Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 12 April-18 April 2023 (Continuing Activity)

JMA reported that minor inflation on Asamayama's W flank persisted during 10-17 April. The daily number of shallow volcanic earthquakes was 40-80 during 10-14 April and around 40 during 14-17 April. Sulfur dioxide emissions were high at 700 tons per day on 14 April. Read all

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 29 March-4 April 2023 (Continuing Activity)

JMA reported that inflation on Asamayama's W flank persisted during 29 March-4 April, and the number of shallow volcanic earthquakes continued to increase. There were 95 events on 29 March, 91 on 30 March, 94 on 31 March, 77 on 1 April, 68 on 2 April, 104 on 3 April, and 149 on 4 April. Sulfur dioxide measurements were 1,600 tons per day on 29 March, which had increased compared to the previous measurement of 100 tons per day on 17 March. Read all

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 March-28 March 2023 (New Activity / Unrest)

JMA reported that inflation on Asamayama's W flank began to be detected on 15 March, and the number of shallow volcanic earthquakes increased on 21 March. On 22 March JMA raised the Alert Level to 2 (on a scale of 1-5) and warned the public that very small eruptions may impact areas within 500 m of the crater. Read all

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 12 April-18 April 2023 (Continuing Activity)

JMA reported that minor inflation on Asamayama's W flank persisted during 10-17 April. The daily number of shallow volcanic earthquakes was 40-80 during 10-14 April and around 40 during 14-17 April. Sulfur dioxide emissions were high at 700 tons per day on 14 April. Read all

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 29 March-4 April 2023 (Continuing Activity)

JMA reported that inflation on Asamayama's W flank persisted during 29 March-4 April, and the number of shallow volcanic earthquakes continued to increase. There were 95 events on 29 March, 91 on 30 March, 94 on 31 March, 77 on 1 April, 68 on 2 April, 104 on 3 April, and 149 on 4 April. Sulfur dioxide measurements were 1,600 tons per day on 29 March, which had increased compared to the previous measurement of 100 tons per day on 17 March. Read all

Asamayama volcano (Honshu, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 22 March-28 March 2023 (New Activity / Unrest)

JMA reported that inflation on Asamayama's W flank began to be detected on 15 March, and the number of shallow volcanic earthquakes increased on 21 March. On 22 March JMA raised the Alert Level to 2 (on a scale of 1-5) and warned the public that very small eruptions may impact areas within 500 m of the crater. Read all