M4.8 earthquake 41 km NNW of Valparaíso, Chile
A magnitude 4.8 earthquake struck 41 km NNW of Valparaíso, Chile on Sat, Jul 31, 2021, 8:14 AM GMT-4 (12:14 UTC), 26 km (16 mi) below the surface.
A larger quake followed: M4.9 103 km WNW of La Ligua, Chile. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (Mwr, regional moment), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-07-31 12:14:25 UTC
- Depth
- 25.7 km (16.0 mi), shallow
- Epicenter
- 32.676° S, 71.756° W
- Region
- Chile
- Felt reports
- 78
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 4.8 | Mwr, regional moment | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.037 · 69 stations |
| 5.18 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
Did you feel it?
78 people reported to the USGS what they felt; the strongest reported shaking was VI, strong shaking.
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
- 4.8 Mwr
- Nodal plane 1
- Strike 19°, dip 25°, rake 103°
- Nodal plane 2
- Strike 185°, dip 66°, rake 84°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 4.1 km horizontally, 3.6 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 52°
- Stations used
- 123
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.13 km S of Quillota, Chile · 1882 days ago · 53 km deep · 54 km away
- 4.181 km WSW of Illapel, Chile · 1845 days ago · 20 km deep · 96 km away
- 4.9103 km WNW of La Ligua, Chile · 1844 days ago · 11 km deep · 78 km away · felt by 17
- 4.4105 km WNW of La Ligua, Chile · 1844 days ago · 20 km deep · 77 km away · felt by 1
- 4.698 km WNW of La Ligua, Chile · 1843 days ago · 10 km deep · 76 km away · felt by 1
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f0z3 (also filed as iscgem620925358). Read Sat, Oct 3, 2026, 8:03 PM UTC.