This article documents a current event. Information may change rapidly as the event progresses.

Fagit Mountain
Fumaroles escape from Fourpeaked volcano through a fissure in Fourpeaked Glacier on 24 September 2006
Elevation	6,903 feet (2,104 metres)
Location	Alaska, USA
Range	Aleutian Range
Coordinates	58°46′N, 153°40′W
Topo map	USGS Afognak
Type	Stratovolcano
Age of rock	> 10,000 years
Last eruption	2006-2007

Fourpeaked Mountain also known as Fourpeaked volcano is an active stratovolcano in Alaska. The Alaska Volcano Observatory currently rates Fourpeaked as Aviation Alert Level Yellow and Volcanic-alert Level Advisory. It is nearly completely covered by Fourpeaked Glacier. It was long a dormant volcano until it entered a new phase of activity on September 17, 2006. It is located in southwestern Alaska, approximately 200 miles southwest of Anchorage, Alaska and 80 miles northwest of Kodiak Island. It lies within the Katmai National Park and Preserve on the Alaska Peninsula. Image File history File links Current_event_marker. ... Image File history File links No higher resolution available. ... Sulfur deposits near a fumarole A fumarole (Latin fumus, smoke) is an opening in Earths (or any other astronomical bodys) crust, often in the neighborhood of volcanoes, which emit steam and gases such as carbon dioxide, hydrochloric acid, and hydrogen sulfide. ... Fourpeaked Glacier is a tidewater glacier covering much of Fourpeaked Mountain, also known as Fourpeaked Volcano. ... September 24 is the 267th day of the year (268th in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... A topographical summit is a point on a surface which is higher in elevation than all points immediately adjacent to it. ... Official language(s) none Capital Juneau Largest city Anchorage Area  Ranked 1st  - Total 663,267 sq mi (1,717,855 km²)  - Width 808 miles (1,300 km)  - Length 1,479 miles (2,380 km)  - % water 13. ... The Himalaya as seen from the International Space Station A mountain range is a group of mountains bordered by lowlands or separated from other mountain ranges by passes or rivers. ... The Aleutian Range is the mountain range of the Alaska Peninsula in southeast Alaska. ... Map of Earth showing lines of latitude (horizontally) and longitude (vertically), Eckert VI projection; large version (pdf, 1. ... Example of a topographic map with contour lines Part of the same map in a perspective shaded relief view illustrates how the contour lines of the original follow the terrain Topographic maps are a variety of map characterized by large-scale detail and quantitative representation of relief, usually using contour... InsertSLUTTY WHORES≤ non-formatted text here{| class=toccolours border=1 cellpadding=4 style=float: right; margin: 0 0 1em 1em; width: 20em; border-collapse: collapse; font-size: 95%; clear: right; |+ United States Geological Survey |- |style= align=center colspan=2| [[Image:USGS logo. ... Mountains can be characterized in several ways. ... A cutaway diagram of a stratovolcano Mount Damavand, a stratovolcano in Māzandarān, Iran Mount St. ... // For other uses, see time scale. ... For other uses, see Volcano (disambiguation). ... For the Manfred Mann album, see 2006 (album). ... 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... A cutaway diagram of a stratovolcano Mount Damavand, a stratovolcano in Māzandarān, Iran Mount St. ... The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS). ... Three parallel Volcano warning schemes are used by the United States Geological Survey for different volcano ranges in the United States. ... Three parallel Volcano warning schemes are used by the United States Geological Survey for different volcano ranges in the United States. ... Fourpeaked Glacier is a tidewater glacier covering much of Fourpeaked Mountain, also known as Fourpeaked Volcano. ... Towering over the city of Naples, Vesuvius is dormant but certainly not extinct A dormant volcano is a volcano which is not currently erupting, but is believed to still be capable of erupting in the future. ... September 17 is the 260th day of the year (261st in leap years). ... For the Manfred Mann album, see 2006 (album). ... Official language(s) none Capital Juneau Largest city Anchorage Area  Ranked 1st  - Total 663,267 sq mi (1,717,855 km²)  - Width 808 miles (1,300 km)  - Length 1,479 miles (2,380 km)  - % water 13. ... Nickname: Motto: BIG WILD LIFE Location in the state of Alaska Coordinates: Borough Municipality of Anchorage Government  - Mayor Mark Begich (D) Area  - City 5,079. ... Kodiak Island is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait. ... Katmai National Park and Preserve is a United States National Park in Alaska, notable for the Valley of Ten Thousand Smokes and for its brown bears. ... Volcanoes on the Alaska Peninsula The Alaska Peninsula is a peninsula extending about 800 km (500 miles) to the southwest from the mainland of Alaska and ending in the Aleutian Islands. ...

Fourpeaked Mountain, September 17, 2006

AVO map shows the location of Fourpeaked volcano

Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ...

History

Prior to the phase that began September 17, 2006, Fourpeaked had been dormant for over 10,000 years, meaning its last known eruption was prior to 7994 BC.[1] September 17 is the 260th day of the year (261st in leap years). ... For the Manfred Mann album, see 2006 (album). ...

September 17, 2006

Pilots and other civilians reported two distinct and very large steam plumes coming from Fourpeaked volcano. They were seen as far away as Homer, Alaska located northeast of Fourpeaked across Cook Inlet. Scientists on subsequent flights by USGS/AVO have discovered that volcanic gases are being vented "vigorously" near the summit. Air sampling has confirmed these findings. September 17 is the 260th day of the year (261st in leap years). ... For the Manfred Mann album, see 2006 (album). ... Homer is a town located in Kenai Peninsula Borough in the U.S. state of Alaska. ... Cook Inlet, showing Knik and Turnagain Arms The Cook Inlet or Nuti Inlet is a large inlet of the Gulf of Alaska in south-central Alaska. ...

September 20, 2006

The Alaska Volcano Observatory upgraded Fourpeaked from the classification "not assigned" to Level of Concern Color Code Yellow on September 20, 2006. This color coded system was later renamed the Aviation Alert Level, but with the same color coding system. They also began installing seismic monitoring equipment on the mountain and using fixed-wing aircraft as well as helicopters to monitor the volcano. September 20 is the 263rd day of the year (264th in leap years). ... For the Manfred Mann album, see 2006 (album). ... The Alaska Volcano Observatory (AVO) is a joint program of the United States Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS). ... The Alaska Volcano Observatory uses the following color coded system to rate volcanic activity: NOT ASSIGNED The volcano has not been assigned a Level of Concern Color Code and is not actively monitored. ... September 20 is the 263rd day of the year (264th in leap years). ... For the Manfred Mann album, see 2006 (album). ... Three parallel Volcano warning schemes are used by the United States Geological Survey for different volcano ranges in the United States. ... This article needs additional references or sources to facilitate its verification. ... A helicopter is an aircraft which is lifted and propelled by one or more horizontal rotors consisting of two or more rotor blades. ...

September 25, 2006 AVO eruption warning

On September 25, 2006, the AVO released the following information as part of a special information release: September 25 is the 268th day of the year (269th in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... September 25 is the 268th day of the year (269th in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ...

"...Based on all currently available evidence, AVO believes that an eruption from Fourpeaked in the next days to weeks is possible. Given below are some possible future scenarios for the current unrest at Fourpeaked, listed in order, with the most likely scenario listed first:

(1) A small to moderate eruption will occur, which may produce ash plumes exceeding 10 km (33,000 ft) above sea level. Lava flows may also occur. (2) No eruption occurs. Unrest gradually subsides to background levels. (3) A large eruption will occur, which would produce ash plumes exceeding 10 km (33,000 ft) above sea level, and possible widespread ash fall."

October 3, 2006

The Alaska Volcano Observatory completed installation of another seismometer near Fourpeaked. Almost immediately they detected an earthquake swarm of lower magnitude quakes. This behavior has continued intermittently through the present. Fourpeaked also continues to vent volcanic gasses at the same rate as revealed in earlier air sampling. October 3 is the 276th day of the year (277th in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... Global earthquake epicenters, 1963–1998. ...

February 2007

Fourpeaked Mountain with active fumaroles and sulfur deposits on February 22, 2007

In February, 2007 Fourpeaked began showing a relatively small but noticeable increase in activity. The Alaska Volcano Observatory reported February 8-9 that: "Three small explosive events were recorded by seismic and acoustic instruments Thursday and Friday (February 08-09) beginning at 10:36 AM AKST (1936 UTC) February 08. A possible large steam plume was observed in several partly cloudy satellite views Thursday afternoon." On February 18, the AVO reported a swarm of 13 small earthquakes under Foupeaked, with the largest measuring 1.8 on the Richter Scale. On February 23, the AVO conducted a gas flight and detected the continued emission of sulfur dioxide (SO2). As of February 24, the rating for the mountain remains at Yellow/Advisory. This article or section does not adequately cite its references or sources. ... 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... The Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. ... Sulfur dioxide (or Sulphur dioxide) has the chemical formula SO2. ...

March 2007

The Alaska Volcano Observatory began reporting in its Daily Update on Fourpeaked volcano that "several small explosion signals" were detected overnight, apparently continuing the series of small explosions which began on February 8. These "small explosions" have continued daily through March 12. March is the third month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days. ... 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ...

References

• Smithsonian Institution Global Volcanism Program: Fourpeaked
• Alaska Volcano Observatory: Fourpeaked

External links

• United States Geological Survey
• UAF Geophysical Institute
• Alaska Division of Geological and Geophysical Surveys