M4.8 earthquake 161 km SE of Hihifo, Tonga
A magnitude 4.8 earthquake struck 161 km SE of Hihifo, Tonga on Thu, Oct 21, 2021, 4:37 PM GMT+13 (03:37 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (mb), light
- Local time
- UTC
- 2021-10-21 03:37:20 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 16.901° S, 172.642° W
- Region
- Tonga
- Felt reports
- 1
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 10.5 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- Operator assigned
- Station coverage gap
- 52°
- Stations used
- 33
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.5148 km NE of Neiafu, Tonga · 1801 days ago · 10 km deep · 96 km away
- 4.6106 km ESE of Hihifo, Tonga · 1797 days ago · 10 km deep · 83 km away
- 4.695 km SE of Hihifo, Tonga · 1746 days ago · 10 km deep · 68 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000fwbv. Read Wed, Sep 30, 2026, 6:15 AM UTC.