M4.0 earthquake 124 km W of Hihifo, Tonga
A magnitude 4.0 earthquake struck 124 km W of Hihifo, Tonga on Mon, Oct 18, 2021, 12:16 PM GMT-12 (00:16 UTC), 258 km (160 mi) below the surface.
A larger quake followed: M4.6 126 km WSW of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-10-19 00:16:22 UTC
- Depth
- 257.6 km (160.1 mi), intermediate-depth
- Epicenter
- 15.810° S, 174.953° 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 15.3 km horizontally, 9.0 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 132°
- Stations used
- 24
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.3198 km WNW of Hihifo, Tonga · 1782 days ago · 10 km deep · 77 km away
- 4.2123 km WSW of Hihifo, Tonga · 1775 days ago · 204 km deep · 73 km away
- 4.298 km NW of Hihifo, Tonga · 1759 days ago · 214 km deep · 89 km away
- 4.6126 km WSW of Hihifo, Tonga · 1749 days ago · 284 km deep · 51 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000fvrv. Read Thu, Oct 1, 2026, 4:43 PM UTC.