Photographer: Lutz Geissler
Location: Sulphur Works, Lassen Volcanic National Park, California, USA
The area around the Lassen Peak, a volcanic pile at the northeastern flank of the former Tehama stratovolcano, is part of the famous Cascade Range. The Sulphur Works with the impressive solfatars are part of a large caldera that formed 350.000 years ago when the Tehama collapsed. The last activity of the Lassen volcano occured at the beginning of the 20th century. Today, just the solfatars report on processes that are pulling and pushing the Gorda and Juan de Fuca plate beneath the North American plate and creating that part of the pacific “ring of fire”. In Pleistocene the area around the Lassen Peak was influenced by glaciation. Many of the rocks one can find at Sulphur Works and the surrounding hills show glacier striations.