AK Beat: With lava in crater, alert level for volcano in Aleutian Islands bumped up

Alaska Beat

March 28, 2014

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Mount Shishaldin in Alaska's Aleutian Islands during a 1999 eruption. Game McGimsey / AVO/USGS

With lava in crater, Shishaldin bumped to code orange: Observers at the Alaska Volcano Observatory raised the aviation color code for Mount Shishaldin from yellow to orange, and the alert level to “watch,” the second-highest level, on Friday. The move came after data from satellites showed an increase in surface temperatures on the Unimak Island volcano, beginning March 18. “Analysis of this data shows that temperatures are consistent with the eruption of lava within the summit crater,” the AVO wrote. “The current activity appears to be confined to the deep summit crater and there have been no observations of lava on the flanks of the volcano or surrounding the summit crater.” The observers also said there was only minor steam emission and no ash emission. Shishaldin had been on at a yellow alert level since Jan. 30. In 1999, the volcano, in the eastern Aleutians, erupted sending a cloud of ash and steam 45,000 feet into the atmosphere.

http://www.alaskadispatch.com/article/20140328/ak-beat-lava-crater-alert-level-volcano-aleutian-islands-bumped

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Reventador volcano, Ecuador: news & activity updates

Reventador volcano (Ecuador): elevated activity, lava flows and ash emissions

Saturday Mar 29, 2014 | BY: T

Overlaying of thermal and visible images showing the new lava flows on Reventador (image: F. Vásconez , IG)

Current seismic signal from Reventador (CONE station, IGPEN)

The volcano's activity has remained high since the beginning of the current eruptive phase since 25 March. Fresh lava continues to extrude at the summit crater, adding to the dome that had been active since 2011, and producing incandescent avalanches, small pyroclastic flows on its flanks and ash emissions.
Seismic activity has remained at high levels, showing continuous tremor and emissions signals. IGPEN reports that the pyroclastic flows on the E, SE and S flanks have traveled up to 1.5 km from the summit. Additionally, there seems to be at least 2 lava flows that descend the south-eastern and eastern flank of the volcano, with fronts reaching approx. 500 m distance.

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http://www.volcanodiscovery.com/reventador/news/43523/Reventador-volcano-Ecuador-elevated-activity-lava-flows-and-ash-emissions.html