Great Sitkin volcano news & activity updates:
Great Sitkin volcano (Alaska): small earthquakes
Saturday Jul 22, 2017 12:05 PM | BY: T
An increase in seismic activity was detected at Great Sitkin starting with seismic tremor on July 21 16:17 AKDT (July 22 00:17 UTC). After about an hour, tremor transitioned to discrete earthquakes.
Small earthquakes continue at present at a much decreased rate of several per hour. No anomalous airwaves were detected at the Adak infrasound array, and nothing was observed in satellite data above weather cloud tops, which were at about 10,000 ft asl. AVO continues to monitor Great Sitkin with a local seismic network, distal infrasound networks and with satellite observations.