M4.4 earthquake 172 km WNW of Hihifo, Tonga
A magnitude 4.4 earthquake struck 172 km WNW of Hihifo, Tonga on Thu, May 20, 2021, 7:35 AM GMT-12 (19:35 UTC), 369 km (229 mi) below the surface.
A larger quake followed: M4.6 123 km NW 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
- 4.4 (mb), light
- Local time
- UTC
- 2021-05-20 19:35:03 UTC
- Depth
- 368.9 km (229.2 mi), deep
- Epicenter
- 15.352° S, 175.279° 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 15.9 km horizontally, 9.1 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- From location
- Station coverage gap
- 113°
- Stations used
- 19
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.5210 km S of Mata-Utu, Wallis and Futuna · 1958 days ago · 10 km deep · 93 km away
- 4.4101 km WNW of Hihifo, Tonga · 1938 days ago · 255 km deep · 73 km away
- 4.4114 km W of Hihifo, Tonga · 1930 days ago · 323 km deep · 92 km away
- 4.3126 km WNW of Hihifo, Tonga · 1918 days ago · 249 km deep · 48 km away
- 4.6123 km NW of Hihifo, Tonga · 1913 days ago · 10 km deep · 97 km away
- 4.6198 km WNW of Hihifo, Tonga · 1905 days ago · 10 km deep · 29 km away
- 4.3150 km W of Hihifo, Tonga · 1904 days ago · 128 km deep · 77 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000eeug. Read Wed, Sep 30, 2026, 4:02 AM UTC.