Stepovak Bay Group
About Stepovak Bay Group
The Stepovak Bay Group is a chain of four cones, extending over a distance of 18 km, just SW of Kupreanof volcano. Stepovak Bay 2 is a cinder cone with a Holocene andesitic lava flow extending initially to the NE, then SE. The Stepovak Bay 3 cinder cone has a thick Holocene lava flow that originated from an ice-filled 300-m-wide crater and entered the same valley as the lava flow from Stepovak Bay 2 (Wilson, 1989); however, Wilson (in Wood and Kienle, 1990) noted uncertainty about this being Holocene activity. Stepovak Bay 4 is a small stratovolcano with Holocene debris flows or block-and-ash flows, and a fumarole has been observed. Stepovak Bay 1, the southwesternmost of the chain is Pleistocene, with K-Ar dates of about 0.53 and 0.4 million years (Wilson, 1989).
Eruption reports
Reports from GDACS and NASA EONET linked to this volcano.
No eruption reports in our records yet. New reports appear here automatically.
Earthquakes nearby, 30 days
Within about 50 km. Swarms of small quakes can sometimes accompany volcanic unrest.
No earthquakes recorded nearby in the last 30 days.