M4.6 earthquake Samoa Islands region
A magnitude 4.6 earthquake struck in the Samoa Islands region on Mon, Apr 26, 2021, 10:07 AM GMT+13 (21:07 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.7 66 km N of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-04-25 21:07:08 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 14.945° S, 173.231° W
- Region
- Samoa
- 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 |
|---|---|---|---|
| 4.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.114 · 23 stations |
| 5.05 | 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 6.7 km horizontally, 1.7 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- Operator assigned
- Station coverage gap
- 64°
- Stations used
- 34
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.592 km NNE of Hihifo, Tonga · 1981 days ago · 29 km deep · 39 km away
- 4.650 km NNE of Hihifo, Tonga · 1975 days ago · 69 km deep · 77 km away
- 4.679 km ENE of Hihifo, Tonga · 1970 days ago · 10 km deep · 76 km away
- 4.766 km N of Hihifo, Tonga · 1969 days ago · 22 km deep · 74 km away
- 4.6126 km NNE of Hihifo, Tonga · 1962 days ago · 10 km deep · 10 km away
- 4.3127 km NNE of Hihifo, Tonga · 1956 days ago · 10 km deep · 31 km away
- 4.5136 km NNE of Hihifo, Tonga · 1945 days ago · 10 km deep · 35 km away
- 4.5111 km ENE of Hihifo, Tonga · 1945 days ago · 10 km deep · 64 km away
Before
Earthquakes todaySamoa earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000e4rd (also filed as iscgem620342430). Read Thu, Oct 1, 2026, 3:24 AM UTC.