M4.8 earthquake 78 km ESE of ‘Ohonua, Tonga
A magnitude 4.8 earthquake struck 78 km ESE of ‘Ohonua, Tonga on Fri, May 21, 2021, 10:03 AM GMT+13 (21:03 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.9 131 km ENE 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
- 4.8 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-05-20 21:03:31 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 21.486° S, 174.208° 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 15.7 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- Operator assigned
- Station coverage gap
- 148°
- Stations used
- 23
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 3 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.9131 km ENE of ‘Ohonua, Tonga · 1947 days ago · 10 km deep · 69 km away
- 4.4148 km SE of ‘Ohonua, Tonga · 1923 days ago · 10 km deep · 89 km away
- 4.6104 km ESE of ‘Ohonua, Tonga · 1913 days ago · 10 km deep · 43 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000e4w5. Read Sat, Oct 3, 2026, 1:15 AM UTC.