M5.5 earthquake 138 km W of Hihifo, Tonga
A magnitude 5.5 earthquake struck 138 km W of Hihifo, Tonga on Wed, May 19, 1976, 4:59 PM GMT-12 (04:59 UTC), 292 km (181 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1976-05-20 04:59:47 UTC
- Depth
- 292.0 km (181.4 mi), intermediate-depth
- Epicenter
- 15.936° S, 175.093° 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 |
|---|---|---|---|
| 5.5 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.76 | Mw, moment | ISC-GEM global catalog | Final · ±0.46 |
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- CONSTRAINED_BY_DEPTH_PHASES
- Stations used
- 116
Nearby
Within 100 km, magnitude 2.5 and up: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000gef (also filed as iscgem714323). Read Fri, Oct 2, 2026, 8:32 AM UTC.