M4.9 earthquake 215 km S of ‘Ohonua, Tonga
A magnitude 4.9 earthquake struck 215 km S of ‘Ohonua, Tonga on Tue, Aug 9, 1977, 6:14 AM GMT+13 (17:14 UTC), 34 km (21 mi) below the surface.
A larger quake followed: M5.3 224 km SSW 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
- 4.9 (mb), light
- Local time
- UTC
- 1977-08-08 17:14:27 UTC
- Depth
- 34.0 km (21.1 mi), shallow
- Epicenter
- 23.278° S, 174.943° 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
- 29
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 3 in the 60 days after this one and 5 in the 30 days before it.
After
- 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 45 km away
- 4.3169 km SSW of ‘Ohonua, Tonga · 17906 days ago · 33 km deep · 66 km away
- 5.5241 km S of ‘Ohonua, Tonga · 17898 days ago · 15 km deep · 38 km away
Before
- 5.0186 km S of ‘Ohonua, Tonga · 17943 days ago · 33 km deep · 30 km away
- 4.5161 km SSW of ‘Ohonua, Tonga · 17950 days ago · 123 km deep · 78 km away
- 4.4269 km S of ‘Ohonua, Tonga · 17968 days ago · 33 km deep · 61 km away
- 5.0214 km S of ‘Ohonua, Tonga · 17968 days ago · 63 km deep · 37 km away
- 5.1215 km SSW of ‘Ohonua, Tonga · 17970 days ago · 42 km deep · 70 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000q13. Read Tue, Sep 22, 2026, 5:20 AM UTC.