Event Name : Semisopochnoi 2015/1
|Start:||January 2015 ± 14 Days||Observed|
|Stop:||April 2015 ± 1 Months||Observed|
|Seismicity with no confirmed eruption: ||
|Eruption Type:||Not an eruption.|
From Dixon and others, 2017: "An increase in seismicity at Semisopochnoi was recorded in January 2015, characterized by numerous small earthquakes, most with magnitudes less than ML=1. The seismicity continued for several months and when tremor associated with the earthquake swarm appeared, AVO raised the Aviation Color Code/Volcano Alert Level from UNASSIGNED to YELLOW/ADVISORY on March 25, 2015. After a decline in the seismicity over a period of several months, the Aviation Color Code and Volcanic Alert Level were downgraded to UNASSIGNED on May 28. Throughout the earthquake swarm, no deformation or associated thermal anomalies were observed."