Semisopochnoi volcano news & activity updates:
Semisopochnoi volcano (Aleutian Islands, Alaska): small eruption this morning
Friday Oct 26, 2018 06:43 AM | BY: T
Seismic signal from Semisopochnoi volcano this morning, showing the eruption (image: AVO)A small eruption occurred at the volcano this morning (21:00 pm local time) and was detected in seismic data. The Alaska Volcano Observatory (AVO) reports:
"Strong seismic tremor from Semisopochnoi consistent with an eruption began at 4:47 UTC (20:47 AKDT) and is currently diminishing. Satellite data through 5:00 UTC (21:00 AKDT) show a small ash cloud at about 12,000 ft asl."
The alert level of the volcano was raised to orange. Semisopochnoi is monitored with an on-island seismic network, and remotely by satellite and lightning sensors.
An infrasound array on Adak Island could detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.
Friday, Oct 26, 2018
Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report: ... [more]
Semisopochnoi volcano (United States, Aleutian Islands) activity update: Eruption stopped, continuing seismicity
Friday, Oct 12, 2018
AVO has lowered the Aviation Color Code and Alert Level to YELLOW/ADVISORY due to satellite observations and a lack of tremor lately indicating that eruptive activity has stopped. Elevated seismicity continues. [more]
Semisopochnoi volcano (United States, Aleutian Islands) activity update: New eruption, minor ash emissions, new tephra cone
Wednesday, Oct 03, 2018
On September 16, AVO raised the volcano to Aviation Color Code YELLOW and Volcanic Alert Level ADVISORY due to increased seismicity. The following day, activity increased further, with bursts of tremor; AVO raised the Aviation Color Code to ORANGE and Volcanic Alert Level to WATCH. Subsequent satellite imagery showed ash deposits and a new tephra cone on the northern cone of Mount Cerberus, one of the cones of the volcanic system. No significant emissions have been detected. [more]
Tuesday, Jun 02, 2015
A decline in seismicity over the last few months and no sign of activity in daily satellite images prompts AVO to downgrade Semisopochnoi volcano from Aviation Color Code YELLOW and Volcanic Alert Level ADVISORY to UNASSIGNED. (USGS) [more]
Semisopochnoi volcano (Aleutian Islands) activity update: increased seismic activity, eruption warning
Thursday, Mar 26, 2015
The Alaska volcano observatory (AVO) detected significantly increased earthquake activity under the volcano and warns of a possible eruption: ... [more]