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Strong mag. 5.8 earthquake - South Pacific Ocean, 228 km northwest of Nukalofa, Nuku'alofa, Tongatapu, on Thursday, Sep 9, 2021 at 5:59 pm (GMT +13) -

This quake was likely an aftershock of the 6.0 quake South Pacific Ocean, 215 km northwest of Nukalofa, Nuku'alofa, Tongatapu, Sep 7, 2021 10:49 pm (GMT +13), which had occurred 1 day 19 hours earlier.
Strong mag. 5.8 earthquake - South Pacific Ocean, 228 km northwest of Nukalofa, Nuku\'alofa, Tongatapu, on Thursday, Sep 9, 2021 at 5:59 pm (GMT +13) Strong mag. 5.8 earthquake - South Pacific Ocean, 228 km northwest of Nukalofa, Nuku\'alofa, Tongatapu, on Thursday, Sep 9, 2021 at 5:59 pm (GMT +13)

Strong magnitude 5.8 earthquake at 10 km depth

9 Sep 05:12 UTC: First to report: GFZ after 13 minutes.
9 Sep 05:13: Epicenter location corrected by 10.5 km (6.6 mi) towards W.
9 Sep 07:44: Magnitude recalculated from 5.5 to 5.8. Epicenter location corrected by 14 km (8.6 mi) towards W.

Earthquake details

Date & timeSep 9, 2021 04:59:43 UTC -
Local time at epicenterThursday, Sep 9, 2021 at 5:59 pm (GMT +13)
Depth10.0 km
Epicenter latitude / longitude19.4°S / 176.35°W (South Pacific Ocean, Tonga)
Antipode19.4°N / 3.65°E
Shaking intensityVery strong shaking
Felt1 report
Primary data sourceGFZ (German Research Centre for Geosciences)
Nearest volcanoTofua (116 km / 72 mi)
Nearby towns and cities214 km (133 mi) WNW of Bangai (Pangai) (pop: 1,740) | Show on map | Quakes nearby
228 km (141 mi) NNW of Nukalofa (Nuku'alofa) (pop: 22,400) | Show on map | Quakes nearby
228 km (141 mi) NNW of Nuku‘alofa (pop: 22,400) | Show on map | Quakes nearby
235 km (146 mi) NW of Kolonga (pop: 1,100) | Show on map | Quakes nearby
260 km (161 mi) NW of ‘Ohonua (Ohonua) (pop: 1,240) | Show on map | Quakes nearby
262 km (163 mi) WSW of Neiafu (pop: 4,320) | Show on map | Quakes nearby
469 km (292 mi) SW of Hihifo (pop: 815) | Show on map | Quakes nearby
232 km (144 mi) NNW of Amsterdam Island (pop: 75,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds 24.5°C (76 F), humidity: 84%, wind: 7 m/s (14 kts) from SSE
Estimated seismic energy released3.2 x 1013 joules (8.78 gigawatt hours, equivalent to 7558 tons of TNT or 0.5 atomic bombs!) | about seismic energy
Show interactive Map
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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.
5.810 kmTonga: Fiji Islands RegionGFZ
5.210 kmTonga: Near NouméaRENASS
5.825 kmTonga: Fiji Islands RegionGeoAu
5.810 km224 Km WNW of Pangai, TongaUSGS


Seismic station: Monasavu, Fiji (MSVF/II network) | Distance from quake: 618 km / 384 mi | Show on map | Station Info
Seismic station Monasavu, Fiji: 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 (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Arauco / Very strong shaking (MMI VII) / complex rolling (tilting in multiple directions) : Es broma chek  

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