North Sister volcano's east face (750 m, 2460 ft high) consists of ...
By Volcano Hazards Program
2007 (approx.)
Detailed Description
East face of North Sister, 750 m high. Consists of about 100 thin mafic lava flows and intercalated layers of red scoria, capped by thick summit lava flows. Remnant of Thayer Glacier feeds cirque lake. Pervasively altered yellow-orange buttress on right, 250 m thick, consists of east-dipping, palagonitized, ash-rich fragmental flow deposits.
Sources/Usage
Public Domain.
Hildreth et al., 2013 Photograph by John Scurlock.
Related
Eruption History for North Sister
North Sister is the oldest and longest active volcano of the Three Sisters, and its period of construction from about 120 to 45 ka occurred after the eruptions of Broken Top ended.
Related
Eruption History for North Sister
North Sister is the oldest and longest active volcano of the Three Sisters, and its period of construction from about 120 to 45 ka occurred after the eruptions of Broken Top ended.