KVERT reported that seismic activity at Shiveluch was moderate during 19-26 August, and indicated that possible ash plumes rose to an altitude of 8.2 km (26,900 ft) a.s.l. on 23 August. A thermal anomaly on the volcano was observed in satellite imagery on 18, 21, and 25 August. The Aviation Color Code remained at Orange.

Based on information from KEMSD and analyses of satellite imagery, the Tokyo VAAC reported that on 29 August an eruption produced a plume that rose to an altitude of 6.1 km (20,000 ft) a.s.l. and drifted E. Subsequent images that day showed that continuing ash emissions had later dissipated. According to a news article, international flights were re-routed that day due to ash plumes that reportedly rose to an altitude of 8.6 km (28,000 ft) a.s.l.

Geological Summary. The high, isolated massif of Sheveluch volcano (also spelled Shiveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group. The 1,300 km3 andesitic volcano is one of Kamchatka's largest and most active volcanic structures, with at least 60 large eruptions during the Holocene. The summit of roughly 65,000-year-old Stary Shiveluch is truncated by a broad 9-km-wide late-Pleistocene caldera breached to the south. Many lava domes occur on its outer flanks. The Molodoy Shiveluch lava dome complex was constructed during the Holocene within the large open caldera; Holocene lava dome extrusion also took place on the flanks of Stary Shiveluch. Widespread tephra layers from these eruptions have provided valuable time markers for dating volcanic events in Kamchatka. Frequent collapses of dome complexes, most recently in 1964, have produced debris avalanches whose deposits cover much of the floor of the breached caldera.

Sources: IOL News, Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)