The Southeast Indian Ridge (denoted by the yellow line)
The Southeast Indian Ridge (SEIR) is a mid-ocean ridge in the southern Indian Ocean. A divergent tectonic plate boundary stretching almost 6,000 km (3,700 mi) between the Rodrigues Triple Junction (25°S70°E / 25°S 70°E / -25; 70) in the Indian Ocean and the Macquarie Triple Junction (63°S165°E / 63°S 165°E / -63; 165) in the Pacific Ocean, the SEIR forms the plate boundary between the Australian and Antarctic plates since the Oligocene (anomaly 13).[1]
The SEIR is the spreading centre closest to the Kerguelen and Amsterdam–Saint-Paul hotspots.[2] The SEIR has an intermediate full spreading rate of 65 mm/a (2.6 in/year), and, because Antarctica is virtually stationary, this results in a northward ridge migration of half that rate.[3] Spreading rates along the SEIR varies from 69 mm/a (2.7 in/year) near 88°E to 75 mm/a (3.0 in/year) near 120°E.[4]
Approximate surface projections that illustrate Amsterdam Saint Paul hotspot with the mantle Bouguer abnormality mapped in red shading to indicate the likely current plume location.[5] Also shown is the approximate outline of the Amsterdam Saint Paul Plateau (brown), the Boomerang Seamount (blue), nearby subsurface transform faults (grey), fracture zones (orange), their probable extensions (light orange) and plate boundary (white) as referred to in text of article.[6]. Clicking on the map to enlarge it enables mouse over of feature names.
^Cochran & Sempéré 1997, The Southeast Indian Ridge, pp. 15467, 15469
^Graham et al. 1999, Introduction, p. 298
^Scheirer et al. 2000, Background, pp. 8244, 8247
^Sempéré & Cochran 1997, General Characteristics of the Southeast Indian Ridge, p. 15490
^Kumar et al. 2023, Fig. 5b.
^Dubinina et al. 2017, Fig. 4.
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(SWIR, between the African and Antarctic plates) 16 mm/yr; and the SoutheastIndianRidge (SEIR, between the Indo-Australian and Antarctic plates) 60 mm/yr...
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