M4.7 earthquake 120 km ESE of Arica, Chile
A magnitude 4.7 earthquake struck 120 km ESE of Arica, Chile on Tue, Feb 20, 2018, 10:07 PM GMT-3 (01:07 UTC), 109 km (68 mi) below the surface.
A larger quake followed: M5.0 118 km SW of Curahuara de Carangas, Bolivia. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (Mwr, regional moment), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-02-21 01:07:09 UTC
- Depth
- 109.5 km (68.0 mi), intermediate-depth
- Epicenter
- 18.957° S, 69.270° W
- Region
- Chile
- Felt reports
- 1
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.
Fault motion and ground failure
How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.
- Faulting
- Normal
- Moment magnitude
- 4.7 Mwr
- Nodal plane 1
- Strike 335°, dip 56°, rake -111°
- Nodal plane 2
- Strike 190°, dip 40°, rake -62°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 5.5 km horizontally, 3.9 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 38°
- Stations used
- 156
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 2 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.0118 km SW of Curahuara de Carangas, Bolivia · 3119 days ago · 131 km deep · 31 km away · felt by 3
- 4.361 km SSE of Palca, Peru · 3093 days ago · 136 km deep · 88 km away
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000d5nf. Read Thu, Oct 1, 2026, 3:26 AM UTC.