North Gorda Ridge

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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 42.67°N
  • 126.78°W

  • -3000 m
    -9840 ft

  • 331031
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for North Gorda Ridge.

 Available Weekly Reports

There are no Weekly Reports available for North Gorda Ridge.

Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1996 Feb 28 (?) 1996 Mar 15 (?) Confirmed 0 Historical Observations Near center of North Gorda Ridge segment
3020 BCE (?) Unknown Confirmed 0 Uranium-series
4840 BCE (?) Unknown Confirmed 0 Uranium-series

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Chadwick W W Jr, Embley R W, Shank T M, 1998. The 1996 Gorda Ridge eruption: geologic mapping, sidescan sonar, and SeaBeam comparison results. Deep-Sea Res II, 45: 2547-2569.

Goldstein S J, Murrell M T, Janecky D R, Delaney J R, Clague D A, 1992. Geochronology and petrogenesis of MORB from the Juan de Fuca and Gorda ridges by 238U-230Th disequilibrium. Earth Planet Sci Lett, 109: 255-272.

Perfit M R, Chadwick W W Jr, 1998. Magmatism at Mid-Ocean ridges: constraints from volcanological and geochemical investigations. In: Buck W R, Delaney P T, Karson J A, Lagabrielle Y (eds) Faulting and Magmatism at Mid-Ocean Ridges {Amer Geophys Union Geophys Monograph} 106: 59-115.

Rubin K H, Smith M C, Perfit M R, Christie D M, Sacks L F, 1998. Geochronology and geochemistry of lavas from the 1996 North Gorda Ridge eruption. Deep-Sea Res II, 45: 2571-2597.

Smithsonian Institution-GVN, 1990-. [Monthly event reports]. Bull Global Volc Network, v 15-33.

Volpe A M, Goldstein S J, 1993. 236Ra-230Th disequilibrium in axial and off-axis mid-oecan ridge basalts. Geochim Cosmochim Acta, 57: 1233-1241.

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.