Report on Zhupanovsky (Russia) — 23 July-29 July 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 July-29 July 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, 23 July-29 July 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 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.
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.