M4.5 earthquake Samoa Islands region
A magnitude 4.5 earthquake struck in the Samoa Islands region on Tue, Jul 20, 2021, 5:58 AM GMT+13 (16:58 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.7 124 km E 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
- 4.5 (mb), light
- Local time
- UTC
- 2021-07-19 16:58:29 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 15.199° S, 172.089° W
- Region
- Samoa
- 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.
- Location uncertainty
- About 10.9 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- Operator assigned
- Station coverage gap
- 144°
- Stations used
- 31
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todaySamoa earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000eyc2. Read Wed, Sep 30, 2026, 9:38 AM UTC.