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Suwanosejima volcano (Ryukyu Islands, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 18 August-24 August 2021 (Continuing Activity)

Mi, 18. Aug 2021, 06:00
06:00 AM | VON: VN
JMA reported that explosions at Suwanosejima's Ontake crater were detected on 19, 20, and 21 August. The first explosion at 0137 on 19 August produced an ash plume that rose 3 km above the crater and drifted NE, followed by another at 1613 that generated an ash plume 2.2 km above the crater and drifted N. A small amount of ashfall was reported in Yakushima, Nishinoomote, and Nakatane.
A third explosion at 2059 that day produced an ash plume that rose 2.5 km above the crater and drifted N; ashfall was reported in Toshima village (4 km SSW). Explosions at 0628 and 0713 on 20 August generated ash plumes that rose 2.5-3 km above the crater and drifted N, resulting in ashfall in Toshima village, with smaller amounts of ash in Yakushima, Mishima, Ibusuki, Minamikyushu, and Makurazaki. On 21 August at 0617 an explosion generated an ash plume that rose 3.2 km above the crater and drifted N.
A large amount of ashfall (over 1 mm) was reported in Toshima village and smaller amounts (less than 0.1 mm) were reported in Makurazaki, Minamisatsuma, Minamikyushu, Kagoshima, Ibusuki, and Hioki. A second explosion followed at 0906 that produced an ash plume 3.2 km above the crater that drifted N. The Tokyo VAAC reported ash plumes to 1.5-3.9 km (5,000-13,000 ft) altitude that drifted NE during 18-25 August.
The Alert Level remained at 2 and the public was warned to stay 1 km away from the crater.

Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)
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From: Global Volcanism Program, 2021. Report on Suwanosejima. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 18 August-24 August 2021. Smithsonian Institution and US Geological Survey.

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Schichtvulkan 799 m/ 2,621 ft
Ryukyu-Inseln (Japan), 29.64°N / 129.72°E
Aktueller Status: Ausbruch (4 von 5) Ausbrüche des Suwanose-jima:
2004 (Oct) - ongoing: intermittent strombolian-type activity
Since 1949: essentially continuous activity
2000 (Dec) - Jul 2004 (Jul): strombolian activity, 1999 (Jan-Feb, June), 1996 (Dec) - 1997 (Apr), 1949-96, 1940, 1938, 1934 (?), 1925, 1921-22, 1915 (?), 1914 (?), 1889, 1885, 1884, 1877, 1813-14 (sub-plinian Bunka eruption), around 1600 AD (large explosive eruption)
Typische Aktivität
explosive, strombolian
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