Tsurumi is made of lava domes. Tsurumi's first two known eruptions, in 200 and 771AD, produced new domes. The 200 AD eruption was large (VEI=4), explosive, and generated pyroclastic flows. The most recent eruption, in 867 AD, lasted two months and caused some damage.
Beppu, which includes numerous spas and resorts, is a thermal feature of Tsurumi. The next three photos are views of Blood Hell, the blood-red boiling lake at Beppu.
Umi (Ocean) Hell with its rich blue color. Umi is a thermal feature of Tsurumi.
Another of the Beppu hot lakes. People come to Beppu to enjoy the mineral-rich waters of the hotspring baths.
All photographs courtesy of and copyrighted by Mike Lyvers.
Source of Information:
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.