Mount Maru (Kamishihoro-Shintoku)

Mount Maru
丸山
Elevation	1,692.1 m (5,552 ft) [1]
Prominence	421 m (1,381 ft) [1]
Parent peak	Mount Nipesotsu
Listing	List of mountains and hills of Japan by height List of volcanoes by elevation
Translation	round mountain (Japanese)
Location
Location	Hokkaido, Japan
Range	Nipesotsu-Maruyama Volcanic Group
Coordinates	43°25′3″N 143°1′51″E / 43.4175°N 143.03083°E / 43.4175; 143.03083Coordinates: 43°25′3″N 143°1′51″E / 43.4175°N 143.03083°E / 43.4175; 143.03083
Topo map	Geospatial Information Authority 25000:1 ニペソツ山 25000:1 ウペペサンケ山 50000:1 糠平
Geology
Type	lava dome
Age of rock	Quaternary
Volcanic arc/belt	Kurile arc
Last eruption	1898

Mount Maru (丸山, Maru-yama^?) is a lava dome located in the Nipesotsu-Maruyama Volcanic Group of the Ishikari Mountains, Hokkaidō, Japan. Mount Maru is also known as Higashi-Tokachi-Maruyama (東十勝丸山^?)^[2] or Higashi-Taisetsu-Maruyama (東大雪丸山^?)^[3] to distinguish it from other mountains with the same name. Only in 1989 did scientists discover that Mount Maru is a quaternary volcano.^[2] The mountain sits on the border between the towns of Kamishihoro and Shintoku.^[1]

Geology

The western flank of the mountain shows accretionary complex from the late Eocene to the early Miocene. The eastern flank shows non-alkaline mafic volcanic rock from the early to middle Miocene. The mountain is topped with non-alkaline mafic rock from the middle Pleistocene.^[4]

Eruptive history

Other than fumaroles, the last eruption of Mount Maru, according to historical records, was from approximately December 3, 1898 to December 6. Before that the last eruption was approximately 1700 BC.^[2]

References

1. ^ ^{a b c} Geospatial Information Authority topographic map ウペペサンケ山
2. ^ ^{a b c} "Nipesotsu-Maruyama". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=0805-061. Retrieved 2010-04-30. 
3. ^ "HIGASHI-TAISETSU MARU-YAMA". Quaternary Volcanoes in Japan. Geological Survey of Japan, AIST. http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/vol/216b.htm. Retrieved 30 April 2010. 
4. ^ "Hokkaido". Seamless digital geological map of Japan 1: 200,000. Geological Survey of Japan, AIST. Feb. 18, 2010. http://riodb02.ibase.aist.go.jp/db084/kihon/hokkaido_e.xml. Retrieved 30 April 2010.