Get our newsletter!
Check out our volcano tours on VolcanoAdventures.com!
Volcanoes & Earthquakes - new app for Android
Guaranteed tours:
26 Sep - 1 Oct 2018: Adventure Volcano - Yasur Volcano Travel - Tanna Island (Vanuatu)
26 Sep - 10 Oct 2018: Volcanoes and Cultures - Adventures in the South Sea - Vanuatu (South Sea)
30 Sep - 7 Oct 2018: Fascination Volcano - Santorini Island (Greece)
30 Sep - 10 Oct 2018: The Volcanoes of Ambrym - the Grand Traverse - Vanuatu (South Sea)
6-13 Oct 2018: Pearl of the Aegean - Santorini - Santorini Island, Greece
12-17 Oct 2018: Krakatau Volcano Special - Krakatau volcano, Sunda Strait
13-20 Oct 2018: Almonds, olives and volcanoes - Nisyros Island, Greece
13-29 Nov 2018: Volcano Special: Ibu - Dukono - Lokon - Halmahera (Indonesia)
17-30 Nov 2018: Desert, salt and volcanoes - Danakil desert (Ethiopia)
8-21 Dec 2018: Desert, salt and volcanoes - Danakil desert (Ethiopia)
: spaces available / : guaranteed / : few spaces left / : booked out
Random pictures
Kusatsu-Shirane volcano
stratovolcanoes 2171 m / 7,123 ft
Honshu, Japan, 36.62°N / 138.54°E
Current status: minor activity or eruption warning (3 out of 5)
Kusatsu-Shirane webcams / live data | Reports
Kusatsu-Shirane volcano books
Kusatsu-Shirane volcano eruptions:
2018, 1989, 1982-83, 1976, 1958, 1942, 1939, 1938(?), 1937, 1934, 1933(?), 1932, 1927, 1925, 1905, 1903(?), 1902, 1900, 1897, 1882, 1805
Typical eruption style:
phreatic eruptions from the crater lakes
Last earthquakes nearby
Latest satellite images
 

Kusatsu-Shirane volcano news & activity updates:

Kusatsu-Shirane volcano (Japan): short, but violent explosive eruption with no warning, one fatality

Wednesday Jan 24, 2018 09:19 AM | BY: T

Eruption of Kusatsu-Shirane yesterday (JNN)
Eruption of Kusatsu-Shirane yesterday (JNN)
An unexpected, relatively intense but short-lived explosive eruption occurred yesterday at the volcano, which is home to a popular ski resort. Tragically, the eruption triggered an avalanche that killed one person and ballistic projectiles wounded several others who were near the vent at the time of the explosion.

With apparently no precursors, the eruption started shortly before 10 am from a vent in the valley between the young cinder cones of Aino Mine and the twin cone of Motoshirane San, both in the saddle south of the main summit cone. One of the ski lifts and runways pass very close to the vent.
Numerous skiers were only few hundreds meters away when the activity started to eject strong, vertical jets of steam mixed with ash and debris that rose a few 100 meters and sent blocks to up to 250 m distance.

The video taken by the webcam shows the activity with blocks falling on the snow, on trees and hitting the cable car:

The explosive activity decreased quickly again and might very well remain a single isolated event, similar to almost all known historic activity from the volcano. The Japanese Meteorological Survey raised the alert level from 1 to 3 (on a scale of 1-5).

It seems that the eruption was entirely phreatic or, more likely hydrothermal in nature, i.e. driven by steam explosions, and did not involve any fresh magma reaching the surface. There is no indication that magma was involved in the process; the observed activity is likely to be the result of overheated ground water that flashed into steam as a rapid adjustment of accumulated instability in the shallow hydrothermal system of the volcano.
The complex of the Kusatsu-Shirane volcano is known for its intense hydrothermal activity, which indicates that its shallow edifice is rich in circulating hot fluids; an acid lake occupied the summit crater of Shirane-San and there are many fumarole fields on the volcano; some of them were formerly were exploited to extract sulfur in up to 5 mines (now closed); numerous hot springs and spas are also found on the flanks of the volcano.

As is often the case with phreatic or hydrothermal explosions, there were probably no precursors; this of course reminds the tragic disaster of the nearby Ontake volcano eruption in 2014, which also was entirely steam-driven, had no significant or usable precursor signals, and killed more than 50.
A bit surprising was the site of the eruption, which is outside any of the younger craters of the volcano, and in an area where there had previously not been any particular activity such as fumaroles or fissures.
Previous news
Thursday, Aug 21, 2014
JMA reported that during 8-15 August volcanic earthquakes continued at Kusatsu-Shiranesan’s crater, although they had decreased from early August and tremor was absent. The Alert Level remains at 2 (on a scale of 1-5). ... [more]
Thursday, Jul 03, 2014
JMA reported that deformation of Kusatsu-Shiranesan’s crater and the elevated temperatures which began earlier in March, continued during 25-30 June. ... [more]

More on VolcanoDiscovery:

Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Text and images on this webpage are copyrighted. Further reproduction and use without authorization is not consented. If you need licensing rights for photographs, for example for publications and commercial use, please contact us.
Home | Travel | Destinations | Volcanoes | Photos | Earthquakes | About | Glossary | News | Contact | Privacy | Imprint || Français | Deutsch
Follow us: