KVERT reported that during 19-25 July the moderate explosive eruption continued at Zhupanovsky. On 18 and 21 July satellite data showed ash plumes that rose to 4 km (13,100 ft) a.s.l. and extended about 30 and 70 km NE, respectively. A thermal anomaly was observed over the volcano on 19 and 21 July. Tokyo VAAC reported an ash plume on 27 July that rose to 8.5 km (28,000 ft) a.s.l. and drifted N.

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)