The M 7.1 earthquake in the southern Indian Ocean on December 4, 2015, occurred as the result of oblique-normal faulting within the oceanic crust of the Antarctica plate, nearly 700 km to the south of the Australia: Antarctica plate boundary in this region, which is defined by the Southeast Indian Ridge. Focal mechanisms indicate faulting occurred on an oblique-normal faulting structure moderately dipping towards either the west, or the southeast.Within 750 km, seismicity is predominantly focused on the ridge, with some off-ridge earthquakes on the southward extensions of the Vlamingh and Geelvinck Fracture Zones to the northwest of the December 4, 2015 event.
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