Mag 6.0 and 5.4 Earthquakes, South Sandwich Islands, S. Atlantic

[Astronuc]

I thought the 6.0 Mag was a one off, but then a 5.4 Mag happened.

M 6.0 - South Sandwich Islands region
https://earthquake.usgs.gov/earthquakes/eventpage/us7000dj9v/executive

• 2021-03-14 12:05:13 (UTC)
• 59.841°S 29.499°W
• 10.0 km depth

M 5.4 - South Sandwich Islands region
https://earthquake.usgs.gov/earthquakes/eventpage/us7000djam/executive

• 2021-03-14 13:35:32 (UTC)
• 59.530°S 29.746°W
• 10.0 km depth

This is a normally quiet area.

 

[fresh_42]

I have found this file for the main event (there has been 2 aftershocks M4.7 and M5.5):
https://geofon.gfz-potsdam.de/data/alerts/2021/gfz2021fcmd/mt.txt

Does anybody know how to read the tensor data?