There have been several deep earthquakes along the RING OF FIRE. The Antarctica area is reacting to seismic pressure.
SS&F
The big one that I saw as on the Atlantic side of the Drake passage, but it probably is close enough to say ring of fire.
I think the suggestion wasthat the Solar Storm (I did not check to see this happened....)struck the earth and this caused electrical currents and heating in the outer mantle resulting in shifts in the crust. (I think.)