Report on Zhupanovsky (Russia) — 20 August-26 August 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 August-26 August 2014
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2014. Report on Zhupanovsky (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 20 August-26 August 2014. Smithsonian Institution and US Geological Survey.
53.589°N, 159.15°E; summit elev. 2899 m
All times are local (unless otherwise noted)
KVERT reported that during 15-21 August that moderate explosive eruption continued at Zhupanovsky. Satellite data showed a thermal anomaly over the volcano on 16-17 August. On 18 and 15 August the volcano was obscured by clouds. The Tokyo VAAC reported ash plumes rose to 3-4.5 km (10,000-15,000 ft) a.s.l. and drifted S and SSE. On August 19 KVERT reported that satellite data showed ash plumes drifted 51 km S of the volcano and on August 20 that ash plumes rose to 3 km (9800 ft) a.s.l. and drifted 110 km SSE.
Geologic Background. The Zhupanovsky volcanic massif consists of four overlapping stratovolcanoes along a WNW-trending ridge. The elongated volcanic 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, the fourth is Holocene in age and was the source of all of Zhupanovsky's historical eruptions. An early Holocene stage of frequent moderate and weak eruptions from 7000 to 5000 years before present (BP) was succeeded by a period of infrequent larger eruptions that produced pyroclastic flows. The last major eruption took place about 800-900 years BP. Historical eruptions have consisted of relatively minor explosions from the third cone.