Articles tagged "semisopochnoi"

semisopochnoi february 27 2020 f

Continuous tremor at Semisopochnoi volcano, Aviation Color Code raised to Orange, Alaska

Seismicity has been increasing over the last few days at Semisopochnoi volcano, Alaska and now is characterized by nearly continuous tremor and frequent small explosion signals. The situation represents a significant increase in activity and the Alaska Volcano...

March 16, 2020

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Series of small explosions and tremor bursts at Semisopochnoi volcano, alerts raised

A series of small explosions and tremor bursts have been detected in seismic data at Semisopochnoi over the past 7 hours and are continuing, representing a significant uptick in activity, the Alaska Volcano Observatory (AVO) reported at 09:19 UTC on February 15,...

February 15, 2020

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Eruption detected at Semisopochnoi volcano, Alaska

An eruption signature was detected at Semisopochnoi as strong tremor on local seismic and in regional infrasound networks on Adak Island, Alaska Volcano Observatory reported at 10:25 UTC on December 7, 2019. The event started at 09:26 UTC (00:26 AKST) on December 7...

December 07, 2019

mt cerberus semisopochnoi alaska 2017

Strong tremor signal at Semisopochnoi volcano, Aviation Color Code raised to Orange, Alaska

Elevated seismicity that began under Semisopochnoi volcano, Alaska on July 17, 2019, increased overnight and was followed by a stronger tremor signal recorded at 07:39 UTC, July 18. In addition, an infrasound signal was produced on an infrasound array located 260 km...

July 18, 2019

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Increased seismicity, alerts raised at Semisopochnoi volcano, Aleutians

Due to an increase in seismicity above background levels over at least the last 8 hours AVO is raising the Aviation Color Code to YELLOW and Alert Level to ADVISORY at Semisopochnoi. No explosive activity has been detected on the Adak infrasound array and clouds...

July 05, 2019

semisopochnoi island september 10 2018 esa sentinel 2 f

Eruptive events detected at Semisopochnoi, alerts raised to Orange/Watch, Alaska

Strong seismic tremor consistent with an eruption was recorded at Semisopochnoi volcano starting at 04:47 UTC (20:47 AKDT) on October 26, 2018. Satellite data through 05:00 UTC showed a small ash cloud at about 3.6 km (12 000 feet) above sea level, the Alaska...

October 28, 2018


Semisopochnoi volcano alert level raised, its previous eruptions were in 1987 and 1873, Alaska

The Alaska Volcano Observatory raised the Aviation Color Code for Semisopochnoi stratovolcano to Yellow and the Volcano Alert Level to Advisory on September 16, 2018. This is the largest subaerial volcano of the western Aleutians. It's 20 km (12.4 miles) wide at...

September 17, 2018


Increased seismic activity at Semisopochnoi volcano, Aleutian Islands

Earthquake activity at Semisopochnoi volcano, Aleutian Islands that began in January continues, and has increased in intensity over the past few days, Alaska Volcano Observatory (AVO) reports.In addition, AVO detected brief periods of seismic tremor, which can indicate

March 26, 2015

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Massive M7.9 earthquake struck Aleutian Islands, Alaska - tsunami warnings issued

A massive M7.9 earthquake (downgraded from M8.0) struck Aleutian Islands, Alaska on June 23, 2014, at 20:53 UTC. USGS is reporting depth of 107.5 km (66.8 miles). EMSC is reporting M7.9 at depth of 100 km.Epicenter was located 24 km (15 miles) S

June 23, 2014


Anomalous seismic activity reported at Semisopochnoi volcano, Alaska

A swarm of earthquakes started at Semisopochnoi volcano on June 9 and escalated on June 12 at approximately 20:00 UTC, the Alaska Volcano Observatory (AVO) reported yesterday.The continuation of this anomalous seismic activity prompted AVO to raise the Aviatio

June 14, 2014