M4.2 earthquake 87 km WSW of San Antonio, Chile
A magnitude 4.2 earthquake struck 87 km WSW of San Antonio, Chile on Sun, Oct 22, 2017, 11:59 PM GMT-3 (02:59 UTC), 14 km (9 mi) below the surface.
A larger quake followed: M4.5 84 km WSW of San Antonio, Chile. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (Mwr, regional moment), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-10-23 02:59:55 UTC
- Depth
- 14.0 km (8.7 mi), shallow
- Epicenter
- 33.911° S, 72.472° 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
- 4.2 Mwr
- Nodal plane 1
- Strike 26°, dip 32°, rake 119°
- Nodal plane 2
- Strike 173°, dip 63°, rake 74°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 4.0 km horizontally, 1.4 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 80°
- Stations used
- 60
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.584 km WSW of San Antonio, Chile · 3265 days ago · 14 km deep · 3 km away · felt by 30
- 4.557 km WSW of Valparaíso, Chile · 3221 days ago · 15 km deep · 83 km away · felt by 9
- 4.155 km W of Cartagena, Chile · 3220 days ago · 11 km deep · 51 km away
- 4.588 km WSW of San Antonio, Chile · 3206 days ago · 10 km deep · 4 km away · felt by 18
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000avt3. Read Thu, Oct 1, 2026, 3:55 AM UTC.