Strong mag. 6.1 earthquake - North Pacific Ocean, 48 km south of Retalhuleu, Guatemala, on Tuesday, December 31, 1974 at 20:21 (GMT)

Strong mag. 6.1 earthquake - North Pacific Ocean, 48 km south of Retalhuleu, Guatemala, on Tuesday, December 31, 1974 at 20:21 (GMT)

Strong magnitude 6.1 earthquake at 39 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Dec 31, 1974 20:21:09 UTC
Magnitude: 6.1
Depth: 39.0 km
Epicenter latitude / longitude: 14.126°N / 91.824°W (North Pacific Ocean, Guatemala)
Antipode: 14.126°S / 88.176°E
Nearest volcano: Santo Tomas (75 km / 47 mi)
Nearby towns and cities:
21 km (13 mi) SSE of Champerico (pop: 7,760) --> See nearby quakes!
48 km (30 mi) SSW of Retalhuleu (pop: 36,700) --> See nearby quakes!
53 km (33 mi) WSW of Tiquisate (pop: 18,200) --> See nearby quakes!
54 km (33 mi) SSW of Nuevo San Carlos (pop: 19,200) --> See nearby quakes!
64 km (40 mi) S of Coatepec (pop: 45,700) --> See nearby quakes!
85 km (53 mi) SSW of Quetzaltenango (pop: 132,200) --> See nearby quakes!
89 km (56 mi) WSW of Santa Lucia Cotzumalguapa (pop: 62,100) --> See nearby quakes!
100 km (62 mi) SW of Solola (pop: 45,400) --> See nearby quakes!
143 km (89 mi) WSW of Mixco (pop: 473,100) --> See nearby quakes!
152 km (95 mi) WSW of Guatemala (pop: 994,900) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 8.9 x 1013 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) More info
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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.DepthLocationSource
6.139 kmoffshore GuatemalaUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

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.
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Aftershocks

[More info]

Recorded aftershocks, latest first (7 quakes)

Date and timeMag
Depth
LocationDetails
Apr 4, 1975 14:36
47 years ago
4.2

143 km
23 km SE of Mazatenango, Suchitepeque, GuatemalaMore
Jan 21, 1975 00:36
47 years ago
4.4

106 km
North Pacific Ocean, 52 km W of Retalhuleu, GuatemalaMore
Jan 11, 1975 18:07
47 years ago
4.6

104 km
6.2 km E of Mazatenango, Suchitepeque, GuatemalaMore
Jan 9, 1975 06:12
47 years ago
4.6

59 km
North Pacific Ocean, 71 km SW of Retalhuleu, GuatemalaMore
Jan 1, 1975 23:41
47 years ago
4.4

108 km
North Pacific Ocean, 39 km SW of Retalhuleu, GuatemalaMore
Jan 1, 1975 22:52
47 years ago
5.0

80 km
North Pacific Ocean, 87 km SW of Quetzaltenango, GuatemalaMore
Dec 31, 1974 21:56
47 years ago
4.9

75 km
North Pacific Ocean, 47 km SW of Retalhuleu, GuatemalaMore

Earlier earthquakes in the same area

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