North Gorda Ridge Segment

sopka – Fissure vent(s), United States, Eastern Pacific Volcanic Regions

Kde

United States, Eastern Pacific Volcanic Regions

Typ (GVP)

Fissure vent(s)

Nadmořská výška

-3 000 m

Tektonické prostředí

Rift zone / Oceanic crust (< 15 km)

Poslední známá erupce

1996

Poloha

42,670°, -126,780°

The northernmost of five segments of the Gorda Ridge lies immediately south of the Blanco Transform Fault that offsets the Gorda and Juan de Fuca oceanic spreading ridges. The 65-km-long segment is located about 200 km W of the southern Oregon coast and has deep 5- 10-km-wide valleys at either ends with a shallower narrow axial valley at the center. This morphology, which in plan view resembles an hourglass, is typical of magmatically active spreading segments. A submarine lava flow was erupted in late February and early March 1996, near the center of the segment. The eruption was initially detected through acoustic T-waves from a seismic swarm and the emission of large thermal plumes. In April submarine cameras revealed new lava flows about 100-200 m wide along a fissure that was at least 3.5 km long. A seismic swarm of uncertain origin also occurred at this location in January 1998.

Text: Smithsonian Global Volcanism Program.

Údaje o sopce: Smithsonian Global Volcanism Program. Další sopky a průduchy.