Report on Zhupanovsky (Russia) — 23 October-29 October 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 October-29 October 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Zhupanovsky (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 October-29 October 2013. 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 a weak thermal anomaly over Zhupanovsky was detected on 23 October. The next day a phreatic eruption began at about 0300 and generated an ash plume that rose 5 km (16,400 ft) a.s.l. The ash plume was visible in satellite images drifting 40 km SE and S. Ash deposits about 10 cm thick were visible at the summit of the central part of the volcano, and deposits about 1 mm thick covered the Nalychevo Valley. The Aviation Color Code was raised to Orange. Ash plumes at 1635 and 2218 rose to altitudes of 2.5-3 km (8,200-10,000 ft) a.s.l. and drifted 120 km ESE and 25 km S, respectively. At 1134 on 25 October an ash plume rose 3 km (10,000 ft) a.s.l. and drifted 20 km NE. On 27 October KVERT noted that strong fumarolic activity and gas emissions continued, but that the phreatic explosions likely had ceased. The Aviation Color Code was lowered to Yellow, and then lowered again to Green on 29 October.
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.