M4.2 earthquake 80 km S of ‘Ohonua, Tonga
A magnitude 4.2 earthquake struck 80 km S of ‘Ohonua, Tonga on Sun, Sep 19, 2021, 7:03 PM GMT+13 (06:03 UTC), 35 km (22 mi) below the surface.
A larger quake followed: M5.0 169 km S 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
- 4.2 (mb), light
- Local time
- UTC
- 2021-09-19 06:03:33 UTC
- Depth
- 35.0 km (21.7 mi), shallow
- Epicenter
- 22.058° S, 175.021° 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 14.2 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.14
- Depth from
- Operator assigned
- Station coverage gap
- 210°, poorly surrounded by stations
- Stations used
- 18
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.3146 km SSE of ‘Ohonua, Tonga · 1826 days ago · 10 km deep · 82 km away
- 4.5139 km SSE of ‘Ohonua, Tonga · 1802 days ago · 10 km deep · 70 km away
- 5.0169 km S of ‘Ohonua, Tonga · 1799 days ago · 10 km deep · 90 km away
- 4.5137 km SSE of ‘Ohonua, Tonga · 1796 days ago · 10 km deep · 78 km away
- 4.7148 km S of ‘Ohonua, Tonga · 1795 days ago · 10 km deep · 72 km away
- 4.8Tonga region · 1795 days ago · 10 km deep · 70 km away
- 4.2148 km SSE of ‘Ohonua, Tonga · 1788 days ago · 10 km deep · 78 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fdua. Read Wed, Sep 30, 2026, 11:47 PM UTC.