M4.9 earthquake Tonga
A magnitude 4.9 earthquake struck in Tonga on Tue, Sep 21, 2021, 1:25 PM GMT+13 (00:25 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
- 4.9 (mb), light
- Local time
- UTC
- 2021-09-21 00:25:39 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 21.114° S, 173.279° 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 10.6 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.20
- Depth from
- Operator assigned
- Station coverage gap
- 105°
- Stations used
- 15
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.8121 km ENE of ‘Ohonua, Tonga · 1835 days ago · 10 km deep · 71 km away
- 4.6121 km E of ‘Ohonua, Tonga · 1834 days ago · 10 km deep · 54 km away
- 4.893 km E of ‘Ohonua, Tonga · 1833 days ago · 10 km deep · 89 km away
- 4.6154 km ESE of ‘Ohonua, Tonga · 1817 days ago · 10 km deep · 98 km away
- 5.395 km E of ‘Ohonua, Tonga · 1789 days ago · 10 km deep · 80 km away · felt by 3
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fe43. Read Wed, Sep 30, 2026, 3:26 PM UTC.