Unzen's most serious eruption came in 1792, when the collapse of one of the volcano's lava domes created an avalanche and tsunami that killed an estimated 14,524 people. Most of the people were killed by the tsunami.
This is a space radar image of the area around the Unzenvolcano, on the west coast of Kyushu Island in southwestern Japan.
Unzen, which appears in this image as a large triangular peak with a white flank near the center of the peninsula, has been continuously active since a series of powerful eruptions began in 1991.
Unzen is one of 15 "Decade" volcanoes identified by the scientific community as posing significant potential threats to large local populations.
The hot spring of Unzen is characterized by its sulfurous hot water with high acidity (pH: 2.0 - 2.2), which is uniquely high comparing to hot springs in Europe where the hot spring treatment is actively performed.
Unzen's hot spring is known by its component of hot water such as "acid hydrogen sulfide spring", "aluminiferous spring including hydrogen sulfide" or "ferrous sulfate spring" but it is generally called "sulfurous hot spring".
It is also noted that the Unzen hot spring is effective to facial treatment as well as effective against chronic rheumatism, diabetes, neuralgic pain, muscle pain, joint pain, and fatigue with health-promoting benefits.
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