M4.3 earthquake 155 km ESE of ‘Ohonua, Tonga
A magnitude 4.3 earthquake struck 155 km ESE of ‘Ohonua, Tonga on Sat, Sep 4, 2021, 3:13 AM GMT+13 (14:13 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.9 Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 2021-09-03 14:13:36 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 21.747° S, 173.511° 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 11.9 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.14
- Depth from
- Operator assigned
- Station coverage gap
- 117°
- Stations used
- 21
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.9Tonga · 1836 days ago · 10 km deep · 74 km away
- 4.6121 km E of ‘Ohonua, Tonga · 1834 days ago · 10 km deep · 73 km away
- 4.893 km E of ‘Ohonua, Tonga · 1833 days ago · 10 km deep · 66 km away
- 4.6154 km ESE of ‘Ohonua, Tonga · 1817 days ago · 10 km deep · 24 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000f9yz. Read Wed, Sep 30, 2026, 3:27 PM UTC.