At 18:32 UTC (16:32 local time and 20:32 Italian time) yesterday, August 12, 2021, a magnitude Mwpd 8.1 earthquake was recorded in the South Atlantic Ocean at sea (Lat. -57.157, Lon. -24.596) offshore the South Sandwich Islands at about 20 km depth.
The recorded earthquake is part of a complex seismic sequence. Seismogram analysis indicates a stronger earthquake occurred about three minutes after the M7.5 initial shock followed by an intense and prolonged aftershock sequence.
Such earthquakes require in-depth seismologist analysis and detailed modeling that may take several days.
The King Edward Point mareograph (external link) registered sea level changes of about 80cm.
*Flanders Marine Institute (VLIZ); Intergovernmental Oceanographic Commission (IOC) (2021): Sea level station monitoring facility. Accessed at http://www.ioc-sealevelmonitoring.org on 2021-08-13 at VLIZ. DOI: 10.14284/482