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Light mag. 4.6 earthquake - South Pacific Ocean, Tonga, on Saturday, Mar 18, 2023 at 9:32 am (GMT +13) -

Light mag. 4.6 earthquake - South Pacific Ocean, Tonga, on Saturday, Mar 18, 2023 at 9:32 am (GMT +13) Light mag. 4.6 earthquake - South Pacific Ocean, Tonga, on Saturday, Mar 18, 2023 at 9:32 am (GMT +13)

Light magnitude 4.6 earthquake at 156 km depth

17 Mar 21:01 UTC: First to report: GFZ after 29 minutes.
17 Mar 21:14: Now using data updates from USGS
... [show all] ...
17 Mar 23:18: Hypocenter depth recalculated from 156.4 to 156.3 km (from 97 to 97 mi).

Earthquake details

Date & timeMar 17, 2023 20:32:04 UTC -
Local time at epicenterSaturday, Mar 18, 2023 at 9:32 am (GMT +13)
Depth156.3 km
Epicenter latitude / longitude23.3535°S / 177.0585°W (South Pacific Ocean, Tonga)
Antipode23.354°N / 2.941°E
Shaking intensityVery weak shaking
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoUnnamed 24.8°S/177.02°W (161 km / 100 mi)
Nearby towns and cities310 km (193 mi) SW of Haveluloto (pop: 3,420) | Show on map | Quakes nearby
312 km (194 mi) SW of Nukalofa (Nuku'alofa) (pop: 22,400) | Show on map | Quakes nearby
312 km (194 mi) SW of Nuku‘alofa (pop: 22,400) | Show on map | Quakes nearby
312 km (194 mi) SW of ‘Ohonua (Ohonua) (pop: 1,240) | Show on map | Quakes nearby
321 km (199 mi) SW of Kolonga (pop: 1,100) | Show on map | Quakes nearby
483 km (300 mi) SW of Bangai (Pangai) (pop: 1,740) | Show on map | Quakes nearby
310 km (192 mi) SW of Amsterdam Island (pop: 75,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeLight Rain 25.9°C (79 F), humidity: 78%, wind: 11 m/s (21 kts) from E
Estimated seismic energy released5 x 1011 joules (139 megawatt hours, equivalent to 120 tons of TNT) | 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.
4.6156 kmTonga: South of the Fiji IslandsUSGS
4.6156 kmTonga: South of Fiji IslandsRaspberryShake
4.5190 kmTonga: South of Fiji IslandsGFZ
4.610 kmTonga: South Of Fiji IslandsIRIS


Seismic station: Folaha (Nukuhetulu) (TNG1/YC network) | Distance from quake: 309 km / 192 mi | Show on map | Station Info
Seismic station Folaha (Nukuhetulu): 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: 0.2-10.0 Hz. 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.

Earlier earthquakes in the same area

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