Very strong mag. 6.3 earthquake - Gulf of Alaska, 32 mi southeast of Sitkinak Island, Kodiak Island County, Alaska, USA, on Sunday, 5 April 1964 at 01:22 (GMT)
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Very strong magnitude 6.3 earthquake at 20 km depth
Date & time: 5 Apr 1964 01:22:15 UTC
Magnitude: 6.3
Depth: 20.0 km
Epicenter latitude / longitude: 56.305°N / 153.446°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Unnamed 57.87°N/155.42°W (211 km / 131 mi)
Nearby towns and cities:
84 km (52 mi) SSE of Akhiok (pop: 72) --> See nearby quakes!
100 km (62 mi) S of Old Harbor (pop: 221) --> See nearby quakes!
160 km (100 mi) SSW of Womens Bay (pop: 719) --> See nearby quakes!
170 km (106 mi) SSW of Kodiak Station (pop: 1,300) --> See nearby quakes!
177 km (110 mi) SSW of Kodiak (pop: 6,250) --> See nearby quakes!
388 km (241 mi) SSW of Homer (pop: 5,520) --> See nearby quakes!
398 km (247 mi) SSW of Anchor Point (pop: 1,930) --> See nearby quakes!
402 km (250 mi) SSW of Fritz Creek (pop: 1,930) --> See nearby quakes!
453 km (282 mi) ENE of Sand Point (pop: 1,060) --> See nearby quakes!
483 km (300 mi) SSW of Lowell Point (pop: 2,790) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 atomic bombs!) More info
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.
| Magnitude | Depth | Location | Source |
| M 6.3 | 20 km | Kodiak Island region, Alaska (USA) | 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 yet. If you felt it be the first to report it!
Aftershocks
More info
Recorded aftershocks, latest first (9 quakes):- 12 May 1964 18:16 UTC| M 6.3 |20 km (12.4 mi) depth|61 km (38 mi) distance| USGS | Very strong mag. 6.3 earthquake - Gulf of Alaska, 53 mi southeast of Twoheaded Island, Kodiak Island County, Alaska, USA, on Tuesday, 12 May 1964 at 18:16 (GMT)
- 08 May 1964 16:21 UTC| M 5.8 |24 km (14.9 mi) depth|50 km (31 mi) distance| USGS | Details
- 06 May 1964 15:26 UTC| M 5.9 |20 km (12.4 mi) depth|84 km (52 mi) distance| USGS | Details
- 18 Apr 1964 20:16 UTC| M 5.8 |22.5 km (14 mi) depth|30 km (19 mi) distance| USGS | Details
- 17 Apr 1964 04:49 UTC| M 6.1 |20 km (12.4 mi) depth|31 km (19 mi) distance| USGS | Very strong mag. 6.1 earthquake - Gulf of Alaska, 45 mi southeast of Twoheaded Island, Kodiak Island County, Alaska, USA, on Friday, 17 April 1964 at 04:49 (GMT)
- 16 Apr 1964 19:26 UTC| M 6.4 |25 km (15.5 mi) depth|27 km (17 mi) distance| USGS | Very strong mag. 6.4 earthquake - Gulf of Alaska, 46 mi southeast of Twoheaded Island, Kodiak Island County, Alaska, USA, on Thursday, 16 April 1964 at 19:26 (GMT)
- 15 Apr 1964 15:30 UTC| M 6.1 |25.6 km (15.9 mi) depth|59 km (36 mi) distance| USGS | Very strong mag. 6.1 earthquake - Gulf of Alaska, 5.7 mi south of Trinity s Island, Kodiak Island County, Alaska, USA, on Wednesday, 15 April 1964 at 15:30 (GMT)
- 12 Apr 1964 01:24 UTC| M 6.3 |15 km (9.3 mi) depth|69 km (43 mi) distance| USGS | Very strong mag. 6.3 earthquake - Gulf of Alaska, 93 mi south of Kodiak, Alaska, USA, on Sunday, 12 April 1964 at 01:24 (GMT)
- 05 Apr 1964 01:41 UTC| M 6.0 |24.9 km (15.5 mi) depth|25 km (15 mi) distance| USGS | Strong mag. 6.0 earthquake - Gulf of Alaska, 36 mi southeast of Sitkinak Island, Kodiak Island County, Alaska, USA, on Sunday, 5 April 1964 at 01:41 (GMT)
Earlier earthquakes in the same area
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