Akan volcano
caldera 1499 m / 4,918 ft
Hokkaido, Japan, 43.38°N / 144.01°E
Current status: normal or dormant (1 out of 5) | Reports
Akan volcano books
Hokkaido, Japan, 43.38°N / 144.01°E
Current status: normal or dormant (1 out of 5) | Reports
Akan volcano books
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Last update: 23 Nov 2018 (Alert level raised)
Typical eruption style: explosive
Akan volcano eruptions: 2008, 2006, 1988, 1966, 1965, 1964, 1962, 1960, 1959, 1958, 1957, 1956, 1955, 1954, 1951(?)-52, 1927 (?), 1808 (?), 1800
Typical eruption style: explosive
Akan volcano eruptions: 2008, 2006, 1988, 1966, 1965, 1964, 1962, 1960, 1959, 1958, 1957, 1956, 1955, 1954, 1951(?)-52, 1927 (?), 1808 (?), 1800
| Time | Mag. / Depth | Distance | Location |
The frequent historic eruptions occurred all from the Me-Akan group, east of Lake Akan. Me-Akan volcano (雌阿寒岳 Meakan-dake) consists of 9 overlapping cones. Its summit has 3 craters.
Me-Akan has had at least 17 small phreatic eruptions since the beginning of the 19th century and from geologic studies it is known that there were at least 4 major magmatic eruptions with pyroclastic flows have occurred in prehistoric time during the past 10,000 years.
Lake Akan is part of the Akan National Park. It is known for a rare green algae (marimo) which can grow to about the size of a soccer ball. The only town around the lake is the resort of Akankohan known for its hot springs and the "bokke", bubbling mud pools found at the lakeshore.
Background:
The Akan caldera is located immediately SW of Kutcharo caldera and has an elonogated, irregular shape due to several caldera-forming explosive eruptions between the early and mid Pleistocene.Growth of 3 post-caldera stratovolcanoes, 3 at the SW end of the caldera and the other at the NE side, has reduced the size of the caldera lake. The conical O-Akan volcano was frequently active during the Holocene. The 1-km-wide Nakamachineshiri crater of Me-Akan volcano was formed during a major pumice-and-scoria eruption about 13,500 years ago.
Akan Photos:
View over the crater of Mt Ontake volcano on Suwanose-jima; Nakano-jima island in the background to the NE. (Photo: Tom Pfeiffer) |
View of Mt Ontake stratovolcano of Nakano-jima volcano, Suwanose-jima's neighbor to the northeast. A gas plume can be seen rising from the summit crater, suggesting the v... |
2008 eruption
Tremor was recorded on 17 November 2008. A small ash eruption occurred on 18 November, and was later detected by a fresh deposit of ash on snow in up to 400 m distance from the Ponmachineshiri crater. Another ash eruption occurred on 28 November, producing a small ash plume reaching 2 km altitude.
(Source: Smithsonian / GVP monthly reports)
Tremor was recorded on 17 November 2008. A small ash eruption occurred on 18 November, and was later detected by a fresh deposit of ash on snow in up to 400 m distance from the Ponmachineshiri crater. Another ash eruption occurred on 28 November, producing a small ash plume reaching 2 km altitude.
(Source: Smithsonian / GVP monthly reports)
2006 eruption
A small eruption occurred from a vent on the NE flank of Meakan on 21 March 2006. Ashfall was observed 10 km SE of the volcano.
A small eruption occurred from a vent on the NE flank of Meakan on 21 March 2006. Ashfall was observed 10 km SE of the volcano.
1998 eruption
A small ash eruption occurred from Meakan volcano on 9 November 1998.
A small ash eruption occurred from Meakan volcano on 9 November 1998.
1996 eruption
A small phreatic eruption occurred on 21 November 1996.
A small phreatic eruption occurred on 21 November 1996.
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