Un vent de fissure, également connu sous le nom une fissure volcanique ou simplement la fissure, est une cheminée volcanique linéaire à travers laquelle lave éclate. -> Voir la description complète
Flores Island and Corvo Island to its north are located far west of the rest of the Azores islands and are the only two Azorean volcanoes lying west of the Mid-Atlantic Ridge. -> Voir la description complète
Fort Selkirk is a volcanic field near the junction of the Yukon and Pelly rivers in central Yukon. It is the northernmost young volcanic field in Canada.
The volcano consists of large valley-filling lava flows and 3 cinder cones.
The volcanic field developed at the intersection of two prominent fault lines, one running east-west, marked by the Pelly River and the lower Yukon River, and the other one NW-SE, defined by the upper Yukon River.
The first activity of the volcanic field were effusive, valley-filling eruptions of fluid basalt lava, followed by the construction of 3 cinder cones during strombolian-type eruptions and related emplacement of viscous aa lava flows. -> Voir la description complète
Les fossiles sont les vestiges conservés minéralisées ou autres ou des traces (telles que les empreintes) des animaux, des plantes et autres organismes. -> Voir la description complète
The Four Craters lava field, along with Devils Garden and Squaw Ridge, is the SE-most of a group of 3 basaltic lava fields SE of Newberry volcano in the High Lava Plains of central Oregon.
The Four Craters lava field contains 4 spatter cones along a 4-km-long NW-SE-trending line. The NW-most and highest cone has a well-preserved crater rim. The other 3 cones are breached to the west, SW, and south, respectively. The age of the Four Craters lava field is unknown, but probably similar to that of Squaw Ridge and Devils Garden, i.e. most likely about 10-20,000 years ago.
Le volcan Fueguino (Volcán Cook) est le volcan actif plus au sud des Andes de l'Amérique du Sud, située sur l'Isla Cook. Il est de 400 km loin de la plus proche autre volcan actif, Burney Monte au nord-ouest. Le volcan se compose de dômes de lave et des cônes de cendres. Une éruption strombolienne a été observée en 1820. -> Voir la description complète
Pleistocene and Holocene cinder cones and lava flows cover large portions of elongated Fuerteventura Island at the SE end of the Canary Islands. -> Voir la description complète
Fukue-jima volcano is a group of basaltic shield volcanoes and cinder cones on Fukue island off the western coast of Kyushu, Japan.
The volcanoes are 900,000 years old and last erupted about 2-3000 years ago. They are considered to be active.
The On-dake cinder cone forms the highest point of the volcanic field, which forms peninsulas at the eastern and SE tips of Fukue Island as well as several smaller islands SE of Fukue.
Fukujin volcano is one of the largest seamounts of the Marianas arc in Japan's Volcano Island chain. It sometimes has risen to above surface during eruptions creating temporary new islands. Water discoloration and floating pumice above the submarine volcano have been observed frequently.
Fukutoku-Okanoba is a submarine volcano 5 km NE of the small pyramidal island Minami-iwo-jima in the Japanese Volcano Island chain. Eruptions and submarine hydrothermal activity often cause water discoloration in the area, and during eruptions, the volcano has built several temporary new islands. The first observation of a new island was in 1904-05 when it formed Shin-Iwo-jima ("New Sulfur Island"). Small new islands were also formed during the eruptions in 1914 and 1986. -> Voir la description complète
Furnas volcano lies at the eastern end of Sao Miguel Island, immediately west of the older Nordeste shield volcano and its Povoaçao caldera. -> Voir la description complète
Fuss Peak is an isolated andesitic stratovolcano on southern Paramushir Island, Kuril Islands. The volcano rises almost 3000 m from the sea floor and forms a peninsula of Paramushir connected to it by a low isthmus.
The volcano contains a 700 m wide and 300 m deep crater, with a deep gully cutting its NW rim and forming a canyon down to the coast. Fresh-looking lava flows are on the E and SE flanks.
The last confirmed historic activity was in 1854.
Gagak belongs to the Perbakti-Gagak or Kiaraberes-Gagak volcanic complex near Bogor, immediately SW of Salak volcano.
Gunung Gagak lies to the NW of the group and is known for its large pumice and obsidian deposit at the summit, and obsidian lava flows extending to the north and NE.
Galeras is one of Colombia's most active volcanoes. In an eruption in 1993, it killed a group of scientists and tourists who had been inside its crater when it erupted. -> Voir la description complète
Galeras is one of Colombia's most active volcanoes. In an eruption in 1993, it killed a group of scientists and tourists who had been inside its crater when it erupted. -> Voir la description complète
Gallego volcano is a group of eroded cones covering a large part of the NW end of Guadalcanal Island. Mount Esperance, a small but well-preserved andesitic cone is said by to have been active less than 2000 years ago, according to local traditions. It is possible, however that these refer to eruptions of the younger Savo volcano.
Le volcan Galunggung environ 100 km capitale de SE de West Java Bandung a sa dernière éruption majeure en 1982, lorsque les cendres plumes atteint 20 km. -> Voir la description complète
Gamalama (pic de Ternate) est un stratovolcan conique quasi parfaite qui forme l'île entière de Ternate, au large de la côte ouest de Halmahera. Il est un des volcans les plus actifs en Indonésie. -> Voir la description complète
Garbuna volcano at the southern end of the Willaumez Peninsula, New Britain, is part of a basaltic-to-dacitic volcano group consisting of 3 volcanic peaks, Krummel, Garbuna, and Welcker.
Garbuna volcano erupted on 17 October 2005 after having been dormant for almost 1800 years. -> Voir la description complète
Mt Garibaldi volcano at the head of Howe Sound, 66 km north of Vancouver in SW British Columbia is probably Canada's best-known volcano and part of the active Cascades Range. It is a young stratovolcano capped by a complex of lava domes. Its most recent eruptions occurred at the Opal Cone on the SE flank ca. 8000 years ago and produced the Ring Creek lava flow. -> Voir la description complète
Garibaldi Lake is a group of 9 small small andesitic stratovolcanoes and basaltic-andesite cones located 70 km north of Vancouverin SW British Columbia, Canada. The most recent eruptions occurred from Clinker Peak probably around 10,000 years ago. -> Voir la description complète
Garove volcano forms the 12 km long and low Garove Island, the largest of the Witu Island group located 40 miles (65 km) north of New Britain Island in the Bismarck Sea.
Garove volcano has a 5 km wide flooded caldera open to the sea through a narrow breach on the southern side, where it forms Johann Albrecht harbour.
The island has fumarole fields and thermal areas. -> Voir la description complète
Garua (Talasea) volcano (or Garua Harbour volcano) is a volcanic field on the Willaumez Peninsula in New Britain, Papua New Guinea.
It has abundant geothermal activity with hot springs, large boiling pools, fumaroles, and small geysers, in particular along the shores of Garua Harbour and on the north shore near Pangalu village. Mudpots occur near Talasea on the south shore. -> Voir la description complète
Gaua est l’un des volcans en activité les plus éloigné au nord de l’archipel du Vanuatu. Son éruption la plus récente a commencée en septembre 2009 et est en cours depuis avril 2010 avec des émissions de cendre. -> Voir la description complète
Un magma étant un bain de silicates fondue avec des éléments chimiques présent sous forment dissoute et qui constituent la phase gazeuse du magma sous des conditions de pression et de température largement supérieur à celle de la surface (à l’air libre). -> Voir la description complète
The Ghegam Ridge, located in west-central Armenia between the capital city of Yerevan and Lake Sevan, contains a broad concentration of lava domes and pyroclastic cones of Pleistocene-to-Holocene age. -> Voir la description complète
Mt Giluwe is the highest volcano in Pacific Oceania and considered one of "the 7 volcanic summits" (not Mauna Kea on Hawaii, as many think: Giluwe is 162 m higher).
It is an ancient extinct shield volcano with 2 prominent 400 m high cones forming its summit, called the main peak and the slightly lower eastern peak (4300 m).
Occasionally, the summit receives snow fall. -> Voir la description complète
Glacier Peak is a stratovolcano in northern Washington and the most remote of the Cascade volcanoes. Its name comes from the 11 glaciers on its flanks.
Although it reaches more than 10,000 feet elevation, the volcanic edifice is only 500-1000 m high, because the volcano's base is located on a high ridge. -> Voir la description complète
Goat Rocks is the center a deeply eroded, glaciated volcanic center of a volcanic field 30 km (18 miles) north of Mount Adams, Washnington, USA. -> Voir la description complète
Le Golden Trout Creek champ volcanique constitué d'un groupe de cônes de scories et coulées de lave dans la vallée Toowa Toowa de la Sierra Nevada, en Californie, à environ 25 km au sud de Mount Whitney. Toowa vallée est une vallée large et ouvert environ 8600 pieds de haut, parsemé de cônes hausse 100-200 m au-dessus du fond de la vallée. 4 centres volcaniques ont été identifiés sur le terrain d'or du ruisseau Trout volcaniques. -> Voir la description complète
Golets and Tornyi are 2 pyroclastic cones located SW of Medvezhii on Iturup Island, Kurile Islands, Russia. They occupy one of the narrowest parts of the island.
The age of their last eruptions is unknown, but probably about 10,000 years ago. A lava flow from the andesitic-dacitic Tornyi cone (417 m) is seen inside a glacial depression.
Golets cone itself was constructed above the eroded remnants of the extinct Parusnaya Mountain volcano. Lava flows from Golets reached the coast.
(Source: GVP / Smithsonian volcano information)
Göllü Dağ, a 2143-m-high rhyolitic-to-rhyodacitic lava dome complex in central Anatolia, lies between the Hasan Dağ and Acigöl-Nevsehir volcanic complexes. -> Voir la description complète
Golovnin volcano (Tomari-yama in Japanese) is the southernmost volcano in the Kurile Islands and forms the southern end of Kunashir Island, located only 33 km across the Nemuro Strait from Hokkaido Island in Japan.
It has a 4x5 km wide caldera with an 1x2.5 km wide lake, active solfataric areas at the northern lake shore and several explosion craters, one of which contains a hot crater lake with reported temperatures ranging between 36-100 degrees C. The lake drains through a narrow gap in the western caldera wall. It is part of a protected reserve and swimming in the lake is prohibited.
The only known historical eruption of Golovnin volcano consisted in a minor explosion in 1848. -> Voir la description complète
Goodenough (Nidula) Island is a roughly circular volcanic island with 26 km diameter and the westernmost of the D'Entrecasteaux Islands off the NE end of New Guinea. Goodenough volcano contains several young basaltic-andesite and andesitic eruptive centers which may only be a few hundred years old.
At present, there are thermal areas and hot springs in several areas, including 1.5 km north-west of Nou Nou, south-west of Wakala Hill, on the coast east of Bolu Bolu, and 3 km north of Bolu Bolu.
Goodenough Island with its very steep cliffs might be one of the steepest islands in the world. -> Voir la description complète
Gorely volcano is one of the most active volcanoes in southern Kamchatka and located 75 km SW of Petropavlovsk. It is a complex of several overlapping stratovolcanoes with many summit and flank craters. Activity in historic times were mainly small to medium-sized ash and steam eruptions. -> Voir la description complète
Goriaschaia Sopka (also spelled Goriaschaya Sopka) is a frequently active volcano on SW Simushir Island, Kurile Islands.
Its active vent is an andesitic lava dome volcano within a large horseshoe-shaped crater cutting the NW flank of what is left of the older Igla Mountain volcano (a somma). Igla Mountain is very close to Milne volcano.
The Sopka dome is probably only about 150 years old. It has erupted many young lava flows with prominent marginal levees. Some of them reached the sea where they created an irregular shoreline.
Observed historical activity were mainly mild to moderate ash explosions and strombolian.
The SE end of Graciosa, the northernmost of the central Azorean islands, contains a small 0.9 x 1.6 km caldera with active fumaroles. -> Voir la description complète
The largely Miocene-to-Pliocene island of Gran Canaria in the middle of the Canary archipelago has been strongly eroded into steep-walled radial gorges called barrancos. -> Voir la description complète
Granada volcano is a system of N-S trending fissure vents, cinder cones and craters located in western Nicaragua between the city of Granada (the oldest city founded by Europeans on the American continent) on the northwestern shore of Lake Nicaragua and the northern flanks of Mombacho volcano.
The earliest eruptions were dated to about 12,000 years ago and the latest activity could be as recent as 2000 years.
A prominent feature is the La Joya explosions craters SW of Granada town. Current activity is limited to hot springs and areas of hot ground at the western shore of Laguna Apoyo, but future eruptions are possible and pose a significant hazard to Granada town. -> Voir la description complète
Littéralement, la « grotte de glace-» la Grotta del Gelo est le plus célèbre et un de la lave plus éloignée des grottes sur le volcan Etna. Il est rempli en permanence avec un petit glacier - le glacier plus au sud en Europe !
Grozny volcano (Etorofu Yake-yama in Japanese) in central Iturup Island, Kuriles is one of the most frequently active volcanoes of the volcanic island chain.
It is a complex of 2 volcanoes: Ivan Grozny volcano and Tebenkov (also known as Odamoi-san) volcano.
Ivan Grozny volcano has a 3-3.5 km diameter caldera open to the south and includes the andesitic Grozny lava dome, whose name is also used for the whole complex. All known historic eruptions took place from Ivan Grozny volcano. -> Voir la description complète
Guadalupe volcano is a mostly submerged volcano that forms the island of the same name 250 km west off the coast of Baja California. The volcano was built on the old axis of an ancient spreading center and consists of 2 overlapping shields, the southern of which is the older.
The younger northern volcano could still be active and has probably erupted during the Holocene. -> Voir la description complète
Guagua Pichincha is one of Ecuador's most active volcanoes. The stratovolcano is part of a complex that rises immediately west of the capital Quito, at only 8 km distance from the city center. 3 major explosive eruptions have occurred at Guagua Pichincha in the past 2000 years, the most recent one in 1660. An event of similar size today is a major threat to the ca. 2 million city of Quito.
The volcano and the older extinct Rucu Pichincha stratovolcano form a broad volcanic massif 23 km in diameter. Historical activity of the volcano has included large explosive eruptions some of which produced sub-plinian and plinian eruption columns, lava domes. Guagua Pichincha volcano's eruptions frequently produce dangerous pyroclastic flows.
Following a 100 year long interval of being dormant, Guagua Pichincha volcano has entered a new phase of low seismic, phreatic and magmatic activity in 1981. -> Voir la description complète
