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News
Friday, Jun 21, 2019
On 17 June JMA lowered the alert level for Azumayama to 1 (the lowest level on a 5-level scale), noting that deformation and elevated seismicity recorded in May had stabilized and decreased, respectively. [more]
Friday, Dec 12, 2014
Japan's Met Office (JMA) detected increased seismic activity at the volcano and raised the alert level to 2. Access to the crater, a popular walking trail, is now closed. [more]
 

Azuma volcano eruptions

stratovolcanoes 2035 m / 6,676 ft
Honshu, Japan, 37.73°N / 140.25°E
Eruption list: 2008, 1977, 1966, 1952 (?), 1950, 1914, 1896, 1895, 1894, 1893, 1893, 1844, 1800 (?), 1711?, 1331, 600 AD ± 200 (RC), 150 BC ± 200 (RC), 950 BC ± 100 (RC), 1800 BC ± 50 (RC), 2750 BC ± 200 (RC), 3000 BC ± 50 (RC), 4150 BC ± 500 (RC), 4550 BC ± 1000 (TC), 5400 BC ± 200 (RC), 5700 BC ± 50 (RC)
(RC: radiocarbon-dated, TC: tephrochronology


2008 eruption and new fumarole
A new fumarole producing a plume rising a few 100 m appeared at the northwestern rim of Oana crater of Azuma volcano on 11 Nov 2008 and new mud deposits including lithic fragments were found around the new fumarolic crater.
Japanese scientist measured the fumarolic gases and found high concentrations (2.3-3.0%) of SO2 and temperatures of up to 475 deg C.
(Shin’ya Onizawa, Hiroshi Shinohara, Nobuo Matsushima: "Appearance of a new fumarole in November 2008 and related mud deposits in Azuma volcano" JPGU Meeting 2009 poster abstract)

2001 seismic activity increases
An small swarm of earthquakes occurred beneath Azuma during May 2001, peaking between 21-22 May when 51 volcanic tremors were measured in total, out of which 33 were felt by residents.
(GVP monthly reports)

1996 and 1998 tremors
Small volcanic earthquakes and slight volcanic tremor were detected above background levels in 1996 and 1998.

1977-1978 eruptions
An eruption occurred on 7 December 1977, after earthquakes had begun in September 1977, followed by spattering ejection of mud and sand and small blocks in October. Active fuming was seen in November. It produced an ash plume rising 500-1,000 m above the crater and causing minor ashfall. Similar ash ejections occurred sporadically through January 1978.
(GVP monthly reports)

1893 eruption and fatalities
An phreatic explosion from Issaikyo crater west of Oana killed 2 geologists who were hit by falling stones.
(NOAA National Geophysical Data Center, Significant Volcanic Events)
 

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