is a

volcanic group A volcanic group is a stratigraphic group consisting of volcanic strata. They can be in the form of volcanic fields, volcanic complexes and cone A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequ ...

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 ...

es and

lava dome In volcanology, a lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions on ...

s located in

Nagano Prefecture is a landlocked prefecture of Japan located in the Chūbu region of Honshū. Nagano Prefecture has a population of 2,052,493 () and has a geographic area of . Nagano Prefecture borders Niigata Prefecture to the north, Gunma Prefecture to the ...

Honshū , historically called , is the largest and most populous island of Japan. It is located south of Hokkaidō across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyūshū across the Kanmon Straits. The island separa ...

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 ...

Description

The Northern Yatsugatake Volcanic Group is part of the

Yatsugatake Mountains The are a volcanic mountain range on the border between Nagano Prefecture and Yamanashi Prefecture on the island of Honshū in Japan. Description The mountain range consists of two volcanic groups, Northern Yatsugatake Volcanic Group and Southe ...

. The northern group is defined as the mountains from Mount Futago to Natsuzawa Pass. The highest peak of the mountains is

Mount Tengu is a 2,646m mountain on the border of Chino and Koumi of Nagano in Japan. This mountain is the highest mountains of Northern Yatsugatake Volcanic Group. Named for the mythical avian creatures of Japanese folklore, the Tengu. Description Mo ...

and the elevation is 2,646 metres. The southern Yatsugatake mountains are steep and have alpine characteristics. The mountains of the Northern Yatsugatake Volcanic Group are gentler and lower. Yatsugatake is listed among the 100 famous mountains in Japan, but this refers to the

Southern Yatsugatake Volcanic Group , also known as just Yatsugatake is a volcanic group of inactive volcanoes located on the border of Nagano Prefecture and Yamanashi Prefecture on Honshū in Japan. Description The Southern Yatsugatake Volcanic Group is part of the Yatsugatake Mo ...

Mount Tateshina also Suwa Fuji is a complex volcano located on the border of the municipalities of Chino and Tateshina in Nagano Prefecture, Japan. It has an elevation of . This mountain is one of the 100 Famous Japanese Mountains. Outline Mount Tateshi ...

is also mentioned as one of the 100 famous mountains, and it is part of the Northern Yatsugatake mountains, but is listed separately. These mountains are part of the

Yatsugatake-Chūshin Kōgen Quasi-National Park is a quasi-national park on Honshū in Japan. It is rated a protected landscape (category V) according to the IUCN. The park includes the Yatsugatake Mountains and the surrounding lava plateaus: Tateshina plateau, Kirigamine, and Utsukushigahara. ...

Geology and volcanic activity

The volcanoes are stratovolcanos that are 1 million to 200,000 years old. The rock is mainly

basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...

dacite Dacite () is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. ...

, and

andesite Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predomi ...

. Mount Yoko has shown the most recent activity and is now considered an active volcano. It last erupted about 800 years ago. In 888 a debris avalanche on the East side of the volcanic massif caused

Lake Matsubara A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

to form. The Tateshina-kogen plateau was formed by a large lava flow.

List of peaks

The following peaks, from North to South, make up the Northern Yatsugatake Volcanic Group: * Mount Futago,

cinder cone A cinder cone (or scoria cone) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. The pyroclastic fragments are formed by explosive eruptions o ...

(Also known as Suwa Fuji),

* Mount Yoko (Also known at Mount Kita Yoko.),

* Mount Shimagare,

* Mount Chausu,

* Mount Maru *

Nyu New York University (NYU) is a private university, private research university in New York City. Chartered in 1831 by the New York State Legislature, NYU was founded by a group of New Yorkers led by then-United States Secretary of the Treasu ...

* Mount Naka *

Mount Neishi {{nihongo, Mount Neishi, 根石岳, Neishi-dake is a 2,603m mountain on the border of Chino and Koumi of Nagano in Japan. This mountain belongs to Northern Yatsugatake Volcanic Group. Description Mount Neishi is a stratovolcano. This mountain ...

References

Welcome to Yatsugatake

Official Home Page of the Geographical Survey Institute in Japan
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Gallery

Image:Yatsugatake1.jpg, Mount Higashi-Tengu, the highest peak of the Kita-Yatsugatake Mountains Image:Yatsugatake3.jpg, Mount Tateshina from Lake Shirakaba Volcanoes of Yamanashi Prefecture Volcanoes of Nagano Prefecture Volcanoes of Honshū Volcanic groups Complex volcanoes

Description

Geology and volcanic activity

List of peaks

See also

References

Gallery