of historic fact of the time of Emperor Henry's conquest of Sicily "circa" 1194. Caesarius employs in his account the Latin phrase "in monte Gyber" ("within Etna") to describe
Mount Etna a few hours. Volcanic gas emissions from this volcano are measured by a Multi-Component Gas Analyzer System, which detects pre-eruptive degassing of rising magmas, improving prediction of volcanic activity. An eruption on 16 March 2017 injured 10 people, including a BBC News television crew, after magma exploded upon contact with snow. The Global Volcanism Program has assigned a volcanic explosivity index (VEI) to all of Mount Etna's eruptions since January 1955: In the 1970s Etna erupted smoke rings, one of the first captured events of this type, which are extremely rare. This happened again in 2000. Video footage of 8