KVERT reported moderate seismic activity from Karymsky during 17-27 August, and indicated that possible ash plumes rose to an altitude of 5.8 km (19,000 ft) a.s.l. on 25 August and to an altitude of 2.4 km (7,900 ft) a.s.l. on 27 August. Satellite imagery showed a daily thermal anomaly on the volcano. The Aviation Color Code remained at Orange.

Based on information from KEMSD, the Tokyo VAAC reported that on 25 August an eruption produced a plume that rose to an altitude of 5.8 km (19,000 ft) a.s.l. The altitude was based on seismic analysis.

Geological Summary. Karymsky, the most active volcano of Kamchatka's eastern volcanic zone, is a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during the early Holocene. The caldera cuts the south side of the Pleistocene Dvor volcano and is located outside the north margin of the large mid-Pleistocene Polovinka caldera, which contains the smaller Akademia Nauk and Odnoboky calderas. Most seismicity preceding Karymsky eruptions originated beneath Akademia Nauk caldera, located immediately south. The caldera enclosing Karymsky formed about 7600-7700 radiocarbon years ago; construction of the stratovolcano began about 2000 years later. The latest eruptive period began about 500 years ago, following a 2300-year quiescence. Much of the cone is mantled by lava flows less than 200 years old. Historical eruptions have been vulcanian or vulcanian-strombolian with moderate explosive activity and occasional lava flows from the summit crater.

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