Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 March-30 March 2021 (New Activity / Unrest)
On 23 March JMA raised the Alert Level for Asamayama to 2 (on a scale of 1-5), noting slight inflation on the W side of the volcano since 15 March and an increase in the number of daily volcanic earthquakes that have occurred since 20 March (36 recorded on 20 March and increasing to 77 events by 1500 on 23 March). After 23 March the number of daily volcanic earthquakes began to fluctuate, decreasing to 15 on 28 March and then 23 by 1500 on 29 March. The sulfur dioxide emission rate was 800 tons per day (t/d) on 22 March, 400 t/d on 24 March, and 700 t/d on 25 March, compared to the previous measurement of 200 t/d on 25 February.
Wed, 24 Mar 2021, 06:0006:00 AM | BY: VN
Source: Japan Meteorological Agency (JMA)
From: Global Volcanism Program, 2021. Report on Asamayama. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 24 March-30 March 2021. Smithsonian Institution and US Geological Survey.
Fri, 5 Feb 2021, 08:08
The alert level for the volcano was lowered to Level 1, as a low-level activity continues. ... Read all
Wed, 3 Feb 2021, 06:00
Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 3 February-9 February 2021 (Continuing Activity)
On 5 February JMA lowered the Alert Level for Asamayama to 1 (on a scale of 1-5) noting that no deformation or crater incandescence had been detected since late November 2020, sulfur dioxide emissions had trended downward beginning in December, volcanic earthquakes were recorded only occasionally since mid-December, and the number of small-amplitude volcanic tremors were recorded occasionally and had not increased. ... Read all