M4.2 earthquake 149 km N of Calama, Chile
A magnitude 4.2 earthquake struck 149 km N of Calama, Chile on Wed, Oct 3, 2018, 9:36 PM GMT-3 (00:36 UTC), 117 km (73 mi) below the surface.
A larger quake followed: M4.5 77 km NNE of Calama, 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
- 2018-10-04 00:36:47 UTC
- Depth
- 116.7 km (72.5 mi), intermediate-depth
- Epicenter
- 21.104° S, 68.917° 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
- Normal
- Moment magnitude
- 4.2 Mwr
- Nodal plane 1
- Strike 353°, dip 66°, rake -73°
- Nodal plane 2
- Strike 136°, dip 29°, rake -123°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 5.0 km horizontally, 5.5 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- From location
- Station coverage gap
- 61°
- Stations used
- 48
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 9 in the 30 days before it.
After
- 4.4153 km N of Calama, Chile · 2911 days ago · 133 km deep · 11 km away
- 4.3162 km N of Calama, Chile · 2908 days ago · 113 km deep · 16 km away
- 4.2139 km N of Calama, Chile · 2905 days ago · 122 km deep · 13 km away
- 4.2121 km ESE of Iquique, Chile · 2901 days ago · 96 km deep · 60 km away
- 4.360 km NNE of Calama, Chile · 2896 days ago · 105 km deep · 98 km away · felt by 1
- 4.0150 km N of Calama, Chile · 2894 days ago · 141 km deep · 28 km away
- 4.4122 km E of Iquique, Chile · 2892 days ago · 106 km deep · 79 km away · felt by 1
- 4.577 km NNE of Calama, Chile · 2886 days ago · 126 km deep · 86 km away
- 4.5132 km N of Calama, Chile · 2886 days ago · 115 km deep · 18 km away
- 4.5152 km N of Calama, Chile · 2880 days ago · 113 km deep · 4 km away
- 4.1141 km N of Calama, Chile · 2880 days ago · 113 km deep · 29 km away
- 4.1151 km N of Calama, Chile · 2873 days ago · 144 km deep · 24 km away
Before
- 4.388 km E of Iquique, Chile · 2922 days ago · 88 km deep · 98 km away · felt by 1
- 4.6117 km NE of Calama, Chile · 2926 days ago · 115 km deep · 88 km away
- 4.3129 km ESE of Iquique, Chile · 2926 days ago · 123 km deep · 38 km away
- 4.5119 km NNE of Calama, Chile · 2927 days ago · 115 km deep · 70 km away
- 4.4169 km NNE of Calama, Chile · 2928 days ago · 115 km deep · 51 km away
- 4.5147 km N of Calama, Chile · 2930 days ago · 124 km deep · 5 km away · felt by 2
- 4.3157 km NNE of Calama, Chile · 2935 days ago · 136 km deep · 37 km away
- 4.275 km N of Calama, Chile · 2937 days ago · 108 km deep · 77 km away
- 4.384 km NNE of Calama, Chile · 2948 days ago · 125 km deep · 82 km away · felt by 1
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000h6q1. Read Fri, Oct 2, 2026, 1:51 AM UTC.