M4.2 earthquake 70 km SW of San Antonio, Chile
A magnitude 4.2 earthquake struck 70 km SW of San Antonio, Chile on Sun, Sep 25, 2016, 11:57 PM GMT-3 (02:57 UTC), 20 km (13 mi) below the surface.
A larger quake followed: M6.0 88 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
- 2016-09-26 02:57:39 UTC
- Depth
- 20.2 km (12.6 mi), shallow
- Epicenter
- 33.957° S, 72.233° W
- Region
- Chile
- Felt reports
- 1
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Felt (III) at La Estrella and Litueche; (II) at San Antonio and Santo Domingo. Also felt at Vina del Mar.
From the USGS event page for us10006sn5. U.S. Geological Survey text and figures are in the public domain.
Did you feel it?
1 person 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
- 4.2 Mwr
- Nodal plane 1
- Strike 188°, dip 73°, rake 65°
- Nodal plane 2
- Strike 65°, dip 30°, rake 143°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 3.3 km horizontally, 4.7 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 76°
- Stations used
- 64
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.2Off the coast of Valparaiso, Chile · 3657 days ago · 20 km deep · 0 km away
- 4.018 km SW of San Antonio, Chile · 3637 days ago · 34 km deep · 52 km away · felt by 2
- 6.088 km WSW of San Antonio, Chile · 3626 days ago · 13 km deep · 34 km away · felt by 14
- 4.396 km W of San Antonio, Chile · 3626 days ago · 15 km deep · 42 km away
- 5.294 km WSW of San Antonio, Chile · 3624 days ago · 10 km deep · 35 km away · felt by 1
- 4.985 km WSW of San Antonio, Chile · 3623 days ago · 9 km deep · 34 km away · felt by 5
- 3.943 km S of San Antonio, Chile · 3600 days ago · 41 km deep · 51 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us10006sn5. Read Fri, Oct 2, 2026, 6:30 AM UTC.