M4.6 earthquake 161 km ENE of Neiafu, Tonga
A magnitude 4.6 earthquake struck 161 km ENE of Neiafu, Tonga on Fri, May 21, 2021, 5:27 AM GMT-11 (16:27 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.4 152 km NE 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
- 2021-05-21 16:27:57 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 18.314° S, 172.494° 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 12.5 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- Operator assigned
- Station coverage gap
- 104°
- Stations used
- 19
Nearby
Within 100 km, magnitude 1.6 and up: 1 in the 60 days after this one and 2 in the 30 days before it.
After
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000ef33. Read Wed, Sep 30, 2026, 9:41 AM UTC.