Cobb Segment
About Cobb Segment
The Cobb Segment is in the northern part of the Juan de Fuca Ridge, south of the Endeavour Ridge segment. This 150-km-long segment, also known as the Northern Symmetrical or NSymm Segment, is the longest of the Juan de Fuca Ridge. It has a narrow axial crest, 1-2 km wide, with a shallow graben that has a high point at about 2,300 m depth. A prominent seamount with hydrothermal deposits at its summit lies just west of the axis high and was the source of a broad area of young, mostly sediment-free lava flows. As with other Juan de Fuca Ridge segments, a shallow magma source is thought to underlie the Cobb Segment, and a preliminary Uranium-series date of Holocene age was obtained on a basaltic lava flow.
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.