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Undersea features · Fissure vent

Cleft Segment

Type
Fissure vent
Elevation
2140m (submarine)
Last eruption
1986
These black smoker vents are located along the Cleft Segment, the southernmost segment of the Juan de Fuca Ridge. These sustained high-temperature vents were photographed along fissures that fed an older lava flow adjacent to a 1986 lava flow that was erupted during the second of two documented submarine eruptions in the 1980s. The 80-km-long Cleft Segment is located immediately north of the Blanco Fracture Zone about 500 km off the Oregon coast.
These black smoker vents are located along the Cleft Segment, the southernmost segment of the Juan de Fuca Ridge. These sustained high-temperature vents were photographed along fissures that fed an older lava flow adjacent to a 1986 lava flow that was erupted during the second of two documented submarine eruptions in the 1980s. The 80-km-long Cleft Segment is located immediately north of the Blanco Fracture Zone about 500 km off the Oregon coast. · Photo: Image courtesy of National Oceanic and Atmospheric Administration (http://www.pmel.noaa.gov/vents/home.html).
Type
Fissure vent
Country
Undersea features
Region
Eastern Pacific / Northeast Pacific Rifts Volcanic Province
Elevation
2140m (submarine)
Coordinates
44.830, -130.300
Last eruption
1986
Tectonic setting
Rift zone / Oceanic crust (< 15 km)
Landform
Cluster
Major rock type
Basalt / Picro-basalt

Geological summary

The Cleft Segment, the southernmost of the Juan de Fuca Ridge, lies immediately north of the Blanco Fracture Zone.

Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →

Eruption history

3 recordedGlossary

Record summary

Confirmed eruptions
3
Uncertain eruptions
0
Span of confirmed record
270 BCE – 1986
Largest confirmed eruption
VEI 0 (1986, the most recent of 3)
Confirmed eruptions since 1900
2
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
270 BCE~82 BCE · 1 eruptions · max VEI 01798~1986 · 2 eruptions · max VEI 0270 BCE29485812341798

Detailed timeline

  1. 1986VEI 0Observed
    1986-08-16 – end unknown
    N Cleft Segment, S Juan de Fuca Ridge
  2. 1982VEI 0Observed
    1982-07-02 – end unknown
    N Cleft Segment, S Juan de Fuca Ridge
  3. 270 BCEVEI 0Geological estimate
    270 BCE – end unknown
    S Cleft Segment, S Juan de Fuca Ridge

Nearby volcanoes

External links

⚠ For reference only. Not for emergency response.