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Bandai (Volcano)

Bandai volcano (Bandai-san), one of Japan's most known active volcanoes, is an complex andesitic stratovolcano rising above the north shore of Lake Inawashiro. The volcano is located in the southern part of the NE Honshu volcanic arc. The last magma was erupted at Bandai about 25,000 years ago, but during the past 5000 years, 4 major phreatic explosions have occurred at the volcano. 2 of them occurred in historical time, in 806 and 1888. In 1888, the youngest edifice of Bandai, Ko-Bandai, collapsed in a catastrophic way after a large phreatic eruption, producing a debris avalanche that buried several villages and formed several large lakes. Seen from the south, Bandai presents a conical profile, but much of the north side of the volcano is missing as a result of the collapse of Ko-Bandai volcano during the 1888 eruption. -> See whole entry

Banua Wuhu (Volcano)

Banua Wuhu is a submarine volcano in the Sangihe Islands, Indonesia, 45 km south of Awu. The volcano rises more than 400 m from the sea floor and almost reaches the surface, forming a shallow shoal at 5 m depth. Banua Wuhu, during some of its eruptions, has created temporary islands, which were eroded subsequently by wave action. Adjacent Mahengetang island belongs to the same volcanic edifice. Separate vents are found to the northeast (Kahakitang) and north (Kalama) of Banua Wuhu. -> See whole entry

Baransky (Volcano)

Baransky volcano (Sashiusu-dake in Japanese) is a stratovolcano in the center of Iturup Island, southern Kuriles. Only one historical eruption occurred in 1951 and consisted of weak explosions in the summit crater. Strong fumarolic activity is in the summit and several flank craters. A geothermal field is found on the SW flank and contains hot springs and geysers. During a geothermal exploration in 1992 in this field, a small hydrothermal explosion took place inside an exploratory well and the exploration was abandoned. -> See whole entry

Bárcena (Volcano)

Barcena volcano forms the southern part and most significant feature of Isla San Benedicto, the 3rd largest and north-easternmost of the 4 Islas Revillagigedo islands about 350 km south of Cabo San Lucas, Baja California. The volcano formed by eruptions during 1952-53 and consists in a 700 m wide and 330 m high tuff cone with a circular crater and a spectacular lava delta on the east side formed by a trachytic lava flow that breached the crater and entered the sea. The eruption was the first historic eruption witnessed in the eastern Pacific Ocean. -> See whole entry

Bárdarbunga (Volcano)

Bárdarbunga, a large central volcano, had its last major eruption in 1477 when it produced a large ash and pumice fall-out deposit. It also produced the largest known lava flow during the past 10,000 years on earth (more than 21 cubic kilometers of volume). -> See whole entry

Barren Island (Volcano)

Baru (Volcano)

Barú volcano (also called Volcán de Chiriqui) is an active volcano 35 km east of the border to Costa Rica in the Talamanca Range of western in Panama. The complex, mainly andesitic stratovolcano is Panama´s highest peak. A large explosive eruption occurred at about 700 AD destroyed settlements around the volcano. Excavations at the Cerro Punta archaeological site NW of the volcano have brought back to life their ruins. The only historical eruption of Barú was an explosive eruption reported from the mid 16th century, but radiocarbon-dated tephra samples suggest that there was some activity less than 500 years ago. Volcán Barú is the youngest major volcano in Panamá and there are geothermal exploration projects under way. -> See whole entry

Bas Dong Nai (Volcano)

Bas Dong Nai volcano (also known as the Xuan Loc Plateau) is a volcanic field in SE Vietnam, east of Ho Chi Minh city (Saigon). It could be less than 10,000 years old and is the southernmost volcanic area in mainland Vietnam. Suzanna Mount is a well-preserved 180 m high basaltic cone of prehistoric age.

basalt (Volcanology)

The most common type of volcanic rock, with a relatively low silica content and typically erupted at shield volcanoes. -> See whole entry

base surge (Volcanology)

Batu Tara (Volcano)

Batur (Volcano)

Batur is the most active volcano on the popular tourist island of Bali and one of Inondesia's more active ones. During the past centuries, Batur has had a number of small eruptions every few years. Thanks to the scenic beauty of the caldera with its lake and the cone of Batur, it is one of Bali's most popular destinations. -> See whole entry

Bayonnaise Rocks (Volcano)

Bayonnaise Rocks volcano (ベヨネース列岩 Beyonēsu-retsugan) is an active submarine volcano in the Izu Islands ca. 400 km south of Tokyo. The volcano has a large 8-9 km wide caldera whose highest point forms a few rocks rising just above sea level. The volcano is known for its submarine eruptions which sometimes produce temporary islands. Most of its frequent eruptions have occurred at Myojin-sho, a large young lava dome on the NE rim of the caldera. In 1952, an explosive eruption at Myojin-sho destroyed a Japanese research vessel, killing all 31 people on board. There is only sparse vegetation on the Bayonnaise Rocks, but the islands are an important resting place for migratory birds. Located in the Kuroshio Current, the waters around have abundant sea life and are popular with sports fishermen. -> See whole entry

Bazman (Volcano)

Bazman volcano is a stratovolcano in SE Iran, 180 km SSW of the city of Zahedan. The volcano has a well-preserved 500 m wide summit crater with minor fumaroles, which suggest it could be still active. -> See whole entry

Belirang-Beriti (Volcano)

The compound Belerang-Beriti volcano rises above the Semalako Plain in SW Sumatra, forming a NW-SE-trending massif that contains a 1.2-km-wide crater breached to the NE. -> See whole entry

Belknap (Volcano)

Belknap Crater volcano is located near McKenzie Pass, north of the Three Sisters volcanoes in Central Oregon. It is the center and source of one of the largest number of geologically recent eruptions in the Cascade Range. It was very active between about 3000 and 1500 years ago. The McKenzie highway 242 crosses the barren lava fields on the SE flank and offers with spectacular views toward Mt. Jefferson and the Three Sisters volcanoes. -> See whole entry

bentonite (Minerals)

Bentonite is an absorbent aluminium phyllosilicate generally impure clay consisting mostly of montmorillonite. -> See whole entry

Berutarube (Volcano)

Berutarube is an andesitic-to-dacitic stratovolcano on the SW tip of Iturup Island (Kuriles). It has gentle slopes which are deeply eroded by glacial valleys. Funaroles and sufur deposits occur in the inner walls of the central crater. -> See whole entry

Besar (Volcano)

Gunung Besar is a 1899-m-high volcano in SE Sumatra with a minor sulfur deposit in its crater. -> See whole entry

Bezymianny (Volcano)

Bezymianny ("unnamed") was considered extinct until it erupted violently in 1955-56, after a slumber of probably 1000 years. It is one of the most active volcanoes in Kamchatka. The eruption followed a massive flank failure (similar to Mt. St. Helens eruption in 1980) which removed a 0.5 sq km sector of the volcano. -> See whole entry

Bibinoi (Volcano)

Bibinoi volcano (Bukit Bibinoi, Bibinoi Hill) on the SE tip of Bacan Island is the largest and SE most of 3 volcanoes on the island, located off the south coast of Halmahera Island, Indonesia. Two other, smaller volcanic centres are Songsu and Lansa. Binibnoi is separated from the Amasing volcanic complex to the NW by the metamorphic (i.e. non volcanic) Sibela Mountain range.

Bichbalick Synonym of: Pechan (Volcano)

Biliran (Volcano)

Biliran volcano comprises the whole 20x35 km Island of Biliran which is formed by a group of lava domes. It is located across the narrow Biliran Strait from the northern tip of Leyte Island. Biliran volcano is at the northern end of a 170 km long volcanic chain extending SSE to Panaon Island. The only known historic activity took place on 26 September 1939 and consisted of a phreatic explosion accompanied possibly by a debris avalanche. Ash fell in Caibiran town 12 km to the E. There are many fumarole fields, hot springs, mud pools and thermal areas on Biliran.

Billy Mitchell (Volcano)

Billy Mitchell volcano is a small shield volcano, which is composed mainly of loose deposits from explosive eruptions (pyroclastic shield). The volcano is located immediately NE of Bagana volcano in central Bougainville Island. Billy Mitchell's typical eruption style are explosive eruptions from the central vent, and the volcano is remarkable for having produced some of the largest explosive eruptions in Papua New Guinea in the past 10,000 years. -> See whole entry

Binuluan (Volcano)

Binuluan volcano belongs to the Ambalatungan volcanic group and is located in the Kalinga Province, Luzon Island, Philippines. A possible steam eruption of Binuluan volcano in 1952 killed 12 people by a sulphur rich debris flow.

Bir Borhut (Volcano)

Bir Borhut volcano is an active, but almost unknown volcano in eastern Yemen near the Gulf of Aden. Old documents tell of volcanic activity in the 10th century, and it was reported to have still been "smoking" in 1813. -> See whole entry

Black Rock Desert (Volcano)

The Black Rock Desert volcanic field of a group of small volcanic fields in south central Utah, at the eastern margin of the Great Basin. It is the youngest volcanic area in Utah and contains both Utah's youngest known rhyolite dome (0.4 million years old) and its youngest lava flows, the roughly 660-year-old Ice Springs lava flows, located at Ice Springs, 15 km west of Meadow. These lava flows extend 4 km north and west from Black Rock Station. -> See whole entry

block (Volcanology: (volcanic) block)

Volcanic blocks are solidified rock fragments greater than 64 mm in diameter. Blocks commonly are ejected during explosive eruptions and consist of older pieces of the volcano's edifice, e.g. parts of the conduit, lava domes or older lava flows. -> See whole entry

Blue Lake Crater (Volcano)

Blue Lake is a series of at least 3 overlapping explosion craters (maars), located along a NE trend slightly east of the crest of the Cascade Range. The best-known crater, Blue Lake Crater contains a blue lake (800m x 300m) and is probably the youngest. It formed by an eruption about 1300 years ago. It lies immediately west of the popular recreation area of Suttle Lake. -> See whole entry

Blup Blup (Volcano)

Blup Blup volcano forms the small, forested 3.5 km wide Blup Blup Island ca. 30 km offshore from Cape Girgir on the East Sepik coastline of New Guinea. The closest town is Karau. The andesitic-dacitic volcano contains a 800 m diameter summit crater filled by thick rainforest, and possibly a lava dome on a ridge extending to the west. Lava flows with well-developed flow fronts are visible on its flanks. A small flank cone is located on the SW coast. Most activity took place from the summit crater, but the age of the last eruption is unknown, but probably less than 10,000 years ago.

Bocca Nuova (Volcano)

Bocca Nuova (= the New Mouth) is the westernmost summit crater of Etna volcano. It formed in 1968 as a small pit crater on the summit crater cone. It gradually increased in size and depth over the years. The last major eruption from Bocca Nuova occured in 1999, when lava filled the crater and overspilled onto the western flank of Mt. Etna.

Bogatyr Ridge (Volcano)

Bogatyr Ridge is a stratovolcano on SW Iturup Island, Kuriles, Russia. It consists of a chain of craters and cones and the larger Stokap volcano, astratovolcano aligned NE-SW. The andesitic Stokap volcano has 8-10 cones and explosion craters. The largest of these contains a lake. Lava flows from Stokap volcano have reached the sea on both sides, the Pacific Ocean and the Sea of Okhotsk. There are no known historic eruptions, but the volcano has been active during the Holocene. --- Source: GVP Bogatyr Ridge information

Boisa (Volcano)

Boisa volcano forms a tiny island offshore from Bogia on the Madang coast. There are no known historical eruptions from Boisa volcano. It is located only 10 km NW of Manam volcano, and it is a possible that Boisa belongs to the same volcanic edifice and is supplied by the same magma chamber,- in other words, really is a side vent of Manam rather than a separate volcano. -> See whole entry

Bola (Volcano)

Bola volcano (or Mt. Wangore) is a symmetrical steep stratovolcano that forms the highest point on the Willaumez Peninsula in New Britain. There are no known recent eruptions, but the fresh morphology of the summit crater suggests that the last activity was only a few hundred years ago. -> See whole entry

bomb (Volcanology: volcanic bomb)

Ejected fragments of fresh magma larger than 64 mm in diameter, often shaped aerodynamically during their flight. -> See whole entry

Bombalai (Volcano)

Bombalai volcano in north east Borneo is the only volcano considered still possibly active of Malaysia, although its last eruptions might have been thousands of years ago. It is located close to the border with Indonesia, in the Malaysian province of Sabah, across Cowie Harbor from the the Indonesian province of Kalimantan. Bombalai cinder cone is part of a large volcanic field on the Semporna Peninsula in the NE of Borneo. Bombalai has a 300 m wide crater breached to the south and 2 young lava flows extending almost to the coast.

Bosavi (Volcano)

Mount Bosavi is an extinct volcano in a remote part of the Highlands of Papua New Guinea. Mount Bosavi is actually the collapsed cone of an extinct volcano on the Great Papuan Plateau, part of the Kikori River basin. Its caldera is approximately 4 km wide and 1 km deep. Bosavi is home to a number of unique species. The volcano is partly located in the Sulamesi Wildlife Management Area, which was declared in 2006. The mountain with its deep crater are so inaccessible that even the few local people in the Kasua tribe who live in nearby villages rarely visit the area. -> See whole entry

Boschan Synonym of: Pechan (Volcano)

Bratan (Volcano)

Bratan is a large caldera of unknown age in north-central Bali, Indonesia. It measures 11 x 6 km and contains 3 lakes - Danau Tamblimgam, Danau Buyan, and Danau Bratan. The area is know of its scenic beauty and hot springs. -> See whole entry

breadcrust bomb (Volcanology)

Volcanic bomb with a cracked surface, similar to bread, caused by the slow expansion of the interior gas bubbles while cooling. -> See whole entry

Brennisteinsfjöll volcano (Volcano)

Bridge River Cones (Volcano)

The Bridge River Cones are a field of small basaltic cinder cones in SW British Columbia, Canda. The youngest activity from this volcanic area could be less than 1500 years old. -> See whole entry

Broken Top (Volcano)

Broken Top in the Three Sisters Wilderness, Oregon, is, as the name suggests, the heavily eroded top of a probably extinct stratovolcano. -> See whole entry

Bromo (Volcano)

Mt. Bromo volcano in East Java is the active cone inside the giant Tengger caldera, one of Indonesia's most scenic locations destination in East Java, famous for its magnificient sunrise views and the panorama over the caldera with Semeru volcano in the background. -> See whole entry

Brushy Butte (Volcano)

Brushy Butte is a small, poorly studied shield volcano immediately east of Timbered Crater maar, and south-southeast of the Medicine Lake Highlands in northern California, USA.

Bukit Daun (Volcano)

Located in a sparsely populated region of Sumatra, Bukit Daun forms a twin volcano with Gedang volcano. -> See whole entry

Bukit Lumut Balai (Volcano)

Bukit Lumut Balai is a heavily eroded volcano consisting of three eruption centers, two on Bukit Lumut and one on the NE side of Bukit Balai, 5 km to the east. Large lava flows occur on the north side of Bukit Balai. -> See whole entry

Bulusan (Volcano)

Bulusan, one of the most active volcanoes in the Philippines, is Luzon's southernmost volcano. It lies at the SE end of the Bicol volcanic arc occupying the peninsula of the same name that forms the elongated SE tip of Luzon island. -> See whole entry

Buru (Volcano)

Buru volcano is a partly preserved cinder cone which rises 250 m above the surrounding swamps. it is located SW of Pago and SE of Oto. The volcano is named after the Buru river on the south side of the volcano. To the north is a swampy depression called the Buru caldera. -> See whole entry

Cabalian (Volcano)

Mount Cabalían volcano is located on the SE tip of Leyte Island, Philippines. It is is an andesitic stratovolcano with steep radial erosion valleys and ridges that are moderately to thickly vegetated. It contains a summit crater filled by a lake. The crater rim is irregular and forms 2 peaks on the S side. A recent pyroclastic flow deposit was radiocarbon dated to be only about 150 years old. Hot springs with temperatures of up to 64 deg C are found on the east and west flanks of Cabalían.

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