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|1829-00-00||1830-00-00||Korovin: 1829 - 1830 || Grewingk (1850, translated 2003 by Fritz Jaensch) writes that Ingenstrom reported Korovin smoking in 1829 and 1830. Petroff (1884) reports Korovin as "in eruption and smoking" during 1829 and 1830. However, because Petroff (1884) is an incomplete translation of Grewingk (1850) the smoke-only reports are probably more accurate.
Additionally, the following account written by Bank and others (1950) may pertain to this eruption: "During the early eighteen hundreds Sarychef and Korovin volcanos ... More information||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=66&page=basic|
|1844-00-00||Korovin: 1844|| Grewingk (1850, translated 2003 by Fritz Jaensch) writes that Voznesenskii reported weak smoke from Korovin's crater in 1844.||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=67&page=basic|
|1907-00-00||Korovin: 1907|| Eakle (1908) reported "dense clouds of vapor" from the summit of Korovin. Jaggar (1927) reported "fresh volcanic cinder" on the snowfields near Mt. Kluichef during the same year, and a boiling spring. Hot springs and fumaroles are well-known in the vicinity of Korovin and Kliuchef, and this report may be nothing more than the usual fumarolic and hydrothermal activity.||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=68&page=basic|
|1951-11-00||Korovin: 1951|| Jones (1952) reports steaming from Korovin in November 1951. This steam may be from normal fumarolic and hydrothermal activity at Korovin, and not part of a volcanic eruption.||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=69&page=basic|
|1953-06-00||1954-7-00||Korovin: 1953 - 1954 || The following observations of Korovin are compiled from individual observation sheets filled out by members of the public and U.S. military.
19 June 1953: "Steam, slightly darker than low lying fog was spilling over northwestern lip - wind prevented formation of column. Snow on eastern face appeared to have been darkened by cinders of soot to almost black. It was not bare rock showing. It was a darkened snow coverage." -- observed by USCG ship Pioneer
25 June 1953: "All snow covering mountain ... More information||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=70&page=basic|
|1973-08-25||Korovin: 1973|| From Reeder (1988): "In the evening (just at dusk) of 25 (+/- 2) August 1973, eruptive activity was seen by numerous residents of Atka village while they were on a U.S. Navy harbor tug that was transporting them from Atka village to Adak. The harbor tug maintained a distance of about 9 km from the northern shore of Atka Island as it passed Korovin volcano. An incandescent 10+ m wide active lava-flow channel was observed that extended from a fissure vent the northern summit of Korovin volcano ... More information||exclamation.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=71&page=basic|
|1976-00-00||Korovin: 1976|| From Miller and others (1998): "'Smoke' was observed in 1976 at Korovin from Atka village, located 20 km to the south (Arctic Environmental Information and Data Center, 1978).||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=72&page=basic|
|1986-05-23||Korovin: 1986|| From Miller and others (1998): "Steam emission was observed in early May, 1986, and on May 23rd a 600 m steam plume containing some ash reportedly occurred soon after a 7.7 magnitude earthquake struck about 100 km to the southwest (Smithsonian Institution, 1986)."
From Smithsonian Institution (1986): "On 6 May], James Dickson noted a 500-m vertical steam plume over the SE part of the summit [of Korovin]. On 23 May at about 1730, Aleutian Air pilot Thomas Madsen noted a 600-m steam plume containing ... More information||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=73&page=basic|
|1987-03-04||1987-3-18||Korovin: 1987|| From Smithsonian Institution (1987): "On 18 March at 1954 a NOAA 10 satellite image showed three distinct plumes, each 95 km long, drifting ENE. The estimated vent locations were: 52.38°N, 174.15°W (Korovin's summit); 52.31°N, 174.24°W; and 52.29°N, 174.21°W (5.5 km WSW and 6.5 km SW of Mt. Kliuchef, a cone on Korovin's S flank). More accurate locations will be determined by USGS Anchorage. Just before midnight on the same day US Navy pilot Jeffrey Sullivan observed a southward-drifting ash plume ... More information||exclamation.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=74&page=basic|
|1996-06-29||Korovin: 1996|| From Neal and McGimsey (1997): "Following a pilot report of volcanic ash at 37,000 feet east of Adak, NOAA/SAB detected a plume-like cloud on an AVHRR image of the Atka Island area on June 29, 1996. Subsequent analysis and lack of any confirming observations of eruptions by pilots led AVO to the conclusion that the cloud was meterologic in nature. The cloud had suggested possible activity at Korovin, the most historically active stratocone on Atka Island in the central Aleutians (Marsh, 1991). ... More information||information.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=78&page=basic|
|1998-06-30||1998-6-30||Korovin: 1998|| From McGimsey and others (2003): "On the morning of June 30, 1998, AVO received a call from the Village Public Safety Officer (VPSO) in the village of Atka with a report of a dark ash cloud rising to 30,000 feet. The VPSO had observed two separate clouds, the first at approximately 07:30 local (Hawaii-Aleutian Time Zone is one hour behind ADT) and the second at approximately 08:30 local. The second cloud was the larger of the two reaching an estimated 30,000 ft and tinted orange ‘as if illuminated ... More information||exclamation.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=79&page=basic|
|2005-02-23||2005-5-7||Korovin: 2005|| From McGimsey and others (2007): "On the morning of February 24, 2005, AVO received a report from residents of Atka Village that Korovin had erupted the previous evening, producing a large steam and ash cloud. February 23 was a clear day and local residents had noticed minor steaming from Korovin about noon (see fig. 40 in original text). Then, about 7 p.m. HST (8 p.m. AST), they witnessed a dark plume over Korovin, rising several thousand feet high, drifting east, that had ash visibly falling ... More information||asterisk_yellow.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=532&page=basic|
|2005-09-13||2005-9-13||Korovin: 2005|| From McGimsey and others (2007): "On September 13, 2005, a long sequence of strong seismicity was recorded on the newly operational Korovin seismic network. The sequence began with two small local events followed by about 30 minutes of weak tremor, and then about 20 weak local events. Nothing unusual was detected on satellite images of the time period.
"Although a network of seismic stations was installed on northern Atka Island during the summer of 2004, data were not accessible until early ... More information||information.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=597&page=basic|
|2006-1-16||2007-9-00||Korovin: 2006 - 2007 ||From Neal and others (2009): "Beginning on January 16, a brief (minutes-long) increase over this background level was noted. Additional bursts of tremor-like signals occurred on January 17-18, 21, and February 21-22, prompting AVO to raise the Level of Concern Color Code to YELLOW. Satellite imagery of the volcano showed nothing unusual, although clouds frequently obscured the region. AVO did not receive reports of activity from residents of Atka Village, despite periods of clear weather in late ... More information||information.png||ye||50||http://www.avo.alaska.edu/volcanoes/activity.php?volcname=Korovin&eruptionid=608&page=basic|