M4.0 earthquake 56 km SW of Pangai, Tonga
A magnitude 4.0 earthquake struck 56 km SW of Pangai, Tonga on Wed, Jul 25, 1979, 3:51 AM GMT+13 (14:51 UTC), 173 km (107 mi) below the surface.
A larger quake followed: M5.3 49 km SE of Pangai, 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), light
- Local time
- UTC
- 1979-07-24 14:51:14 UTC
- Depth
- 173.0 km (107.5 mi), intermediate-depth
- Epicenter
- 20.196° S, 174.718° 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.
- Stations used
- 8
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.074 km SE of Pangai, Tonga · 17226 days ago · 33 km deep · 94 km away
- 5.349 km SE of Pangai, Tonga · 17209 days ago · 76 km deep · 72 km away
- 4.922 km NE of Pangai, Tonga · 17186 days ago · 33 km deep · 79 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000121f. Read Tue, Sep 29, 2026, 10:34 PM UTC.