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Akan volcan

Mise à jour: 7 déc.. 2022 23:20 GMT -
caldeira 1499 m / 4,918 ft
Hokkaido (Japon), 43.38°N / 144.01°E
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 13 déc. 2021 (Smithsonian / USGS Weekly Volcanic Activity Report)

Akan volcano (阿寒岳, Akan-dake) is one of Hokkaido's most active volcanoes. Akan consists of a large 24 x 13 km diameter caldera and a group of younger partly Holocene andesite cones. The highest point of the complex is the Mount Meakan (1499 m) stratovolcano.
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.

Montrer carte interactive
Style éruptif tipique: explosive
Eruptions du volcan Akan: 2008, 2006, 1988, 1966, 1965, 1964, 1962, 1960, 1959, 1958, 1957, 1956, 1955, 1954, 1951(?)-52, 1927 (?), 1808 (?), 1800

Derniers séismes proches

No recent earthquakes

Introduction

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



2008 l'éruption
Tremblement a été enregistré le 17 Novembre 2008. Une petite éruption de cendres a eu lieu le 18 Novembre, et a ensuite été détecté par un nouveau dépôt de cendres sur la neige en allant jusqu'à 400 m de distance du cratère Ponmachineshiri. Une autre éruption de cendres s'est produite le 28 Novembre, produisant un panache de cendres atteignant 2 petits km d'altitude.
(Source: Smithsonian / GVP rapports mensuels)

2006 l'éruption
Une petite éruption s'est produite à partir d'un évent sur le flanc NE de Meakan le 21 Mars 2006. Ashfall a été observé 10 km au SE du volcan.

éruption de 1998
Une éruption de cendres du volcan s'est produite petite Meakan le 9 Novembre 1998.

1996 l'éruption
Une petite éruption phréatique s'est produite le 21 Novembre 1996.

See also: Sentinel hub | Landsat 8 | NASA FIRMS
mer., 28 nov. 2018, 06:00

Akan volcano (Hokkaido, Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 28 November-4 December 2018 (New Activity / Unrest)

JMA reported that the number of earthquakes with shallow hypocenters and epicenters near Ponmachineshiri Crater, a summit crater of Me-Akan (also known as Meakan-dake, which means Meakan Peak) of the Akan volcanic complex, increased at 1800 on 20 November. Another seismic increase occurred on 23 November, in number and amplitude of events, prompting JMA to raise the Alert Level to 2 (the second lowest level on a 5-level scale). ... Read all
ven., 23 nov. 2018, 05:42

Akan volcano (Hokkaido, Japan) activity update: Alert level raised

A new earthquake swarm is occurring at the Meakandake cone so JMA has raised the alert level to 2. A similar event occurred 3 years ago. The last eruption was in 2008. ... Read all
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