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Very strong mag. 6.0 earthquake - North Pacific Ocean, 46 mi southeast of Herbert Island, Aleutians West County, Alaska, USA, on Sunday, 24 March 1957 at 11:06 (GMT)
Very strong magnitude 6.0 earthquake at 20 km depth
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Date & time: 24 Mar 1957 11:06:14 UTC
Magnitude: 6Depth: 20.0 km
Epicenter latitude / longitude: 52.166°N / 169.62°W
(
North Pacific Ocean,
Alaska,
United States)
Nearest volcano:
Herbert (72 km / 45 mi)
Nearby towns and cities:100 km (62 mi) SSW of Nikolski (pop: 18) -->
See nearby quakes!281 km (174 mi) SW of Unalaska (pop: 4,490) -->
See nearby quakes!312 km (194 mi) E of Atka (pop: 64) -->
See nearby quakes!337 km (209 mi) SW of Akutan (pop: 1,040) -->
See nearby quakes!508 km (315 mi) SW of False Pass (pop: 40) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 6.3 x 10
13 joules (17.5 gigawatt hours, equivalent to 15080 tons of TNT or 0.9 atomic bombs!)
More info[show map]
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Data for the same earthquake reported by different agencies
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| Magnitude | Depth | Location | Source |
| M 6.0 | 20 km | Fox Islands, Aleutian Islands, Alaska (USA) | USGS |
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.
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Aftershocks
More info
Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 100 km
2 (=39 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 17 km (11 mi).
Aftershocks typically occur during the weeks and months following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the
map below to verify).
01 Aug 1957 16:18 UTC
| M 5.6 | 0 km (0 mi) depth
| 32 km (20 mi) distance
| USGS | Details13 Jul 1957 00:59 UTC
| M 5.7 | 25.8 km (16 mi) depth
| 11 km (7 mi) distance
| USGS | Details29 Apr 1957 04:30 UTC
| M 5.6 | 25 km (15.5 mi) depth
| 53 km (33 mi) distance
| USGS | Details09 Apr 1957 20:24 UTC
| M 5.7 | 25 km (15.5 mi) depth
| 39 km (24 mi) distance
| USGS | Details
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