KVERT reported that the eruption at Alaid was ongoing during 14-20 October. An intense thermal anomaly was identified in satellite images during 13-16 and 20 October; weather clouds obscured views on the other days. Explosive activity during 13-16 October generated ash plumes that rose as high as 6.5 km (21,300 ft) a.s.l. and drifted 360 km E and SE. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Geological Summary. The highest and northernmost volcano of the Kuril Islands, Alaid is a symmetrical stratovolcano when viewed from the north, but has a 1.5-km-wide summit crater that is breached open to the south. This basaltic to basaltic-andesite volcano is the northernmost of a chain constructed west of the main Kuril archipelago. Numerous pyroclastic cones are present the lower flanks, 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 reported in the Kuril Islands.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)