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Amsterdam Island, location of Boomeerang Seamount and today's earthquake
Tuesday, Nov 13, 2012
A shallow magnitude 4.8 earthquake occurred today under or near Boomerang Island, about 35 km NE from Amsterdam island (French territory) in the southern Indian Ocean. ... [more]
 

Boomerang Seamount volcano

Submarine volcano -650 m / - 2,133 ft
France, Southern Indian Ocean, -37.72°S / 77.83°E
Current status: normal or dormant (1 out of 5) | Reports
Boomerang Seamount volcano books
Last update: 13 Nov 2012
Typical eruption style: unspecified
Boomerang Seamount volcano eruptions: 1995  No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

An active submarine volcano 18 km NE of Amsterdam Island was first discovered during a bathymetric survey in 1996. The volcano, named Boomerang Seamount, rises to within 650 m of the sea surface and has a 2-km-wide summit caldera that is 200 m deep. Rift zones extend SE and north of the basaltic volcano, giving it an arcuate shape. Boomerang Seamount lies along the axis of the Southeast Indian Ridge and marks the site of the Amsterdam-St. Paul hotspot. This hotspot may have been the source of the Ninetyeast Ridge submarine volcanoes on the Australian Plate prior to its "capture" by the Southeast Indian Ridge, after which volcanism was restricted to the Antarctic Plate. Very short half-life radionuclide dating of fresh volcanic glass samples recovered during the 1996 expedition indicated that Boomerang Seamount had erupted only about 5 months earlier (Johnson et al., 2000). Water column temperature anomalies above the seamount suggest the presence of hydrothermal activity within the caldera.
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Smithsonian / GVP volcano information


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