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Report on Alaid (Russia) — 10 October-16 October 2012

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 10 October-16 October 2012
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2012. Report on Alaid (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 October-16 October 2012. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (10 October-16 October 2012)


Alaid

Russia

50.861°N, 155.565°E; summit elev. 2285 m

All times are local (unless otherwise noted)


According to KVERT, observers on Paramushir Island reported that on 5 October a large gas-and-steam plume from Alaid rose 200 m above the crater. A thermal anomaly on the volcano was detected in satellite imagery for 7.5 hours the next day. The increased activity prompted KVERT to raise the Aviation Color Code to Yellow on 7 October. Satellite imagery detected a thermal anomaly on 15 October.

Geologic Background. The highest and northernmost volcano of the Kuril Islands, 2285-m-high Alaid is a symmetrical stratovolcano when viewed from the north, but has a 1.5-km-wide summit crater that is breached widely to the south. Alaid is the northernmost of a chain of volcanoes constructed west of the main Kuril archipelago. Numerous pyroclastic cones dot the lower flanks of this basaltic to basaltic-andesite volcano, particularly on the NW and SE sides, including an offshore cone formed during the 1933-34 eruption. Strong explosive eruptions have occurred from the summit crater beginning in the 18th century. Reports of eruptions in 1770, 1789, 1821, 1829, 1843, 1848, and 1858 were considered incorrect by Gorshkov (1970). Explosive eruptions in 1790 and 1981 were among the largest in the Kuril Islands during historical time.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)