Northern Yatsugatake Volcanic Group
Encyclopedia
, also just Kita Yatsugatake is a volcanic group
of stratovolcano
es and lava dome
s located in Nagano Prefecture
on Honshū
in Japan
.
. The northern group is defined as the mountains from Mount Futago
to Natsuzawa Pass. The highest peak of the mountains is Mount Tengu
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. Mount Tateshina
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
.
, dacite
, and andesite
. 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 to form. The Tateshina-kogen plateau was formed by a large lava flow.
Volcanic group
A volcanic group is a collection of related volcanoes or volcanic landforms. Note that the term is also used in a different sense when it denotes a suite of associated rock strata largely of volcanic origin; see group for details.-Notable volcanic groups:-See also:*Complex...
of stratovolcano
Stratovolcano
A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...
es and lava dome
Lava dome
|250px|thumb|right|Image of the [[rhyolitic]] lava dome of [[Chaitén Volcano]] during its 2008–2009 eruption.In volcanology, a lava dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano...
s located in Nagano Prefecture
Nagano Prefecture
is a prefecture of Japan located in the Chūbu region of the island of Honshū. The capital is the city of Nagano.- History :Nagano was formerly known as the province of Shinano...
on Honshū
Honshu
is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...
in Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
.
Description
The Northern Yatsugatake Volcanic Group is part of the Yatsugatake MountainsYatsugatake Mountains
The Yatsugatake Mountains are a volcanic mountain range on the border between Nagano Prefecture and Yamanashi Prefecture on the island of Honshū in Japan.-Description:...
. The northern group is defined as the mountains from Mount Futago
Mount Futago
Mount Futago is a small mountain with two peaks, the northern one being 240 m and the southern one 245 m, in the northern part of Langhovde Hills, Queen Maud Land. Mapped from surveys and air photos by Japanese Antarctic Research Expedition , 1957-62. The name Futago-yama , meaning "twin...
to Natsuzawa Pass. The highest peak of the mountains is Mount Tengu
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.- Description:...
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. Mount Tateshina
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:...
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
Yatsugatake-Chushin Kogen Quasi-National Park
is a quasi-national park on Honshū in Japan. It is rated a protected landscape according to the IUCN. The park includes the Yatsugatake Mountains and the surrounding lava plateaus: Tateshina plateau, Kirigamine, and Utsukushigahara. It straddles the border between Nagano and Yamanashi prefectures....
.
Geology and volcanic activity
The volcanoes are stratovolcanos that are 1 million to 200,000 years old. The rock is mainly basaltBasalt
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...
, dacite
Dacite
Dacite is an igneous, volcanic rock. It has an aphanitic to porphyritic texture and is intermediate in composition between andesite and rhyolite. The relative proportions of feldspars and quartz in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram...
, and andesite
Andesite
Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite,...
. 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 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 coneCinder coneAccording to the , Cinder Cone is the proper name of 1 cinder cone in Canada and 7 cinder cones in the United States:In Canada: Cinder Cone In the United States:...
- Mount TateshinaMount Tateshinaalso 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:...
(Also known as Suwa Fuji.), stratovolcanoStratovolcanoA stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions... - Mount YokoMount Yoko (Northern Yatsugatake)also Mount Kita Yoko, is an active lava dome located in the Northern Yatsugatake Volcanic Group of the Yatsugatake Mountains, Honshū, Japan. Mount Yoko has shown the most recent activity and is now considered an active volcano. It last erupted about 800 years ago. The eruption consisted of ash with...
(Also known at Mount Kita Yoko.), lava domeLava dome|250px|thumb|right|Image of the [[rhyolitic]] lava dome of [[Chaitén Volcano]] during its 2008–2009 eruption.In volcanology, a lava dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano... - Mount Shimagare, lava domeLava dome|250px|thumb|right|Image of the [[rhyolitic]] lava dome of [[Chaitén Volcano]] during its 2008–2009 eruption.In volcanology, a lava dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano...
- Mount Chausu, lava domeLava dome|250px|thumb|right|Image of the [[rhyolitic]] lava dome of [[Chaitén Volcano]] during its 2008–2009 eruption.In volcanology, a lava dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano...
- Mount Maru
- NyuMount Nyuis a stratovolcano of the Northern Yatsugatake Volcanic Group in Koumi, Nagano Prefecture, Japan. This mountain is part of the Yatsugatake-Chūshin Kōgen Quasi-National Park.-Climbing route:...
- Mount Naka
- Mount TenguMount Tenguis 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.- Description:...
- Mount NeishiMount Neishiis 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 is a part of the Yatsugatake-Chūshin Kōgen Quasi-National Park....