Atlasov Island, Northern Kuriles, 50.86°N / 155.55°E
Condition actuelle: Activité petite ou avertissement éruption imminente (3 sur 5)
Alaid is the tallest and northernmost volcano in the Kurile Islands. Also called Atlasov as the island it forms, the symmetrical stratovolcano rises 3000 m from the sea floor and forms a small island. It has a 1.5-km-wide summit crater breached to the south. It is one of the Kuriles'most active volcanoes. Large explosive eruptions occurred in 1790 and 1981, and were among the largest in the Kuriles in historic times.
Eruptions du volcan Alaid: 2016 (Mar-May), 2015-16 (Oct-Jan), 2012, 1997, 1996, 1986, 1982, 1981, 1972, 1933-34, 1894, 1860, 1854, 1790-93
Derniers séismes prochesNo recent earthquakes
IntroductionNumerous flank cones dot the lower flanks of the basaltic to basaltic-andesite Alaid volcano, particularly on the NW and SE sides, including an offshore cone formed during the 1933-34 eruption.
Alaid has 2 types of eruptions: summit activity from the central crater as well as lateral eruptions. The eruptions from the central crater tend to be more explosive and are more dangerous. The largest eruptions from the central crater were in February 1793, June 1854, July 1860, 1894, and April 1981.
The principal volcanic hazard from Alaid are ash plumes dangerous for aircraft (many routes from N-America to Asia pass nearby).
Alaid stratovolcano, Atlasof Island, Northern Kuriles (Photo: Tom Pfeiffer)
Alaid volcano on Atlasov Island (Photo: Tom Pfeiffer)
Small bay in the shoreline with Alaid in the background (Photo: Tom Pfeiffer)
Natural bridge in the sea cliff with Alaid volcano in the background (Photo: Tom Pfeiffer)
Seismic tremor began at Alaid volcano on 31 October and continued until November. The tremor was believed to be caused by strong winds, not caused by volcanic activity. (Source: GVP monthly roports)
In August 1997, a thermal hotspot was visible on satellite images of the volcano indicating eruptive activity. Ashfall occurred on SW Kamchatka.
Seismic activity increased in December 1996. Satellite images showed a plume reaching a height of 6 km above the volcano. A large snow storm prevented any visual observations. (GVP monthly reports)
Aerial observations on 25 May 1986 revealed that the summit crater's 1981 cone (250 m high and 600 m across at its base) had been almost entirely destroyed recently. At its place there were 2 collapse craters, the larger of which measured 300 m across and ca. 100 m deep.
(Source: GVP monthly reports)
The eruption of Alaid volcano in 1981 ranks as one of the largest in the Kurile Islands in historical times. ...plus
A lateral, partly submarine eruption began at Alaid volcano in June 1972. An eruptive fissure extended from the NW base of the volcano to the sea. The water-magma interaction produced powerful explosions and ash plumes 8 km high.
1933-1934 eruptions: the first observed flank eruption
1894: summit eruption
1860: eruption from the summit crater
1854: strong explosive eruption from the summit crater
1793: explosive eruption from the summit crater
See also: Sentinel hub | Landsat 8 | NASA FIRMS