Moderate mag. 5.0 earthquake - South Pacific Ocean, Tonga, on Saturday, Oct 23, 2021 10:59 am (GMT +13) -

Moderate mag. 5.0 earthquake - South Pacific Ocean, Tonga, on Saturday, Oct 23, 2021 10:59 am (GMT +13)

Moderate magnitude 5.0 earthquake at 88 km depth

22 Oct 22:11 UTC: First to report: EMSC after 12 minutes.
22 Oct 22:12: Magnitude recalculated from 4.8 to 4.5. Hypocenter depth recalculated from 204.0 to 176.0 km (from 127 to 109 mi). Epicenter location corrected by 29 km (18 mi) towards SSE.
... [show all] ...
23 Oct 00:26: Hypocenter depth recalculated from 85.0 to 88.0 km (from 53 to 55 mi). Epicenter location corrected by 9.4 km (5.9 mi) towards NW.
Update Fri, 22 Oct 2021, 22:21
Moderate yet deep 5.0 quake hits near Hihifo, Niuas, Tonga
5.0 quake South Pacific Ocean, Tonga, Oct 23, 2021 10:59 am (GMT +13)
5.0 quake South Pacific Ocean, Tonga, Oct 23, 2021 10:59 am (GMT +13)
The European-Mediterranean Seismological Centre (EMSC) reported a magnitude 5.0 quake in Tonga near Hihifo, Niuas, only 21 minutes ago. The earthquake hit in the morning on Saturday, October 23rd, 2021, at 10:59 am local time at an intermediate to considerable depth of 175 km. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Our monitoring service identified a second report from the German Research Centre for Geosciences (GFZ) which listed the quake at magnitude 5.1.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Hihifo (pop. 820) located 78 km from the epicenter.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

Download the Volcanoes & Earthquakes app and get one of the fastest seismic alerts online:
Android | iOS

Earthquake data

Date & time: Oct 22, 2021 21:59:48 UTC -
Local time at epicenter: Saturday, Oct 23, 2021 10:59 am (GMT +13)
Magnitude: 5
Depth: 88.0 km
Epicenter latitude / longitude: 16.85°S / 174.08°W (South Pacific Ocean, Tonga)
Antipode: 16.85°N / 5.92°E
Nearest volcano: Tafahi (123 km / 76 mi)
Nearby towns and cities:
104 km (65 mi) SSW of Hihifo (pop: 815) --> See nearby quakes!
201 km (125 mi) N of Neiafu (pop: 4,320) --> See nearby quakes!
331 km (206 mi) N of Pangai (pop: 1,740) --> See nearby quakes!
401 km (249 mi) SSW of Mulifanua (Samoa) (pop: 4,510) --> See nearby quakes!
401 km (249 mi) SSW of Asau (Samoa) (pop: 6,640) --> See nearby quakes!
408 km (254 mi) SSW of Fasito‘outa (Samoa) (pop: 2,100) --> See nearby quakes!
417 km (259 mi) SW of Apia (Samoa) (pop: 40,400) --> See nearby quakes!
456 km (283 mi) SW of Tāfuna (Tualauta, American Samoa) (pop: 11,000) --> See nearby quakes!
456 km (283 mi) SSE of Mata-Utu (Hahake, Wallis & Futuna) (pop: 1,200) --> See nearby quakes!
461 km (287 mi) SW of Pago Pago (Ma'Oputasi, American Samoa) (pop: 11,500) --> See nearby quakes!
Weather at epicenter at time of quake:
Broken Clouds 25.7°C (78 F), humidity: 61%, wind: 8 m/s (16 kts) from SE
Primary data source: EMSC (European-Mediterranean Seismological Centre)
Estimated released energy: 2 x 1012 joules (554 megawatt hours, equivalent to 477 tons of TNT) | about seismic energy
Show interactive Map
[smaller] [bigger]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
If you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable to earthquake science, seismic hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

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.
4.9132 kmTonga IslandsGFZ
5.186 kmTonga IslandsGeoAu
5.074 km128 Km S of Hihifo, TongaUSGS

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.
Volcanoes & Earthquakes - new app for Android


[More info]

Recorded aftershocks, latest first (0 quake)

So far, no aftershocks have been registered.

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version
Why is there advertising on this site?
Support us - Help us upgrade our services!
We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Earthquake archive from 1900 onwards
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Most texts and images, in particular photographs, on this website are protected by copyright. Further reproduction and use of without authorization is usually not consented. If you are not sure or need licensing rights for photographs, for example for publications and commercial use, please contact us.