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OUT OF MIND » CHANGING ENVIRONMENT & NATURE » EARTH CHANGES » Fourth explosive eruption at Bogoslov volcano, Alaska

Fourth explosive eruption at Bogoslov volcano, Alaska

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PurpleSkyz

PurpleSkyz
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Fourth explosive eruption at Bogoslov volcano, Alaska

Posted by TW on December 27, 2016 in category Volcanoes

Fourth explosive eruption at Bogoslov volcano, Alaska Bogoslof-volcano-eruption-december-26-2016-satellite-image

 

Bogoslof volcano in the Aleutian Islands of Alaska remains in a state of elevated unrest following the fourth explosive eruption since the current eruptive sequence began on December 21, 2016. 
Retrospective analysis of seismic, infrasound, and satellite data performed by Alaska Volcano Observatory (AVO) suggest that following the initial increase in seismicity around 23:05 UTC on December 26, a fourth explosive ash emission started at about 23:30 UTC and lasted for approximately one hour. Windy conditions on Umnak Island appear to be obscuring Bogoslof's volcanic signal on seismic instruments there since about 00:20 UTC on December 27, limiting seismic detection capabilities.
AVO said satellite images showed the plume from yesterday's event rose to about 9.1 km (30 000 feet) above sea level and was carried to the northeast by prevailing winds. 
Although explosive activity has subsided at present, based on the unpredictability of the situation the status of the volcano remains at Aviation Color Code Red and Alert Status Warning.
Fourth explosive eruption at Bogoslov volcano, Alaska Bogoslof-eruption-december-26-2016-satellite-image-big
Bogoslof volcano eruption on December 26, 2016. Credit: NOAA
Fourth explosive eruption at Bogoslov volcano, Alaska Bogoslof-eruption-december-23-2016-visual
Bogoslof volcano eruption on December 23, 2016. Credit: CGC/Alex Haley
AVO has no ground-based volcano monitoring equipment on Bogoslof volcano.
"We continue to monitor satellite images, data from distant seismic and infrasound instruments, and information from the Worldwide Lightning Location Network for indications of significant activity," the observatory said.

Geological summary

Bogoslof is the emergent summit of a submarine volcano that lies 40 km north of the main Aleutian arc. It rises 1500 m above the Bering Sea floor. Repeated construction and destruction of lava domes at different locations during historical time has greatly modified the appearance of this "Jack-in-the-Box" volcano and has introduced a confusing nomenclature applied during frequent visits of exploring expeditions.
The present triangular-shaped, 0.75 x 2 km island consists of remnants of lava domes emplaced from 1796 to 1992. Castle Rock (Old Bogoslof) is a steep-sided pinnacle that is a remnant of a spine from the 1796 eruption. Fire Island (New Bogoslof), a small island located about 600 m NW of Bogoslof Island, is a remnant of a lava dome that was formed in 1883. (GVP)
Featured image: Bogoslof volcano eruption on December 26, 2016. Credit: NOAA


Thanks to: https://watchers.news



  

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