Chile earthquakes

M4.2 earthquake 50 km W of Valparaíso, Chile

A magnitude 4.2 earthquake struck 50 km W of Valparaíso, Chile on Mon, Aug 28, 2017, 7:08 PM GMT-3 (22:08 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M4.9 16 km S of San Antonio, Chile. This one was a foreshock.

Valparaíso 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
4.2 (mwr), light
Local time
UTC
2017-08-28 22:08:28 UTC
Depth
18.0 km (11.2 mi), shallow
Epicenter
33.013° S, 72.165° W
Region
Chile
Felt reports
31
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

31 people reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

Fault motion and ground failure

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

Faulting
Oblique reverse
Moment magnitude
4.2 Mwr
Nodal plane 1
Strike 30°, dip 23°, rake 127°
Nodal plane 2
Strike 171°, dip 72°, rake 76°

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 4.9 km horizontally, 3.5 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
166°
Stations used
51

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.058 km W of Valparaíso, Chile · 3308 days ago · 16 km deep · 13 km away
  2. 4.916 km S of San Antonio, Chile · 3290 days ago · 46 km deep · 97 km away · felt by 195
  3. 4.351 km NW of Valparaíso, Chile · 3288 days ago · 24 km deep · 40 km away · felt by 45
  4. 4.035 km W of Valparaíso, Chile · 3280 days ago · 19 km deep · 15 km away · felt by 34
  5. 4.161 km W of La Ligua, Chile · 3276 days ago · 20 km deep · 64 km away · felt by 103
  6. 4.045 km W of Valparaíso, Chile · 3275 days ago · 16 km deep · 5 km away
  7. 3.710 km SSW of Valparaíso, Chile · 3271 days ago · 30 km deep · 47 km away · felt by 42
  8. 4.056 km W of Valparaíso, Chile · 3270 days ago · 20 km deep · 7 km away · felt by 29

Before

  1. 4.330 km WNW of Hacienda La Calera, Chile · 3322 days ago · 28 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000acnw. Read Sat, Sep 26, 2026, 11:07 AM UTC.