Activity increases at Semisopochnoi

Earthquake activity has increased at Semisopochnoi in the Aleutian Islands. Heightened activity began in January and has progressed to the point where brief periods of seismic tremor have been observed. This may indicate movement of magma or volcanic gasses. While the current swarm has not yet surpassed the June – July 2014 swarm in amplitude … Continue reading Activity increases at Semisopochnoi