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North Gorda Ridge volcano

Submarine volcano -3000 m / - 9,842 ft
United States, Northeastern Pacific Ocean, 42.67°N / -126.78°W
Current status: dormant (1 out of 5) | Reports
North Gorda Ridge volcano books
Typical eruption style: unspecified
North Gorda Ridge volcano eruptions: 1996  No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

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 North Gorda Ridge segment is located about 200 km west 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 North Gorda Ridge 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.
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Smithsonian / GVP volcano information


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