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Strong mag. 6.4 earthquake - 34 km east of Calama, Provincia de El Loa, Antofagasta, Chile, on Tuesday, December 11, 1984 at 23:22 GMT

Strong magnitude 6.4 earthquake at 92 km depth

Earthquake details

Date & time	Dec 11, 1984 23:22:19 UTC
Local time at epicenter
Status	Confirmed
Magnitude	6.4
Depth	91.5 km
Epicenter latitude / longitude	22.407°S / 68.599°W (El Loa, Antofagasta, Chile)
Antipode	22.407°N / 111.401°E
Shaking intensity	Moderate shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Paniri (51 km / 32 mi)
Nearby towns and cities	34 km (21 mi) E of Calama (pop: 143,100) \| Show on map \| Quakes nearby 69 km (43 mi) NW of San Pedro de Atacama (pop: 2,000) \| Show on map \| Quakes nearby 168 km (105 mi) ESE of Tocopilla (pop: 24,500) \| Show on map \| Quakes nearby 230 km (143 mi) NE of Antofagasta (pop: 309,800) \| Show on map \| Quakes nearby 292 km (182 mi) SE of Iquique (Tarapacá) (pop: 191,500) \| Show on map \| Quakes nearby 392 km (243 mi) WNW of Jujuy (Argentina) (pop: 305,900) \| Show on map \| Quakes nearby 411 km (255 mi) WSW of Tarija (Bolivia) (pop: 159,300) \| Show on map \| Quakes nearby 419 km (260 mi) NW of Salta (Argentina) (pop: 512,700) \| Show on map \| Quakes nearby 431 km (268 mi) SW of Ciudad Potosi (Potosí, Bolivia) (pop: 141,300) \| Show on map \| Quakes nearby 511 km (318 mi) SW of Sucre (Chuquisaca, Bolivia) (pop: 224,800) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	2.5 x 10¹⁴ joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 atomic bombs!) \| about seismic energy

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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag.	Depth	Location	Source
6.4	92 km	Antofagasta, Chile	USGS

Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

There are no user reports for this quake.

Aftershocks

[More info]

Recorded aftershocks, latest first (7 quakes)

Date and time	Mag Depth	Location	Details
May 28, 1985 19:19 38 years ago	4.5 150 km	90 km NE of Calama, Provincia de El Loa, Antofagasta, Chile	More
May 27, 1985 11:32 38 years ago	4.9 96 km	46 km SE of Calama, Provincia de El Loa, Antofagasta, Chile	More
May 8, 1985 22:11 38 years ago	4.3 143 km	71 km N of Calama, Provincia de El Loa, Antofagasta, Chile	More
May 7, 1985 19:23 38 years ago	4.6 86 km	76 km NE of Calama, Provincia de El Loa, Antofagasta, Chile	More
Apr 9, 1985 09:50 38 years ago	4.3 139 km	66 km S of Calama, Provincia de El Loa, Antofagasta, Chile	More
Jan 13, 1985 16:00 38 years ago	5.0 103 km	55 km SE of Calama, Provincia de El Loa, Antofagasta, Chile	More
Dec 20, 1984 15:25 38 years ago	4.9 117 km	74 km E of Calama, Provincia de El Loa, Antofagasta, Chile	More

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