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Strong mag. 5.7 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 30, 2021 at 2:58 am (GMT -2) -

Strong mag. 5.7 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 30, 2021 at 2:58 am (GMT -2) Strong mag. 5.7 earthquake - South Atlantic Ocean, South Georgia & South Sandwich Islands, on Thursday, Dec 30, 2021 at 2:58 am (GMT -2)

Strong magnitude 5.7 earthquake at 37 km depth

30 Dec 05:07 UTC: First to report: GFZ after 9 minutes.
30 Dec 05:08: Magnitude recalculated from 5.9 to 6.0. Epicenter location corrected by 1.3 km (0.8 mi) towards SSE.
30 Dec 05:15: Now using data updates from USGS
30 Dec 06:16: Magnitude recalculated from 5.8 to 5.7. Hypocenter depth recalculated from 33.4 to 36.6 km (from 21 to 23 mi). Epicenter location corrected by 3.2 km (2 mi) towards WNW.

Earthquake details

Date & timeDec 30, 2021 04:58:15 UTC -
Local time at epicenterThursday, Dec 30, 2021 at 2:58 am (GMT -2)
Depth36.6 km
Epicenter latitude / longitude55.8891°S / 28.1373°W (South Atlantic Ocean, South Georgia & South Sandwich Islands)
Antipode55.889°N / 151.863°E
Shaking intensityModerate shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoProtector Seamounts (5 km / 3 mi)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds 0.4°C (33 F), humidity: 80%, wind: 18 m/s (35 kts) from WSW
Estimated seismic energy released2.2 x 1013 joules (6.22 gigawatt hours, equivalent to 5351 tons of TNT or 0.3 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.
5.737 kmSouth Sandwich Islands RegionUSGS
5.737 kmSouth Sandwich Islands RegionRaspberryShake
5.610 kmNear Mar Del PlataRENASS
5.740 kmSouth Sandwich Islands RegionGFZ
5.859 kmSouth Sandwich Islands RegionGeoAu

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.


[More info]

Recorded aftershocks, latest first (1 quake)

Date and timeMag
Feb 13, 2022 06:54
42 weeks ago

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

Earlier earthquakes in the same area

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