M4.6 earthquake 81 km E of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 81 km E of ‘Ohonua, Tonga on Fri, Jul 21, 2017, 1:46 PM GMT+13 (00:46 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.9 Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-07-21 00:46:42 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 21.218° S, 174.179° 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 9.1 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- Operator assigned
- Station coverage gap
- 74°
- Stations used
- 85
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 1 in the 60 days after this one and 6 in the 30 days before it.
After
Before
- 4.9101 km ENE of ‘Ohonua, Tonga · 3365 days ago · 10 km deep · 43 km away
- 5.176 km ENE of Kolonga, Tonga · 3378 days ago · 35 km deep · 43 km away
- 5.0123 km E of ‘Ohonua, Tonga · 3383 days ago · 10 km deep · 52 km away
- 4.9129 km E of ‘Ohonua, Tonga · 3384 days ago · 10 km deep · 49 km away
- 4.279 km SE of Pangai, Tonga · 3386 days ago · 35 km deep · 95 km away
- 4.6112 km SE of Pangai, Tonga · 3386 days ago · 10 km deep · 91 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000a1br. Read Mon, Oct 5, 2026, 6:36 AM UTC.