M4.9 earthquake 133 km NNE of Neiafu, Tonga
A magnitude 4.9 earthquake struck 133 km NNE of Neiafu, Tonga on Wed, Apr 29, 2020, 3:47 AM GMT-12 (15:47 UTC), 31 km (19 mi) below the surface.
A larger quake followed: M5.3 123 km N of Neiafu, 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, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2020-04-29 15:47:02 UTC
- Depth
- 31.0 km (19.3 mi), shallow
- Epicenter
- 17.484° S, 173.670° 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 |
|---|---|---|---|
| 4.9 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.076 · 55 stations |
| 5.06 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
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 8.6 km horizontally, 4.6 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- From location
- Station coverage gap
- 53°
- Stations used
- 75
Nearby
Within 100 km, magnitude 1.9 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.3123 km N of Neiafu, Tonga · 2329 days ago · 86 km deep · 51 km away · felt by 2
- 4.5112 km NNW of Neiafu, Tonga · 2309 days ago · 149 km deep · 84 km away
- 4.6106 km SSE of Hihifo, Tonga · 2307 days ago · 35 km deep · 89 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us60009es9 (also filed as iscgem618196610). Read Thu, Oct 1, 2026, 9:35 AM UTC.