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Mount Asama (浅間山, Asama-yama) is an active complex volcano in central Honshū, the main island of Japan.The volcano is the most active on Honshū. [4] The Japan Meteorological Agency classifies Mount Asama as rank A. [5] It stands 2,568 metres (8,425 ft) above sea level on the border of Gunma and Nagano prefectures. [6]
The town is located on an elevated plain at the foot of Mount Asama, one of Japan's most active volcanoes. The mountain is classed as a Category A active volcano. A small eruption was detected in June 2015, a more significant eruption spewing hot rocks and a plume of ash occurred in February 2015.
Quaternary Volcanoes of Japan - Geological Survey of Japan; Volcano on Google Map - Geological Survey of Japan; The National Catalogue of the Active Volcanoes in Japan - Japan Meteorological Agency; 日本の主な山岳標高 (Elevation of Principal Mountains in Japan) - Geospatial Information Authority of Japan (in Japanese)
The Tenmei mudflow means a large-scale volcanic mudflow caused by the 1783 eruption of Mount Asama, killed 1,523 people and destroyed 2,065 homes. [ 2 ] [ 5 ] [ 6 ] This museum houses a collection of artifacts from the time of the eruption that were excavated from the areas submerged by the Yamba Dam .
The crater of Mt. Naka, the west side of which is accessible by road, contains an active volcano which continuously emits smoke and has occasional eruptions. Only the northernmost crater (the first crater) has been active for the last 70 years—1974, 1979, 1984–1985, 1989–1991, [ 1 ] 2009, 2011, 2015, [ 2 ] 2016 [ 3 ] [ 4 ] and 2021.
Illustration of the eruption of Mt. Asama. Mount Asama erupted in 1783, causing widespread damage. [14] [15] [16] The three-month-long Plinian eruption that began on 9 May 1783, produced andesitic pumice falls, pyroclastic flows, lava flows, and enlarged the cone. The climactic eruption began on 4 August and lasted for 15 hours, [17] and contained
2021 : On August 13, smoke from an undersea eruption of the seafloor is observed rising about 17,000 m (56,000 ft) high, in addition to volcanic lightning. Initially, volcanic ash crosses the Bashi Channel and enters the South China Sea. [12] This eruption is considered to be one of the largest in Japan after the Second World War. [13]
Earlier eruptions built the white sand highlands in the region. On September 13, 2016, a team of experts from Bristol University and the Sakurajima Volcano Research Centre in Japan suggested that the volcano could have a major eruption within 30 years; since then two eruptions have occurred. [6] Sakurajima is a stratovolcano.