M4.5 earthquake 146 km WNW of Neiafu, Tonga
A magnitude 4.5 earthquake struck 146 km WNW of Neiafu, Tonga on Thu, Aug 19, 2021, 4:42 PM GMT+13 (03:42 UTC), 235 km (146 mi) below the surface.
A larger quake followed: M4.6 138 km W 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
- 4.5 (mb), light
- Local time
- UTC
- 2021-08-19 03:42:36 UTC
- Depth
- 234.8 km (145.9 mi), intermediate-depth
- Epicenter
- 18.373° S, 175.344° 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 10.4 km horizontally, 7.9 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 114°
- Stations used
- 28
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 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000f5r7. Read Wed, Sep 30, 2026, 2:44 AM UTC.