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Very strong mag. 6.3 earthquake - South Pacific Ocean on Tuesday, Dec 20, 2022 at 4:38 am (GMT -12) -

Very strong mag. 6.3 earthquake - South Pacific Ocean on Tuesday, Dec 20, 2022 at 4:38 am (GMT -12) Very strong mag. 6.3 earthquake - South Pacific Ocean on Tuesday, Dec 20, 2022 at 4:38 am (GMT -12)

Very strong magnitude 6.3 earthquake at 33 km depth

20 Dec 16:42 UTC: First to report: GEONET (NZ) after 3 minutes.
20 Dec 16:43: Magnitude recalculated from 6.1 to 6.0. Hypocenter depth recalculated from 157.8 to 300.0 km (from 98 to 186 mi). Epicenter location corrected by 87 km (54 mi) towards SSW.
... [show all] ...
20 Dec 17:16: Epicenter location corrected by 4 km (2.5 mi) towards ESE.

Earthquake details

Date & timeDec 20, 2022 16:38:40 UTC -
Local time at epicenterTuesday, Dec 20, 2022 at 4:38 am (GMT -12)
StatusConfirmed
Magnitude6.3
Depth33.0 km
Epicenter latitude / longitude34.05999°S / 178.96204°W
Antipode34.06°N / 1.038°E
Shaking intensityStrong shaking near epicenter
Felt1 report
Primary data sourceGEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
Nearest volcanoBrothers (202 km / 126 mi)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds 20.4°C (69 F), humidity: 90%, wind: 8 m/s (15 kts) from NNE
Estimated seismic energy released1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 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
6.333 kmNew ZealandGEONET (NZ)
5.540 kmSouth of Kermadec IslandsGFZ
5.430 kmSOUTH OF KERMADEC ISLANDSEMSC
5.445 kmSouth of Kermadec IslandsRaspberryShake
5.1157 kmNear ManukauRENASS
5.445 kmNew Zealand: South of the Kermadec IslandsUSGS
5.534 kmNew Zealand: South of Kermadec IslandsGeoAu

Seismograms

Seismic station: Tucson, Arizona (TUC/IU network) | Distance from quake: 10256 km / 6373 mi | Show on map | Station Info
Seismic station Tucson, Arizona: 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. Bandpass filter applied: 0.02-2.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (3)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Translate
South Pacific Ocean (170.7 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 20-30 s : Heard it as a deep long rumble - totally different from thunder or se quakes - like deep but hollow sound like a tank driving under the 100m cliffs nearby | 4 users found this interesting.  
Melbourne suburban / not felt
Arapuni / not felt : Not felt  

Aftershocks

[More info]

Recorded aftershocks, latest first (11 quakes)

Date and timeMag
Depth
LocationDetails
Mar 28, 2023 19:03
1 day 19 hours ago
5.2

33 km
South Pacific Ocean, New ZealandMore
Feb 27, 2023 11:38
4 weeks ago
4.3

100 km
South Pacific Ocean, Gisborne, New ZealandMore
Feb 22, 2023 16:52
5 weeks ago
4.1

33 km
South Pacific Ocean, New ZealandMore
Feb 21, 2023 02:22
5 weeks ago
4.1

207 km
South Pacific Ocean, New ZealandMore
Feb 20, 2023 12:34
5 weeks ago
4.4

33 km
South Pacific Ocean, Gisborne, New ZealandMore
Feb 12, 2023 06:06
7 weeks ago
4.3

186 km
South Pacific Ocean, Gisborne, New ZealandMore
Feb 7, 2023 15:14
7 weeks ago
4.0

100 km
South Pacific Ocean, New ZealandMore
Jan 6, 2023 09:19
12 weeks ago
4.3

339 km
South Pacific Ocean, New ZealandMore
Jan 1, 2023 12:49
13 weeks ago
3.6

100 km
South Pacific Ocean, New ZealandMore
Dec 26, 2022 08:41
13 weeks ago
4.0

409 km
South Pacific OceanMore
Dec 22, 2022 19:00
14 weeks ago
4.0

248 km
South Pacific Ocean, New ZealandMore

Earlier earthquakes in the same area

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