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Very strong mag. 6.0 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 16, 2021 at 7:14 pm (GMT -2) -

Very strong mag. 6.0 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 16, 2021 at 7:14 pm (GMT -2) Very strong mag. 6.0 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 16, 2021 at 7:14 pm (GMT -2)

Very strong magnitude 6.0 earthquake at 15 km depth

16 Dec 21:23 UTC: First to report: GFZ after 9 minutes.
16 Dec 21:24: Magnitude recalculated from 6.0 to 5.9. Epicenter location corrected by 5 km (3.1 mi) towards NNW.
16 Dec 21:34: Now using data updates from USGS
16 Dec 23:10: Magnitude recalculated from 6.1 to 6.0. Hypocenter depth recalculated from 10.0 to 15.0 km (from 6.2 to 9.3 mi). Epicenter location corrected by 6.1 km (3.8 mi) towards NNE.

Earthquake details

Date & timeDec 16, 2021 21:14:46 UTC -
Local time at epicenterThursday, Dec 16, 2021 at 7:14 pm (GMT -2)
StatusConfirmed
Magnitude6
Depth15.0 km
Epicenter latitude / longitude60.1797°S / 23.8016°W (South Atlantic Ocean, South Georgia & South Sandwich Islands)
Antipode60.18°N / 156.198°E
Shaking intensityStrong shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoBristol Island (202 km / 126 mi)
Nearby towns and cities
Weather at epicenter at time of quakeLight Snow -0.4°C (31 F), humidity: 98%, wind: 13 m/s (26 kts) from N
Estimated seismic energy released6.3 x 1013 joules (17.5 gigawatt hours, equivalent to 15080 tons of TNT or 0.9 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
6.015 kmSouth Sandwich Islands RegionUSGS
6.015 kmSouth Sandwich Islands RegionRaspberryShake
6.12 kmSOUTH SANDWICH ISLANDS REGIONEMSC
5.610 kmNear Mar Del PlataRENASS
6.110 kmSouth Sandwich Islands RegionGFZ
6.079 kmSouth Georgia & the South Sandwich Is. [Sea]INGV
6.153 kmSouth Sandwich Islands RegionGeoAu

Seismograms

Seismic station: Palmer Station, Antarctica (PMSA/IU network) | Distance from quake: 2091 km / 1299 mi | Show on map | Station Info
Seismic station Palmer Station, Antarctica: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Aftershocks

[More info]

Recorded aftershocks, latest first (1 quake)

Date and timeMag
Depth
LocationDetails
Apr 27, 2022 09:27
32 weeks ago
5.4

10 km
South Atlantic Ocean, South Georgia & South Sandwich IslandsMore

Earlier earthquakes in the same area

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