A 6.05 magnitude earthquake struck the South Sandwich Islands region, the GFZ reported. That is the complete picture from the agency's initial disclosure. What the reading leaves open is depth and whatever downstream risk the location may carry.
The counterargument to treating 6.05 as the whole story: opening magnitude figures from monitoring bodies are routinely revised as more data arrives. The first number tells you where the needle landed. What moved it, and how far the effects reach, is a later question.
On balance, the GFZ's 6.05 is the confirmed datum. The line to watch is whether a follow-on report revises the magnitude or adds any detail on impact.