Shishaldin volcano (Aleutian Islands, Alaska): alert level raised, likely new lava dome growing incrater
The Alaska Volcano Observatory raised the alert level for the volcano to Aviation Color Code ORANGE and Alert Level WATCH: "Elevated surface temperatures were detected in satellite data beginning on March 18 and have persisted to the present time.
Sat, 29 Mar 2014, 10:0710:07 AM | BY: T
Analysis of this data shows that temperatures are consistent with the eruption of lava within the summit crater. 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.
Web camera images, satellite data and pilot observations over the past week show only minor steam emissions from the mountain's summit crater. There has been no evidence of ash emission.
Sound waves coupling into the ground (ground-coupled air waves) indicative of small explosions in the crater began to be seen in seismic data on March 18 and continue to be detected intermittently." (AVO)
Wed, 26 Mar 2014, 06:00
Shishaldin volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 26 March-1 April 2014 (New Activity / Unrest)
AVO reported that ground-coupled air waves from small explosions at Shishaldin's summit area were detected in seismic data during 25-27 March, although the energy and rate of occurrence both declined over that time. Elevated surface temperatures were identified in satellite images on 27 March. Based on the elevated surface temperatures and explosions persistent since 18 March AVO raised the Aviation Color Code to Orange and the Volcano Alert Level to Watch on 28 March. ... Read all
Wed, 19 Mar 2014, 06:00
Shishaldin volcano (Fox Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 19 March-25 March 2014 (Continuing Activity)
AVO reported that ground-coupled air waves from small explosions at Shishaldin's summit area were detected in seismic data during 19-25 March. Elevated surface temperatures were identified on most days during this period. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory. ... Read all