is an

active Active may refer to: Music * ''Active'' (album), a 1992 album by Casiopea * "Active" (song), a 2024 song by Asake and Travis Scott from Asake's album ''Lungu Boy'' * Active Records, a record label Ships * ''Active'' (ship), several com ...

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

Honshu , historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the list of islands by area, seventh-largest island in the world, and the list of islands by ...

, Japan. It is situated at the southwest of Myōkō city,

Niigata Prefecture is a Prefectures of Japan, prefecture in the Chūbu region of Honshu of Japan. Niigata Prefecture has a population of 2,131,009 (1 July 2023) and is the List of Japanese prefectures by area, fifth-largest prefecture of Japan by geographic area ...

, and a part of

Jōshin'etsu-kōgen National Park is a national park in the Chūbu region of the main island of Honshū, Japan formed around several active and dormant volcanoes. It spans the mountainous areas of Gunma Prefecture, Gunma, Nagano Prefecture, Nagano, and Niigata Prefecture, Niiga ...

. Mount Myōkō is listed as one of

100 Famous Japanese Mountains is a book written in 1964 by Mountaineering, mountaineer and author Kyūya Fukada.Hyakumeizan, Hiking Japan ...

, and together with , it is well known as the "famous mountain" of Niigata Prefecture.

Name

is another name given to this mountain. Being close to the border with

Nagano Prefecture is a Landlocked country, landlocked Prefectures of Japan, prefecture of Japan located in the Chūbu region of Honshu. Nagano Prefecture has a population of 2,007,682 () and has a geographic area of . Nagano Prefecture borders Niigata Prefecture ...

, it is linked to those on the Nagano side as one of the . The mountain was originally named but was later changed to . This can be also written as 妙高山, in order to make use of two "lucky" characters.

Geology and geography

Mount Myōkō was formed beginning about 300,000 years ago, in a series of eruptions producing a broad spectrum of lava types including

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 ...

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 predomina ...

, and

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. ...

. Its maximum height is estimated to have been between and , but it presently reaches only . Around 19,000 years ago, the top was blown off in a major

eruption A volcanic eruption occurs when material is expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has ...

, forming a wide

caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. An eruption that ejects large volumes of magma over a short period of time can cause significant detriment to the str ...

. About 6,000 years ago, the central crater developed and assumed its present shape. A

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 ...

forms the volcano's present summit. The most recent eruptions about 4,300 years ago produced

pyroclastic flow A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano at average speeds of b ...

s down the eastern flanks. Present activity is solfataric from

fumarole A fumarole (or fumerole) is a vent in the surface of the Earth or another rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

s near the lava dome where

sulfur Sulfur ( American spelling and the preferred IUPAC name) or sulphur ( Commonwealth spelling) is a chemical element; it has symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms ...

was once mined. There are

onsen In Japan, are hot springs and the bathing facilities and Ryokan (inn), traditional inns around them. There are approximately 25,000 hot spring sources throughout Japan, and approximately 3,000 ''onsen'' establishments use naturally hot water ...

and

ski resort A ski resort is a resort developed for skiing, snowboarding, and other winter sports. In Europe, most ski resorts are towns or villages in or adjacent to a ski area–a mountainous area with pistes (ski trails) and a ski lift system. In North Am ...

s at the foot of the mountain, including Akakura, Suginohara and Ikenotaira.

Related facts

The

heavy cruiser A heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treat ...

'' Myōkō'' of the

Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...

and an

Aegis The aegis ( ; ''aigís''), as stated in the ''Iliad'', is a device carried by Athena and Zeus, variously interpreted as an animal skin or a shield and sometimes featuring the head of a Gorgon. There may be a connection with a deity named Aex, a ...

destroyer In naval terminology, a destroyer is a fast, maneuverable, long-endurance warship intended to escort larger vessels in a fleet, convoy, or carrier battle group and defend them against a wide range of general threats. They were conceived i ...

of the

Japan Maritime Self-Defense Force The , abbreviated , also simply known as the Japanese Navy, is the maritime warfare branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The JMSDF was formed following the dissolution of the Imperial Japanese Navy ( ...

are named after this mountain. The JR East train service '' Myōkō'' is also named after the mountain. The mountain appears invariably in school songs of elementary and middle schools in the

Jōetsu Region is a geographical region within Niigata Prefecture, Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends ...

. In 1990 the Nippon Jamboree, a camping festival, was held on the during which the participants climbed the mountain.

References

External links

Myokosan
- Japan Meteorological Agency * - Japan Meteorological Agency

- Geological Survey of Japan * {{DEFAULTSORT:Myoko, Mount Mountains of Niigata Prefecture Stratovolcanoes of Japan Volcanoes of Honshū Volcanoes of Niigata Prefecture Myōkō, Niigata Pleistocene stratovolcanoes Holocene stratovolcanoes

Name

Geology and geography

Related facts

See also

References

External links