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Very strong mag. 6.1 earthquake - Gulf of Alaska, 88 mi south of Kodiak, Alaska, USA, on Thursday, 1 August 1974 at 05:07 (GMT)
Very strong magnitude 6.1 earthquake at 10 km depth
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Date & time: 1 Aug 1974 05:07:59 UTC
Magnitude: 6.1Depth: 10.0 km
Epicenter latitude / longitude: 56.516°N / 152.315°W
(
Gulf of Alaska,
Alaska,
United States)
Nearest volcano:
Unnamed 57.87°N/155.42°W (240 km / 149 mi)
Nearby towns and cities:97 km (60 mi) SE of Old Harbor (pop: 221) -->
See nearby quakes!140 km (87 mi) S of Kodiak Station (pop: 1,300) -->
See nearby quakes!142 km (88 mi) S of Kodiak (pop: 6,250) -->
See nearby quakes!351 km (218 mi) S of Homer (pop: 5,520) -->
See nearby quakes!363 km (226 mi) S of Fritz Creek (pop: 1,930) -->
See nearby quakes!364 km (226 mi) S of Anchor Point (pop: 1,930) -->
See nearby quakes!438 km (272 mi) S of Kalifornsky (pop: 7,850) -->
See nearby quakes!448 km (278 mi) S of Soldotna (pop: 4,540) -->
See nearby quakes!453 km (282 mi) S of Kenai (pop: 7,660) -->
See nearby quakes!456 km (283 mi) SSW of Sterling (pop: 5,620) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 8.9 x 10
13 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 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 6.1 | 10 km | Kodiak Island region, 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. 126 km
2 (=49 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 19 km (12 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).
14 Nov 1974 11:55 UTC
| M 3.7 | 33 km (20.5 mi) depth
| 55 km (34 mi) distance
| USGS | Details17 Sep 1974 02:01 UTC
| M 5.1 | 17 km (10.6 mi) depth
| 47 km (29 mi) distance
| USGS | Details07 Aug 1974 15:59 UTC
| M 4.5 | 33 km (20.5 mi) depth
| 33 km (21 mi) distance
| USGS | Details07 Aug 1974 15:30 UTC
| M 4.6 | 33 km (20.5 mi) depth
| 26 km (16 mi) distance
| USGS | Details07 Aug 1974 08:50 UTC
| M 3.9 | 67 km (41.6 mi) depth
| 38 km (23 mi) distance
| USGS | Details07 Aug 1974 08:23 UTC
| M 5.3 | 33 km (20.5 mi) depth
| 15 km (9 mi) distance
| USGS | Details07 Aug 1974 08:21 UTC
| M 4.6 | 32 km (19.9 mi) depth
| 30 km (18 mi) distance
| USGS | Details06 Aug 1974 18:05 UTC
| M 4.6 | 33 km (20.5 mi) depth
| 24 km (15 mi) distance
| USGS | Details06 Aug 1974 12:59 UTC
| M 4.7 | 16 km (9.9 mi) depth
| 10 km (6 mi) distance
| USGS | Details04 Aug 1974 21:36 UTC
| M 4.3 | 40 km (24.9 mi) depth
| 33 km (20 mi) distance
| USGS | Details03 Aug 1974 20:03 UTC
| M 4.1 | 33 km (20.5 mi) depth
| 11 km (7 mi) distance
| USGS | Details02 Aug 1974 17:03 UTC
| M 4.1 | 36 km (22.4 mi) depth
| 10 km (6 mi) distance
| USGS | Details02 Aug 1974 09:22 UTC
| M 4.0 | 64 km (39.8 mi) depth
| 63 km (39 mi) distance
| USGS | Details01 Aug 1974 15:29 UTC
| M 4.0 | 33 km (20.5 mi) depth
| 29 km (18 mi) distance
| USGS | Details01 Aug 1974 14:05 UTC
| M 3.8 | 33 km (20.5 mi) depth
| 24 km (15 mi) distance
| USGS | Details01 Aug 1974 08:26 UTC
| M 3.9 | 33 km (20.5 mi) depth
| 16 km (10 mi) distance
| USGS | DetailsShow all
01 Aug 1974 08:17 UTC
| M 4.1 | 33 km (20.5 mi) depth
| 20 km (13 mi) distance
| USGS | Details01 Aug 1974 07:59 UTC
| M 6.0 | 33 km (20.5 mi) depth
| 13 km (8 mi) distance
| USGS | Strong mag. 6.0 earthquake - Gulf of Alaska, 80 mi south of Kodiak, Alaska, USA, on Thursday, 1 August 1974 at 07:59 (GMT)01 Aug 1974 07:44 UTC
| M 3.8 | 33 km (20.5 mi) depth
| 31 km (19 mi) distance
| USGS | Details01 Aug 1974 07:18 UTC
| M 4.2 | 16 km (9.9 mi) depth
| 18 km (11 mi) distance
| USGS | Details01 Aug 1974 07:15 UTC
| M 3.9 | 33 km (20.5 mi) depth
| 37 km (23 mi) distance
| USGS | Details01 Aug 1974 07:10 UTC
| M 4.3 | 15 km (9.3 mi) depth
| 22 km (14 mi) distance
| USGS | Details01 Aug 1974 06:48 UTC
| M 4.4 | 16 km (9.9 mi) depth
| 23 km (14 mi) distance
| USGS | Details01 Aug 1974 06:36 UTC
| M 3.8 | 27 km (16.8 mi) depth
| 19 km (12 mi) distance
| USGS | Details01 Aug 1974 06:32 UTC
| M 4.3 | 7 km (4.3 mi) depth
| 22 km (14 mi) distance
| USGS | Details01 Aug 1974 06:17 UTC
| M 4.5 | 19 km (11.8 mi) depth
| 21 km (13 mi) distance
| USGS | Details01 Aug 1974 06:14 UTC
| M 3.8 | 33 km (20.5 mi) depth
| 33 km (21 mi) distance
| USGS | Details01 Aug 1974 06:07 UTC
| M 4.6 | 15 km (9.3 mi) depth
| 10 km (6 mi) distance
| USGS | Details01 Aug 1974 05:55 UTC
| M 6.3 | 33 km (20.5 mi) depth
| 21 km (13 mi) distance
| USGS | Very strong mag. 6.3 earthquake - Gulf of Alaska, 78 mi south of Kodiak, Alaska, USA, on Thursday, 1 August 1974 at 05:55 (GMT)
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