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Asama volcano eruptions

complex volcano 2568 m / 8,425 ft
Honshu (Japan), 36.4°N / 138.53°E
Eruption list: 2019, 2015, 2009, 2008, 2004, 2003, 1990, 1983, 1982, 1982, 1973, 1965, 1961, 1958-59, 1953-55, 1952, 1952, 1950-51, 1949, 1947, 1946, 1944-45, 1938-42, 1935-37, 1934, 1934, 1933, 1931-32, 1930, 1929, 1929, 1927-28, 1924, 1922, 1920-21, 1919, 1918(?), 1917, 1916, 1915, 1914, 1909-14, 1908, 1908, 1907, 1907, 1906, 1905(?), 1904, 1903, 1902, 1902, 1900-01, 1899, 1899, 1894, 1889, 1879, 1878(?), 1875, 1869, 1815, 1803, 1803, 1783, 1779(?), 1777, 1776, 1769, 1762, 1755, 1754, 1733, 1732, 1731, 1729, 1729, 1728, 1723, 1723, 1722, 1721, 1720, 1719, 1718, 1717, 1711, 1710, 1708-09, 1706, 1704, 1703, 1669, 1661, 1661, 1660, 1659, 1658, 1657, 1656, 1655, 1653, 1652, 1651, 1650(?), 1649, 1648, 1648, 1647, 1645, 1644, 1609, 1605, 1604, 1600, 1598, 1597, 1596, 1596, 1595(?), 1591, 1590, 1532, 1528, 1527, 1518, 1427(?), 1281, 1108, 887, 685


2009 Eruption

Following record levels of SO2 emission (up to 5,000 tons per day), Asama volcano erupted on 2 February at 1:51 am local time. The eruption produced an ash plume rising 2 km and many bombs which fell up to 1 km from the crater. Light ash fall reached Tokyo, 145 km SE of the volcano, and beyond.

2008 activity

3 small ash eruptions were observed at Asama volcano in August 2008, the first activity since 2004.

2004 vulcanian eruption

A large single vulcanian explosion occurred at Asama volcano at 20:02 local time on 1 September 2004. It was stated to be the largest eruption in over 20 years.
[more]

1990-2003 activity: steaming and earthquakes, minor ash emissions

Most of the period from 1990-2003, Asama was comparably quiet, with only steam emission and several earthquakes swarms.
Such periods of earthquake swarms peaked in April 1991, April 1995 and June 1996, when more than 1000 earthquakes were recorded, but not followed by eruptions.
Periods of heightened seismicity were also recorded during September 2000 and June 2002.
4 minor ash eruptions occurred during February-April 2003.
(Source: GVP monthly reports)

1983 summit crater eruption

An explosive summit eruption occurred on 8 April 1983, producing incandescent tephra and a large ash plume reaching probably 5 km height. Fine ash fell to the ENE in up to 250 km distance from the volcano.

1982 eruption

2 explosive eruptions occurred at the summit of Asama volcano on 26 April, 2 October at 02:25 and 05:48 local time. The eruptions produced a small pyroclastic flow and fine ash fall in Tokyo, 130 km to the SE, for the first time in 23 years.
[more]

1973 eruption

A powerful eruption occurred on 1 February 1973, the first since 1961.
[more]

1783 subplinian eruption

The large eruption of Asama volcano in 1783 was one of Japan's largest and most destructive eruptions in the past 1000 years. It started with sporadic ash ejections beginning 9 May, and gradually increased in intensity.
After late July, the eruption became continuous, forming a huge plinian ash cloud that blackened out the eastern sky and was full of heavy thunder and lightning. Powerful shock waves shook houses and caused panic.
The eruption culminated in a series of very powerful explosions starting on 4 August, and terminated with a giant explosion at about 10 am on 5 August, which could be heard 300 km away.
The eruption produced highly destructive and very unusual pyroclastic flows, heavy ash and pumice falls, large lava flows and built a cone. It completely destroyed 4 villages, thousands of houses, and killed about 1400 people.
[more]
Asama volcano satellite image by (c) Google Earth View & VolcanoDiscovery
Asama volcano satellite image by (c) Google Earth View & VolcanoDiscovery
Wed, 4 Aug 2021, 06:00

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 4 August-10 August 2021 (Continuing Activity)

On 6 August JMA lowered the Alert Level for Asamayama to 1 (on a scale of 1-5), noting that the number of shallow volcanic earthquakes had been decreasing, sulfur dioxide gas emissions had been low, and deformation on the W flank had stabilized. JMA reminded the public to stay 500 m away from the crater. ... Read all
Wed, 9 Jun 2021, 17:58

Asama volcano (Honshu, Japan): continuing gas-steam emissions

Ongoing gas and steam plume from Asama volcano today may indicate possible eruption (image: JMA)
The activity of the volcano continues to be elevated since 15 March as the increase of seismic activity and slight inflation have been recorded. ... Read all
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