M5.2 earthquake 156 km WSW of Hihifo, Tonga
A magnitude 5.2 earthquake struck 156 km WSW of Hihifo, Tonga on Mon, Jan 31, 1977, 8:37 AM GMT-12 (20:37 UTC), 49 km (30 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.2 (Ms, surface-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-01-31 20:37:20 UTC
- Depth
- 49.0 km (30.4 mi), shallow
- Epicenter
- 16.482° S, 175.155° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.2 | Ms, surface-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.75 | Mw, moment | ISC-GEM global catalog | Final · ±0.22 |
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
- 37
Nearby
Within 100 km, magnitude 2.2 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000me7 (also filed as iscgem704184). Read Mon, Oct 5, 2026, 5:31 AM UTC.