An earthquake swarm, either related to tectonic processes or volcanic unrest, began in the vicinity of Davidof on 24 January. The swarm continued at low levels during 1-8 February with daily small earthquakes. The Aviation Color Code remained at Yellow and the Volcano Alert Level remained at Advisory.

Geological Summary. A cluster of small islands between Segula and Little Sitkin in the western Aleutians, the largest of which is Davidof, are remnants of a stratovolcano that collapsed during the late Tertiary, forming a 2.7-km-wide caldera. The islands include Khvostof, Pyramid, Lopy, and Davidof; the latter three form the eastern rim of the mostly submarine caldera, sometimes referred to as the "Aleutian Krakatau." The islands were constructed above a roughly 100-m-deep submarine platform extending NW to Segula Island; the floor of the caldera lies 80 m below sea level. The islands are vegetated, but lava flows are recognizable, and Smith et al. (1978) suggested a possible Holocene age.

Source: US Geological Survey Alaska Volcano Observatory (AVO)