M4.0 earthquake 249 km WNW of Neiafu, Tonga
A magnitude 4.0 earthquake struck 249 km WNW of Neiafu, Tonga on Wed, Mar 31, 2021, 6:33 AM GMT+13 (17:33 UTC), 601 km (373 mi) below the surface.
A larger quake followed: M4.3 240 km WNW of Neiafu, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb), light
- Local time
- UTC
- 2021-03-30 17:33:56 UTC
- Depth
- 600.7 km (373.2 mi), deep
- Epicenter
- 17.893° S, 176.209° 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 26.4 km horizontally, 24.1 km in depth
- Magnitude uncertainty
- ±0.17
- Depth from
- From location
- Station coverage gap
- 206°, poorly surrounded by stations
- Stations used
- 13
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.3240 km WNW of Neiafu, Tonga · 1981 days ago · 605 km deep · 12 km away
- 4.2Fiji region · 1957 days ago · 372 km deep · 70 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000dzrw. Read Tue, Sep 29, 2026, 1:00 AM UTC.