Chile earthquakes

M4.0 earthquake 121 km WNW of Illapel, Chile

A magnitude 4.0 earthquake struck 121 km WNW of Illapel, Chile on Wed, Oct 28, 2020, 10:45 AM GMT-3 (13:45 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M4.7 36 km WSW of Illapel, Chile. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
4.0 (Mwr, regional moment), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-10-28 13:45:33 UTC
Depth
15.2 km (9.5 mi), shallow
Epicenter
31.378° S, 72.413° 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting
Strike-slip
Moment magnitude
4.0 Mwr
Nodal plane 1
Strike 274°, dip 89°, rake -174°
Nodal plane 2
Strike 183°, dip 84°, rake -1°

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 4.9 km horizontally, 5.5 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
162°
Stations used
37

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.3Off the coast of Coquimbo, Chile · 2151 days ago · 10 km deep · 91 km away
  2. 4.736 km WSW of Illapel, Chile · 2149 days ago · 47 km deep · 94 km away · felt by 5
  3. 4.458 km W of Ovalle, Chile · 2140 days ago · 21 km deep · 97 km away
  4. 4.164 km NW of La Ligua, Chile · 2123 days ago · 35 km deep · 99 km away · felt by 3
  5. 4.5102 km WNW of Illapel, Chile · 2108 days ago · 21 km deep · 20 km away · felt by 1

Before

  1. 4.047 km SW of Ovalle, Chile · 2176 days ago · 53 km deep · 98 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000c6ry. Read Fri, Oct 2, 2026, 11:39 AM UTC.