is a active
stratovolcano
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and per ...
in
Kusatsu, Gunma
250px, Kusatsu town hall
is a town located in Gunma Prefecture, Japan. , the town had an estimated population of 6,255 in 3407 households, and a population density of 130 persons per km2. The total area of the town is . Kusatsu is one of the mos ...
,
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. It is called Kusatsu Shirane to differentiate it from the
Mount Nikkō-Shirane on the other side of
Gunma Prefecture
is a prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 (1 October 2019) and has a geographic area of 6,362 km2 (2,456 sq mi). Gunma Prefecture borders Niigata Prefecture and Fukushima ...
. The summit of Kusatsu-Shirane volcano, located immediately north of
Asama volcano, consists of a series of overlapping
pyroclastic cone
Volcanic cones are among the simplest volcanic landforms. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature and s ...
s and three
crater lake
Crater Lake (Klamath language, Klamath: ''Giiwas'') is a volcanic crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity. The ...
s. The largest of these is Yu-gama, an acidic emerald green lake with rafts of yellow
sulfur
Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula ...
sometimes seen floating on its surface.
On January 23, 2018, a minor
phreatic eruption
A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, occurs when magma heats ground water or surface water. The extreme temperature of the magma (anywhere from ) causes near-instantaneous evapo ...
of the volcano occurred. One person was killed, and others were injured in an
avalanche
An avalanche is a rapid flow of snow down a slope, such as a hill or mountain.
Avalanches can be set off spontaneously, by such factors as increased precipitation or snowpack weakening, or by external means such as humans, animals, and earth ...
triggered by the eruption. The next day, new activity forced police to suspend search operations. One month after the eruption, it was announced by prefectural officials that only the summit of the volcano was off limits to the public.
See also
*
List of volcanoes in Japan
This is a list of active and extinct volcanoes in Japan. An Orange background indicates a volcano considered active by the Japan Meteorological Agency.
Hokkaido
Honshū
Izu Islands
Ogasawara Archipelago
The Ogasawara Archipelag ...
*
List of mountains in Japan
The following is a list of the mountains and hills of Japan, ordered by height.
Mountains over 1000 meters
Mountains under 1000 meters
As the generally accepted definition of a mountain (versus a hill) is 1000 m of height and 500 m of prom ...
References
External links
Kusatsu-Shiranesan- Japan Meteorological Agency
* - Japan Meteorological Agency
- Geological Survey of Japan
Mountains of Gunma Prefecture
Volcanoes of Honshū
Active volcanoes
Volcanic crater lakes
Complex volcanoes
Volcanoes of Gunma Prefecture
Kusatsu-Shirane
Stratovolcanoes of Japan
{{Gunma-geo-stub