Chile earthquakes

M3.4 earthquake 56 km WSW of San Antonio, Chile

A magnitude 3.4 earthquake struck 56 km WSW of San Antonio, Chile on Sat, Oct 12, 1985, 4:11 AM GMT-4 (08:11 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.3 52 km WSW of San Antonio, Chile. This one was a foreshock.

San Antonio forecastMore in Chile

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.4 (mb), minor
Local time
UTC
1985-10-12 08:11:13 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
33.870° S, 72.118° W
Region
Chile
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.

Depth from
OPERATOR_ASSIGNED

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.352 km WSW of San Antonio, Chile · 14956 days ago · 33 km deep · 5 km away
  2. 3.560 km WSW of San Antonio, Chile · 14955 days ago · 33 km deep · 13 km away
  3. 4.449 km WNW of Cartagena, Chile · 14953 days ago · 33 km deep · 49 km away
  4. 4.446 km WSW of Valparaíso, Chile · 14946 days ago · 33 km deep · 82 km away
  5. 4.694 km N of Constitución, Chile · 14936 days ago · 33 km deep · 75 km away
  6. 4.671 km WSW of Valparaíso, Chile · 14917 days ago · 33 km deep · 71 km away
  7. 4.174 km W of Valparaíso, Chile · 14901 days ago · 22 km deep · 83 km away

Before

  1. 4.553 km SW of San Antonio, Chile · 14956 days ago · 33 km deep · 10 km away
  2. 5.148 km NW of San Vicente, Chile · 14958 days ago · 54 km deep · 68 km away
  3. 5.367 km SW of San Antonio, Chile · 14971 days ago · 33 km deep · 19 km away
  4. 5.73 km SSE of San Antonio, Chile · 14972 days ago · 47 km deep · 55 km away
  5. 3.941 km WNW of Cartagena, Chile · 14977 days ago · 33 km deep · 56 km away
  6. 3.289 km WSW of Valparaíso, Chile · 14985 days ago · 33 km deep · 76 km away
  7. 4.484 km W of San Antonio, Chile · 14985 days ago · 33 km deep · 47 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002kqg. Read Tue, Sep 22, 2026, 10:34 PM UTC.