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Fourpeaked volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 20 September-26 September 2006 (New Activity / Unrest)

Mi, 20. Sep 2006, 06:00
06:00 AM | VON: VN
On the evening of 17 September the Alaska Volcano Observatory (AVO) received several reports of two discrete plumes rising from the Cape Douglas area, about 320 km SW of Anchorage. Retrospective analysis of data from the NEXRAD Doppler radar in King Salmon showed an unusual cloud starting at 1200 that day. The maximum cloud height determined by radar during the first hour of the event was 6 km (20,000 ft) a.s.l.
The radar return from the cloud continued until at least 2145. A cloud of sulfur dioxide gas was observed by colleagues at the University of Maryland Baltimore County over the Cape Douglas/Fourpeaked region at 1500 using data collected by the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite. On this basis all of the clouds were inferred to be volcanic in origin.
Although satellite data did not detect ash during this event, AVO received reports of a trace of ashfall at Nonvianuk Lake outlet (110 km WNW) and near Homer (150 km NE).

Both fixed-wing and helicopter overflights in the Cape Douglas area 20 September confirmed the source of volcanic activity to be Fourpeaked volcano. AVO raised the Level of Concern Color Code from "Not Assigned" to YELLOW on 20 September. Fourpeaked and Douglas volcanoes are not monitored seismically.
A 23 September observation flight conducted in relatively good weather permitted the first look at the summit since the event of 17 September. Observers saw a linear series of vents running N from the summit for about 1 km. Most of these vents were vigorously emitting steam and other volcanic gases.
Gas measurements indicated abundant quantities of sulfur dioxide, hydrogren sulfide, and carbon dioxide.

Source: US Geological Survey Alaska Volcano Observatory (AVO)
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From: Global Volcanism Program, 2006. Report on Fourpeaked. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 20 September-26 September 2006. Smithsonian Institution and US Geological Survey.

Vorherige Nachrichten

Sa, 26. Feb 2005, 01:49

Fourpeaked Volcano (Alaska), eruption news: first known eruption

Aerialphoto of the summit of Fourpeaked volcano on an overflight on the 24th of Sep 2006 showing several steaming vents on its summit. (Photo courtesy: Cyrus Read, AVO/USGS)
The first known historic eruption of Fourpeaked volcano on the Alaska peninsula is taking its course. Several vents emitting gasses and ash have appeared on the glacier-topped volcano and are slowly melting the ice cap. ... Read all
Fourpeaked Vulkan
Stratovolcano 2105 m / 6,906 ft
United States, Alaska Peninsula, 58.77°N / -153.67°W
Aktueller Status: normal / ruhend (1 von 5) Ausbrüche des Fourpeaked:
2006 
Typische Aktivität
unspecified
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