Suwanosejima volcano (Ryukyu Islands, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 31 March-6 April 2021 (New Activity / Unrest)
JMA reported that during 30-31 March large volcanic bombs were ejected at least 41 times from Suwanosejima's Ontake Crater as high as 800 m above the crater rim and to distances as far as 1 km. The Alert Level was raised to 3 (on a 5-level scale) at 0330 on 31 March and the public was warned to stay outside a 2 km radius of the crater. The increased activity prompted an overflight that same day where scientists confirmed several hundred high-temperature bomb deposits with a thermal camera within a 1 km radius.
mer., 31 mars 2021, 06:0006:00 AM | AUTEUR : VN
Explosions at 2205 on 30 March and 0257 on 31 March ejected bombs onto the S and SE flanks, respectively. Grayish-white emissions rose from the crater. After 1500 eruption plumes rose as high as 1.4 km above the crater rim.
The number of explosions decreased; two per day were recorded during 1-2 April and one was recorded on 3 April. The Alert Level was lowered to 2 on 5 April and the public was warned to stay 1 km away from the crater.
Source: Japan Meteorological Agency (JMA)
From: Global Volcanism Program, 2021. Report on Suwanosejima. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 31 March-6 April 2021. Smithsonian Institution and US Geological Survey.
mar., 30 mars 2021, 18:45
Suwanose-jima Volcano Volcanic Ash Advisory: ACTIVITY CONT. VA AT 20210330/1800Z FL050 EXTD SW OBS VA DTG: 30/1810Z
mar., 30 mars 2021, 12:15
Suwanose-jima Volcano Volcanic Ash Advisory: ACTIVITY CONT. VA AT 20210330/1200Z FL050 EXTD SE OBS VA DTG: 30/1150Z