Cleft Segment

Cleft Segment is a fissure vent. It rises to −2,140 m above sea level. The GVP records 3 confirmed eruptions in the Holocene, the latest in 1986.

Elevation: −2,140 m
Last eruption: 1986
Confirmed eruptions: 3
Max VEI: 0
Countries: submarine, outside national borders
Location: 44.83° N, 130.30° W
Region (GVP): Northeast Pacific Rifts Volcanic Province
GVP type: Fissure vent(s)
Tectonic setting: Rift zone / Oceanic crust (< 15 km)
Main rock type: Basalt / Picro-Basalt

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Other volcanoes and strong earthquakes within 300 km

Eruption history

VEI – Volcanic Explosivity Index: 0 = lava outpouring, 4 = like Eyjafjallajökull 2010, 6 = like Pinatubo 1991, 7 = like Tambora 1815. The scale is logarithmic – each step is about 10 times more material.

Start	End	Vent and dating
16 August 1986	—	N Cleft Segment, S Juan de Fuca Ridge · Observations: Reported
c. 2 July 1982	—	N Cleft Segment, S Juan de Fuca Ridge · Observations: Reported
c. 270 BCE	—	S Cleft Segment, S Juan de Fuca Ridge · Isotopic: Uranium-series

Data: Global Volcanism Program, Smithsonian Institution (#331030)