Report on Ebeko (Russia) — 26 January-1 February 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 26 January-1 February 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Ebeko (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 26 January-1 February 2005. Smithsonian Institution and US Geological Survey.
50.686°N, 156.014°E; summit elev. 1103 m
All times are local (unless otherwise noted)
Due to an increase in volcanic activity at Ebeko, on 30 January KVERT raised the Concern Color Code from Green to Yellow. On 27 and 28 January a strong sulfur scent was detected in the town of Severo-Kurilsk, ~7 km from Ebeko. On the 27th a gas-and-steam plume rose ~400 m above the volcano. During 28-29 January, a plume rose ~300 m above the vent on the on the NE side of the volcano's active crater. Ash deposits that were 2-3 mm thick were found 10 m from the vent. Ash extended about 500 m E. At this time a new 7x12-m turquoise lake emerged in the SW part of the active crater. The lake disappeared on 30 January, and there was intensive fumarolic activity where it had been. During the report period, shallow earthquakes were recorded at the Severo-Kurilsk seismic station.
Geologic Background. The flat-topped summit of the central cone of Ebeko volcano, one of the most active in the Kuril Islands, occupies the northern end of Paramushir Island. Three summit craters located along a SSW-NNE line form Ebeko volcano proper, at the northern end of a complex of five volcanic cones. Blocky lava flows extend west from Ebeko and SE from the neighboring Nezametnyi cone. The eastern part of the southern crater contains strong solfataras and a large boiling spring. The central crater is filled by a lake about 20 m deep whose shores are lined with steaming solfataras; the northern crater lies across a narrow, low barrier from the central crater and contains a small, cold crescentic lake. Historical activity, recorded since the late-18th century, has been restricted to small-to-moderate explosive eruptions from the summit craters. Intense fumarolic activity occurs in the summit craters, on the outer flanks of the cone, and in lateral explosion craters.