Volcano news: Karymsky
Karymski is getting more and more restless. Steam and ash eruptions with plume heights of up to 3,300m above the crater continue, while an increase in seismic activity is being recorded: according to news reports, a swarm of 130 tremors occurred under or near Karymsky volcano today and there are strong thermal anomalies as well. An escalation of the current eruption cannot be excluded to occur any time now.
Karymsky volcano is showing incread seismic activity. Moderate ash emissions send small plumes to up to 3,000 m (9,800 ft) a.s.l. traveling SW as observed by pilots. On 23 June, the alert level at Karymsky volcano was increased to Concern Color Code Orange....more
From the GVP/USGS Weekly Volcanic Activity Report, 1-7 June 2005:
As the Alaska Volcano Observatory reports, seismic activity and the height of ash explosions increased during the past week at Karymsky. Ash-and-gas plumes rose to ~3.5 km above the crater (16,500 ft a.s.l.) and fresh ash fell on the W and E sectors of the volcano. A thermal anomaly continues to be visible from satellite imagery.
Karymsky, the most active volcano of Kamchatka's eastern volcanic zone, is a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during the early Holocene. The caldera cuts the south side of the Pleistocene Dvor volcano and is located outside the north margin of the large mid-Pleistocene Polovinka caldera, which contains the smaller Akademia Nauk and Odnoboky calderas.
Most seismicity preceding Karymsky eruptions originated beneath Akademia Nauk caldera, which is located immediately south of Karymsky volcano. The caldera enclosing Karymsky volcano formed about 7600-7700 radiocarbon years ago; construction of the Karymsky stratovolcano began about 2000 years later. The latest eruptive period began about 500 years ago, following a 2300-year quiescence. Much of the cone is mantled by lava flows less than 200 years old. Historical eruptions have been vulcanian or vulcanian-strombolian with moderate explosive activity and occasional lava flows from the summit crater.
Source: GVP, Smithsonian Institution