KVERT reported that during 8-14 August the moderate explosive eruption continued at Zhupanovsky. On 8 August staff of Volcanoes of Kamchatka Natural Park observed ash explosions twice an hour, with ash plumes rising up to 4 km (13,100 ft)a.s.l. drifting E. On 8 and 11-13 August satellite data showed that ash plumes rose to 4-4.5 km (13,100-14,800 ft)a.s.l. and drifted 80-100 km SE and NE Other days satellite data showed the volcano was obscured by clouds. On 12-13 August the Tokyo VAAC reported ash plumes to 3-4.9 km (10,000-16,000 ft) a.s.l that drifted SE, NE, and ESE.

Geological Summary. The Zhupanovsky volcanic massif consists of four overlapping stratovolcanoes along a WNW-trending ridge. The elongated complex was constructed within a Pliocene-early Pleistocene caldera whose rim is exposed only on the eastern side. Three of the stratovolcanoes were built during the Pleistocene. An early Holocene stage of frequent moderate and weak eruptions from 7,000 to 5,000 years before present (BP) was followed by a period of infrequent larger eruptions that produced pyroclastic flows. The last major eruption took place about 800-900 BP. Recorded eruptions have consisted of relatively minor explosions from Priemysh, the third cone from the E about 2.5 km from the summit peak.

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