M4.6 earthquake 140 km NE of Neiafu, Tonga
A magnitude 4.6 earthquake struck 140 km NE of Neiafu, Tonga on Thu, Apr 22, 2021, 4:39 AM GMT-12 (16:39 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.1 96 km ENE 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
- 4.6 (mb), light
- Local time
- UTC
- 2021-04-22 16:39:37 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 17.950° S, 172.880° 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 5.3 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- Operator assigned
- Station coverage gap
- 164°
- Stations used
- 30
Nearby
Within 100 km, magnitude 1.6 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.196 km ENE of Neiafu, Tonga · 1976 days ago · 10 km deep · 45 km away
- 4.5113 km NE of Neiafu, Tonga · 1971 days ago · 10 km deep · 50 km away
- 5.1103 km NNE of Neiafu, Tonga · 1969 days ago · 10 km deep · 94 km away · felt by 1
- 4.6161 km ENE of Neiafu, Tonga · 1957 days ago · 10 km deep · 57 km away
- 4.5221 km SE of Hihifo, Tonga · 1956 days ago · 10 km deep · 100 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000dy9p. Read Tue, Sep 29, 2026, 10:07 PM UTC.