Usu Volcano
Updated: 28 avril. 2024 19:42 GMT -
stratovolcano 737 m / 2,418 ft
Hokkaido (Japon), 42.54°N / 140.84°E
Condition actuelle: normal / en sommeil (1 sur 5)
Hokkaido (Japon), 42.54°N / 140.84°E
Condition actuelle: normal / en sommeil (1 sur 5)
Mt Usu (有珠山) or Usu-zan volcano is Hokkaido is one of Japan's most well-known volcanoes, part of the active Toya caldera. The summit of Usu consists of several lava domes that formed in historic time.
The last eruption was in March 2000 - September 2001, when Usu erupted for the first time in 22 years and forced the evacuation of 13,000 residents.
In the official Global Volcanism Program's database, the volcano is referred to as Toya, the name of the large caldera, whose currently most active vent Usu represents.
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Eruptions du volcan Usu: 2000-01, 1977-82, 1944-45, 1910, 1853, 1822, 1769, 1663, 1638, 1626, 1611 (?)
Derniers séismes proches
Heure | Mag. / Profondeur | Distance / Lieu | |||
24 avril 00:04 (GMT +9) | 2.7 231 km | 6 km au nord | Japan: IBURI REGION | Info |
Introduction
Usu is a small stratovolcano located astride the southern topographic rim of the 110,000-year-old Toya caldera. The center of the 10-km-wide, lake-filled caldera contains Naka-jima, a group of forested andesitic lava domes. The summit of the basaltic-to-andesitic edifice of Usu is cut by a somma formed about 7-8,000 years ago when collapse of the volcano produced a debris avalanche that reached the sea. Dacitic domes erupted along two NW-SE-trending lines fill and flank the summit caldera. Three of these domes, O-Usu, Ko-Usu and Showa-Shinzan, along with seven crypto-domes, were erupted during historical time. The 1663 eruption of Usu was one of the largest in Hokkaido during historical time. The war-time growth of Showa-Shinzan from 1943-45 was painstakingly documented by the local postmaster, who created the first detailed record of growth of a lava dome.Usu Volcano Photos
Nous passons devant de nombreuses places pittoresques et de beaux bâtiments du centre historique de Naples en route vers le dîner de bienvenue... (Photo: Ingrid Smet)
Eruptions du volcan Usu
2000-01 eruption
The 2000 eruption of Usu volcano was the first in 22 years and followed several days of increased seismicity and ground deformation.
A first new vent opened in the West-Nishiyama area on 31 March 2000, followed by activity in the Kompira area on 1 April. Eruptive activity lasted for more than a year and gradually declined until September 2001. The eruptions were phreatic and phreato-magmatic, and caused small pyroclastic flows.
A large area of Usu volcano deformed during the eruption by uplift of up to 60 m vertical displacement and involving a volume of ca. 40 million m3.
The 2000 eruption of Usu volcano was the first in 22 years and followed several days of increased seismicity and ground deformation.
A first new vent opened in the West-Nishiyama area on 31 March 2000, followed by activity in the Kompira area on 1 April. Eruptive activity lasted for more than a year and gradually declined until September 2001. The eruptions were phreatic and phreato-magmatic, and caused small pyroclastic flows.
A large area of Usu volcano deformed during the eruption by uplift of up to 60 m vertical displacement and involving a volume of ca. 40 million m3.
1663 Plinian eruption
In 1663 Usu had a Plinian eruption (VEI5), one of the largest eruptions on Hokkaido during historical times. It caused wide-spread damage and fatalities.
In 1663 Usu had a Plinian eruption (VEI5), one of the largest eruptions on Hokkaido during historical times. It caused wide-spread damage and fatalities.