M4.8 earthquake 121 km ENE of ‘Ohonua, Tonga
A magnitude 4.8 earthquake struck 121 km ENE of ‘Ohonua, Tonga on Wed, Sep 22, 2021, 4:30 AM GMT+13 (15:30 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.3 95 km E of ‘Ohonua, Tonga. This one was a foreshock.
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
- 2021-09-21 15:30:09 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 20.845° S, 173.902° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 5.7 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- Operator assigned
- Station coverage gap
- 78°
- Stations used
- 32
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 7 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.6121 km E of ‘Ohonua, Tonga · 1834 days ago · 10 km deep · 35 km away
- 4.893 km E of ‘Ohonua, Tonga · 1833 days ago · 10 km deep · 70 km away
- 4.433 km SSE of Pangai, Tonga · 1831 days ago · 10 km deep · 90 km away
- 4.761 km SSW of Pangai, Tonga · 1831 days ago · 35 km deep · 84 km away
- 4.586 km SE of Pangai, Tonga · 1811 days ago · 10 km deep · 68 km away
- 5.395 km E of ‘Ohonua, Tonga · 1789 days ago · 10 km deep · 47 km away · felt by 3
- 4.4149 km SE of Pangai, Tonga · 1775 days ago · 10 km deep · 46 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fe4t. Read Wed, Sep 30, 2026, 1:54 PM UTC.