M4.1 earthquake 21 km SW of Tacna, Peru
A magnitude 4.1 earthquake struck 21 km SW of Tacna, Peru on Mon, Aug 22, 1983, 3:50 AM GMT-5 (08:50 UTC), 90 km (56 mi) below the surface.
A larger quake followed: M4.9 50 km SE 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
- 4.1 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1983-08-22 08:50:00 UTC
- Depth
- 90.3 km (56.1 mi), intermediate-depth
- Epicenter
- 18.171° S, 70.367° W
- Region
- Peru
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Felt at Tacna, Peru.
From the USGS event page for usp0001xuy. U.S. Geological Survey text and figures are in the public domain.
Did you feel it?
No one has reported feeling this quake to the USGS.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayPeru earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001xuy. Read Sat, Oct 3, 2026, 8:48 AM UTC.