Report on Ebeko (Russia) — November 1989
Scientific Event Alert Network Bulletin, vol. 14, no. 11 (November 1989)
Managing Editor: Lindsay McClelland.
Ebeko (Russia) Mild explosions eject ash to 800 m
Please cite this report as:
Global Volcanism Program, 1989. Report on Ebeko (Russia). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 14:11. Smithsonian Institution.
50.686°N, 156.014°E; summit elev. 1103 m
All times are local (unless otherwise noted)
Mild explosive activity from the NW portion of Ebeko's N crater was reported in August and September. . . . activity from a vent 100 m across and 50 m deep occurred at 1-3-hour intervals. Ash was ejected to 800 m. No juvenile material was found in the tephra. Volcaniclastic bombs (<=0.2 m) were ejected onto the crater slopes within 500 m of the vent. The position of the observers was not known, but the only audible explosion occurred 23 September at 1422.
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.
Information Contacts: B. Ivanov, IV.