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Kikai volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 April-1 May 2018 (Continuing Activity)

Wed, 25 Apr 2018, 06:00
06:00 AM | BY: VN
JMA reported that the number of volcanic earthquakes at Satsuma Iwo-jima, a subaerial part of Kikai's NW caldera rim, was low during 20-26 April. White plumes rose as high as 700 m above the Iwo-dake lava dome; incandescence from the crater had not been visible since 12 April. During field surveys on 25 and 26 April observers noted a slight expansion of a thermally anomalous area compared to 24-25 March observations, and a decrease in sulfur dioxide flux from 600 tons/day on 24 March to 300 tons/day.
The Alert Level was reduced to 1 (on a 5-level scale) on 27 April.

Source: Japan Meteorological Agency (JMA)
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From: Global Volcanism Program, 2018. Report on Kikai. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 April-1 May 2018. Smithsonian Institution and US Geological Survey.

Previous news

Wed, 28 Mar 2018, 06:00

Kikai volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 28 March-3 April 2018 (New Activity / Unrest)

JMA reported that the number of volcanic earthquakes at Satsuma Iwo-jima, a subaerial part of Kikai's NW caldera rim, was low during 27 March-2 April after an increase recorded during 22-23 March. White plumes rose as high as 1.8 km above the Iwo-dake lava dome. Incandescence from the crater was visible at night during 27-28 March. ... Read all
Wed, 14 Mar 2018, 06:00

Kikai volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 14 March-20 March 2018 (New Activity / Unrest)

JMA reported that one small-amplitude, short-duration volcanic tremor was detected on 16 March at Satsuma Iwo-jima, a subaerial part of Kikai's NW caldera rim. The number of volcanic earthquakes increased on 19 March, prompting JMA to raise the Alert Level to 2 (on a 5-level scale), and then decreased the next day. The report noted increased thermal activity since February, with occasional visual observations of incandescence. ... Read all
Show more
Kikai volcano
caldera 704 m / 2,310 ft
Ryukyu Islands (Japan), 30.79°N / 130.31°E
Current status: restless (2 out of 5) Kikai volcano eruptions:
2020, 2019, 2013, 2004, 2003, 2002, 2000-01, 2000, 1998-99, 1997, 1988, 1934-35, 1914 (?)
radiocarbon / tephrochronology dated: 1430 ± 75 years, 1340 ± 30, 1030 ± 40, 1010 ± 40, 750 AD (?), 390 AD ± 100, 280 BC ± 75, 1090 BC ± 100, 1830 BC ± 75, 2450 BC ± 1000, 3250 BC ± 75, 3250 BC ± 75
around 4350 BC: VEI 7 caldera-forming eruption, one of the largest on earth in 10,000 years, producing the Akahoya tephra
Typical eruption style
explosive
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