M4.5 earthquake 158 km E of Neiafu, Tonga
A magnitude 4.5 earthquake struck 158 km E of Neiafu, Tonga on Mon, Oct 18, 2021, 11:20 PM GMT+13 (10:20 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.6 161 km E 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
- 2021-10-18 10:20:52 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 18.722° S, 172.481° 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 5.9 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- Operator assigned
- Station coverage gap
- 76°
- Stations used
- 21
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 1 in the 30 days before it.
After
- 4.6161 km E of Neiafu, Tonga · 1807 days ago · 10 km deep · 20 km away
- 4.2130 km E of Neiafu, Tonga · 1807 days ago · 10 km deep · 35 km away
- 4.6127 km E of Neiafu, Tonga · 1794 days ago · 10 km deep · 36 km away
- 4.5204 km ENE of Neiafu, Tonga · 1773 days ago · 10 km deep · 80 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000fwqd. Read Wed, Sep 30, 2026, 9:38 AM UTC.