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Mount Pavlof
Pavlof Volcano is a stratovolcano of the Aleutian Range on the Alaska Peninsula. It has been one of the most active in the United States since 1980, with eruptions recorded in 1980, 1981, 1983, 1986–1988, 1996–1997, August 15 to September 13, 2007, May 13 to August 8, 2013, and most recently May 31, 2014 and continuing as of June 3, 2014.〔〔(【引用サイトリンク】url=https://www.avo.alaska.edu/activity/Pavlof.php )〕〔 The Alaska Volcano Observatory reports on Pavlof Aviation Color Code levels and Volcano Alert levels on a daily basis.〔(Alaska Volcano Observatory Daily Update ) Alaska Volcano Observatory. The AVO is a joint program of the United States Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS).〕 With a threat score of 95,〔John W. Ewert, Marianne Guffanti, and Thomas L. Murray. (An Assessment of Volcanic Threat and Monitoring Capabilities in the United States: Framework for a National Volcano Early Warning System. ) United States Geological Survey, April 2005.〕 the threat from future eruptions is considered to be high; much of this threat comes from the possibility of disruption of nearby air routes by large releases of ash.〔 The mountain currently has basic real-time monitoring, but the USGS would like to improve instrumentation at the site.〔 The mountain shares a name with the nearby Pavlof Sister, which last erupted in 1786.
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== Geologic activity ==
After its eruption in 1996, the volcano entered a period of dormancy, the longest it had been dormant since records of its eruptions have been kept. This period ended on August 15, 2007, with the start of a new eruption involving seismic disturbances and a "vigorous eruption of lava."〔 Scientists said that the volcano "could be working toward a massive eruption that could affect air travel but was not expected to threaten any of the towns in the area."〔 The eruption ended on September 13.〔 The volcano erupted again on May 13, 2013,〔 but activity had greatly diminished by July 3, 2013, and on August 8, 2013, the Current Volcano Alert Level was reduced to NORMAL and the Current Aviation Color Code reduced to GREEN.〔
A new low-level eruption began on May 31, 2014. On June 2 seismic activity intensified and officials raised the alert level from "Watch" to "Warning" and the aviation color code from "Orange" to "Red" after pilots in the area reported a smoke plume that reached as high as 22,000 feet above sea level.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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