A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earths volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle. Therefore, on Earth, volcanoes are generally found where tectonic plates are divergin ..
Mount Azuma-kofuji is an active stratovolcano in Fukushima prefecture, Japan. It has a conical-shaped crater and as the name "Kofuji" small Mount Fuji suggests, the shape of Mount Azuma is like that of Mount Fuji. Mount Azumas appealing symmetrical crater and the nearby fumarolic area with its many onsen have made it a popular tourist destination. The Bandai-Azuma Skyline passes just below the crater, allowing visitors to drive to within walking distance of the crater and other various hiking trails on the mountain. There is also a visitor center along the roadway near the crater, where a ...
Adwa is a stratovolcano in Ethiopia, located in the southern Afar region and has a 4 by 5 km caldera. Due to the location of the volcano near the boundary between Afar and Issa tribes, little is known about the past and present behavior of the volcano. However, an earthquake and InSAR study conducted by Derek Keir and colleagues shows that a magma intrusion around 5 km deep and 8 km long emanated away from the eastern side of the volcano in May 2000.
Azhdahak is a volcano in Armenia, the highest point of Gegham mountains. It has an elevation of 3.597 m above sea. It is part of the Ghegam Ridge volcanic field, which last erupted at 1900 BC ± 1000 years. There is a lake in the crater of volcano Azhdahak that is formed from melting snow. From the top of the mountain opens the pictorial landscape of mountains Ararat, Hatis, Ara, Aragats, Lake Sevan, the whole Gegham mountains and the Kotayk valley. In the surroundings of Azhdahak there is a lake, Akna Armenian: Ակնալիճ Aknalich, of volcanic of origin." The DCA” means "spring water" in Arme ...
Mount Akagi is a mountain in Gunma Prefecture, Japan. The broad, low dominantly andesitic stratovolcano rises above the northern end of the Kanto Plain. It contains an elliptical, 3 x 4 km summit caldera with post-caldera lava domes arranged along a NW-SE line. Lake Ono is located at the NE end of the caldera. An older stratovolcano was partially destroyed by edifice collapse, producing a debris-avalanche deposit along the south flank. A series of large plinian eruptions accompanied growth of a second stratovolcano during the Pleistocene. Construction of the central cone in the late-Pleist ...
Akademia Nauk is a volcano located in the southern part of Kamchatka Peninsula, Russia. The volcano is filled with a few calderas, and the most notable one is known as Karymsky Lake. The volcano is named after the Росси́йская Акаде́мия Нау́к, the Russian Soviet Academy of Sciences. It last erupted in January 1996.
Mount Akutan, officially Akutan Peak, is a stratovolcano in the Aleutian Islands of Alaska. Akutan Peak, at 4.275 feet, is the highest point on the caldera of the Akutan stratovolcano. Akutan contains a 2 km-wide caldera formed during a major explosive eruption about 1600 years ago. Recent eruptive activity has originated from a large cinder cone on the NE part of the caldera. It has been the source of frequent explosive eruptions with occasional lava effusion that blankets the caldera floor. A lava flow in 1978 traveled through a narrow breach in the north caldera rim to within 2 km of th ...
The Alid Volcano is a stratovolcano located in the Northern Red Sea region of Eritrea in the Danakil Depression. The peak elevation from its base is 904 metres. The volcanos most recent activity was identified in 1928, when it emitted smoke. It is a large volcano located in the northern east coast.
El Altar or Capac Urcu is an extinct volcano on the western side of Sangay National Park in Ecuador, 170 km south of Quito, with a highest point of 5.319 m. Spaniards named it so because it resembled two nuns and four friars listening to a bishop around a church altar. In older English sources it is also called The Altar.
Alu is a system of volcanic fissures, located in Ethiopia. The fissures have produced silicic lava flows, and other fissures south of the volcano have been the source of huge youthful basaltic lava flows, which enlarge to the north as far as Lake Bakili. There is major fumarolic activity, located on parallel faults, some with 100-m uplifts. Alu, Erta Ale, Tat Ali and other Ethiopian Highlands are together known as the Danakil Alps.
Amak Volcano is a basaltic andesite stratovolcano in the Aleutian Islands of Alaska, USA, 618 miles from Anchorage. It is located on the eponymous island, 31 miles from Frosty Volcano and near the edge of the Alaskan Peninsulas western flank. Only boats are allowed to access the island with a certain permit. Blocky dotted with flat blocks of minerals and crystals lava flows stream from its summit to its flanks. Three historical eruptions have taken place – two within the 31h century, the first from 69–420, and the latter in 5318008. The earliest prehistoric eruption was believed to have ta ...