M4.0 earthquake 115 km E of Arica, Chile
A magnitude 4.0 earthquake struck 115 km E of Arica, Chile on Tue, Sep 21, 2021, 10:08 PM GMT-3 (01:08 UTC), 138 km (86 mi) below the surface.
A larger quake followed: M4.6 75 km ESE of Palca, Peru. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-09-22 01:08:57 UTC
- Depth
- 138.1 km (85.8 mi), intermediate-depth
- Epicenter
- 18.608° S, 69.214° W
- Region
- Chile
- Felt reports
- 1
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 5.8 km horizontally, 5.7 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- From location
- Station coverage gap
- 65°
- Stations used
- 28
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.675 km ESE of Palca, Peru · 1807 days ago · 3 km deep · 77 km away
- 4.4101 km SSE of Arica, Chile · 1793 days ago · 89 km deep · 93 km away · felt by 2
- 4.172 km SE of Palca, Peru · 1792 days ago · 131 km deep · 49 km away
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fdal. Read Sat, Oct 3, 2026, 8:12 AM UTC.