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Axial Seamount volcano

Updated: Feb 5, 2023 01:26 GMT -
Submarine volcano -1410 m / - 4,626 ft
Northeastern Pacific Ocean, Juan de Fuca Ridge, 45.95°N / -130°W
Current status: normal or dormant (1 out of 5)
Last update: 20 Dec 2021 (submarine eruption since 23 April 2015)

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Typical eruption style: effusive (lava flows)
Axial Seamount volcano eruptions: 2015, 1998

Latest nearby earthquakes

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Background

Axial Seamount rises 700 m above the mean level of the central Juan de Fuca Ridge crest about 480 km west of Cannon Beach, Oregon to within about 1400 m of the sea surface. The volcano is the most magmatically robust and seismically active site on the Juan de Fuca Ridge between the Blanco Fracture Zone and the Cobb offset. The summit is marked by an unusual rectangular-shaped caldera (3 x 8 km) that lies between two rift zones. The caldera is breached to the SE and is defined on three sides by boundary faults of up to 150 m relief. Hydrothermal vents colonized with biological communities are located near the caldera fault or along the rift zones. Following the discovery of hydrothermal venting north of the caldera in 1983, a concentrated mapping and sampling effort was made in the mid-late 1980s. An eruption was detected seismically in January 1998; later mapping revealed a lava flow erupted from a 9-km-long fissure at the southern end of Axial caldera. The new lava flows were seen to partially bury a seismometer/ pressure gauge and mooring line deployed in 1997.
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Smithsonian / GVP volcano information


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Wed, 9 Sep 2015, 11:05

Axial Seamount (E Pacific, 480 km west of Oregon): submarine eruption confirmed

An eruption at Axial Seamount, inferred to have started at 2230 on 23 April with an earthquake swarm, was confirmed during 14-29 August by bathymetric data and observations made during a ROV Jason dive. Read all
Wed, 2 Sep 2015, 06:00

Axial Seamount volcano (Juan de Fuca Ridge) - Smithsonian / USGS Weekly Volcanic Activity Report for 2 September-8 September 2015 (New Activity / Unrest)

An eruption at Axial Seamount, inferred to have started at 2230 on 23 April with an earthquake swarm, was confirmed during 14-29 August by bathymetric data and observations made during a ROV Jason dive. Two large lava flows from the N rift zone (8-16 km N of the summit caldera) were at most 127 m thick; some of the thicker areas had drained collapse features indicating they had molten interiors when emplaced. The ROV traversed the flows for about 2 km. ... Read all
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