Report on Chikurachki (Russia) — 1 February-7 February 2023
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
1 February-7 February 2023
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2023. Report on Chikurachki (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 1 February-7 February 2023. Smithsonian Institution and US Geological Survey.
50.324°N, 155.461°E; summit elev. 1781 m
All times are local (unless otherwise noted)
KVERT reported that the moderate explosive eruption at Chikurachki that began on 28 January continued through 2 February. Explosions during 28-29 and 31 January and 1-2 February produced ash plumes that rose to as high as 4 km (13,100 ft) a.s.l. and drifted 125 km SE, E, and NE based on satellite data. A thermal anomaly was identified in satellite images on 31 January. The Aviation Color Code remined at Orange (the second highest level on a four-color scale).
Geological Summary. Chikurachki, the highest volcano on Paramushir Island in the northern Kuriles, is a relatively small cone constructed on a high Pleistocene edifice. Oxidized basaltic-to-andesitic scoria deposits covering the upper part of the young cone give it a distinctive red color. Frequent basaltic Plinian eruptions have occurred during the Holocene. Lava flows have reached the sea and formed capes on the NW coast; several young lava flows are also present on the E flank beneath a scoria deposit. The Tatarinov group of six volcanic centers is located immediately to the south, and the Lomonosov cinder cone group, the source of an early Holocene lava flow that reached the saddle between it and Fuss Peak to the west, lies at the southern end of the N-S-trending Chikurachki-Tatarinov complex. In contrast to the frequently active Chikurachki, the Tatarinov centers are extensively modified by erosion and have a more complex structure. Tephrochronology gives evidence of an eruption around 1690 CE from Tatarinov, although its southern cone contains a sulfur-encrusted crater with fumaroles that were active along the margin of a crater lake until 1959.