Sakurajima volcano news
Sakurajima volcano (Kyushu, Japan): increasing activity, field report 23-29 Mar 2018
Donnerstag Mär 29, 2018 07:48 | VON: T
Large vulcanian explosion of Sakurajima on 26 Mar 2018
Ash column and plume from an explosion on 27 Mar 2018
Since around mid March, the activity of the volcano has picked up noticeably, characterized by intense ash emissions and discrete vulcanian explosions now at rates of approx. 1-2 per day.
Plume heights over the past months, showing the increase in activity (image: JMA)
A small group on one of VolcanoDiscovery's Volcano Specials has been on location since 22 March and could observe the activity from close:
Most activity seems to originate from the summit crater Minamidake, which 50-70% of the time has hours-long phases of near-continuous ash emissions. These seem to be of low energy and generate moderately dense ash plumes that rise a few 100 meters up to approx. 1 km from the summit. At other times, white to gray gas plumes with little ash content rise several 100 meters, whereas near-complete calm is rarely observed.
Moderate to comparably large vulcanian-style explosions accompanied by felt shock waves and generating ash plumes up to 3.5 km above the summit have been occurring once to twice a day since we've been in the surroundings; the largest was an explosion from Minamidake crater on 26 March at 15:41 local time, generating an ash column that rose 3400 m and ejected ballistic blocks to 1 km radius around the crater. According to JMA, it was the 19th explosion in 2018. As of now, this list has grown to 22 after a similar event this morning.
Most of the time, these explosions occurred after phases of relative calm, which presumably stand for periods in which pressure is able to accumulate.
The Showa crater also produces bluish to white and gray plumes most of the time, which seem to increase in tandem with the summit crater. We also think that it emits ash plumes although it is often difficult to distinguish them visually from those of the summit crater.
Donnerstag, Mär 29, 2018
Mittwoch, Mär 28, 2018
Sakurajima volcano Volcanic Ash Advisory: EXPLODED AT 20180328/0124Z FL130 EXTD E OBS VA DTG: 28/0200Z
Mittwoch, Mär 28, 2018
Dienstag, Mär 27, 2018