M4.0 earthquake 89 km W of Illapel, Chile
A magnitude 4.0 earthquake struck 89 km W of Illapel, Chile on Mon, Oct 4, 2021, 9:42 AM GMT-3 (12:42 UTC), 18 km (11 mi) below the surface.
A larger quake followed: M4.4 83 km W of Illapel, Chile. 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 (Mwr, regional moment), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-10-04 12:42:24 UTC
- Depth
- 17.7 km (11.0 mi), shallow
- Epicenter
- 31.710° S, 72.106° 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
- Reverse (thrust)
- Moment magnitude
- 4.0 Mwr
- Nodal plane 1
- Strike 348°, dip 39°, rake 83°
- Nodal plane 2
- Strike 178°, dip 51°, rake 96°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 4.9 km horizontally, 4.6 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 161°
- Stations used
- 41
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 13 in the 30 days before it.
After
- 4.389 km W of Illapel, Chile · 1815 days ago · 10 km deep · 3 km away · felt by 2
- 4.178 km W of Illapel, Chile · 1814 days ago · 18 km deep · 10 km away
- 4.483 km W of Illapel, Chile · 1814 days ago · 10 km deep · 6 km away · felt by 1
- 3.983 km W of Illapel, Chile · 1814 days ago · 16 km deep · 6 km away
- 4.280 km W of Illapel, Chile · 1811 days ago · 20 km deep · 11 km away · felt by 5
- 4.080 km WNW of Illapel, Chile · 1798 days ago · 12 km deep · 45 km away · felt by 4
- 4.449 km SW of Illapel, Chile · 1774 days ago · 44 km deep · 58 km away · felt by 1
- 4.065 km W of La Ligua, Chile · 1771 days ago · 21 km deep · 76 km away · felt by 2
Before
- 4.689 km W of Illapel, Chile · 1826 days ago · 17 km deep · 2 km away · felt by 8
- 4.698 km WSW of Illapel, Chile · 1844 days ago · 10 km deep · 14 km away · felt by 7
- 4.698 km WNW of La Ligua, Chile · 1844 days ago · 10 km deep · 45 km away · felt by 1
- 4.4105 km WNW of La Ligua, Chile · 1844 days ago · 20 km deep · 53 km away · felt by 1
- 4.9103 km WNW of La Ligua, Chile · 1845 days ago · 11 km deep · 47 km away · felt by 17
- 4.181 km W of Illapel, Chile · 1845 days ago · 10 km deep · 9 km away
- 4.181 km WSW of Illapel, Chile · 1845 days ago · 20 km deep · 18 km away
- 4.489 km W of Illapel, Chile · 1846 days ago · 11 km deep · 1 km away
- 4.484 km W of Illapel, Chile · 1846 days ago · 10 km deep · 5 km away · felt by 2
- 4.875 km W of Illapel, Chile · 1846 days ago · 13 km deep · 14 km away · felt by 10
- 4.491 km W of Illapel, Chile · 1848 days ago · 5 km deep · 2 km away
- 4.383 km W of Illapel, Chile · 1848 days ago · 10 km deep · 6 km away
- 4.291 km W of Illapel, Chile · 1854 days ago · 19 km deep · 6 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000frjm. Read Sun, Oct 4, 2026, 8:03 AM UTC.