M4.5 earthquake 84 km WSW of San Antonio, Chile
A magnitude 4.5 earthquake struck 84 km WSW of San Antonio, Chile on Mon, Oct 23, 2017, 12:21 AM GMT-3 (03:21 UTC), 14 km (9 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mwr), light
- Local time
- UTC
- 2017-10-23 03:21:15 UTC
- Depth
- 14.5 km (9.0 mi), shallow
- Epicenter
- 33.901° S, 72.441° W
- Region
- Chile
- Felt reports
- 30
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
30 people reported to the USGS what they felt; the strongest reported shaking was V, moderate 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
- 4.5 Mwr
- Nodal plane 1
- Strike 14°, dip 29°, rake 103°
- Nodal plane 2
- Strike 180°, dip 62°, rake 83°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 4.4 km horizontally, 2.4 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 82°
- Stations used
- 90
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.557 km WSW of Valparaíso, Chile · 3220 days ago · 15 km deep · 81 km away · felt by 9
- 4.155 km W of Cartagena, Chile · 3219 days ago · 11 km deep · 49 km away
- 4.588 km WSW of San Antonio, Chile · 3205 days ago · 10 km deep · 6 km away · felt by 18
Before
- 4.287 km WSW of San Antonio, Chile · 3264 days ago · 14 km deep · 3 km away
- 4.056 km W of Valparaíso, Chile · 3274 days ago · 20 km deep · 98 km away · felt by 29
- 4.331 km NW of Santa Cruz, Chile · 3278 days ago · 48 km deep · 97 km away · felt by 1
- 4.916 km S of San Antonio, Chile · 3293 days ago · 46 km deep · 80 km away · felt by 195
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000avta. Read Wed, Sep 30, 2026, 2:59 AM UTC.