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)
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Very strong magnitude 6.1 earthquake at 20 km depth
Date & time: 17 Apr 1964 04:49:32 UTC
Magnitude: 6.1
Depth: 20.0 km
Epicenter latitude / longitude: 56.348°N / 152.946°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Unnamed 57.87°N/155.42°W (226 km / 140 mi)
Nearby towns and cities:
98 km (61 mi) SSE of Old Harbor (pop: 221) --> See nearby quakes!
100 km (62 mi) SE of Akhiok (pop: 72) --> See nearby quakes!
149 km (93 mi) S of Womens Bay (pop: 719) --> See nearby quakes!
159 km (99 mi) S of Kodiak Station (pop: 1,300) --> See nearby quakes!
164 km (102 mi) S of Kodiak (pop: 6,250) --> See nearby quakes!
376 km (233 mi) SSW of Homer (pop: 5,520) --> See nearby quakes!
387 km (240 mi) S of Anchor Point (pop: 1,930) --> See nearby quakes!
389 km (242 mi) SSW of Fritz Creek (pop: 1,930) --> See nearby quakes!
457 km (284 mi) SSW of Cohoe (pop: 1,360) --> See nearby quakes!
465 km (289 mi) SSW of Lowell Point (pop: 2,790) --> 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
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 6.1 | 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 (3 quakes):- 12 May 1964 18:16 UTC| M 6.3 |20 km (12.4 mi) depth|30 km (18 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)
- 06 May 1964 15:26 UTC| M 5.9 |20 km (12.4 mi) depth|54 km (34 mi) distance| USGS | Details
- 18 Apr 1964 20:16 UTC| M 5.8 |22.5 km (14 mi) depth|59 km (37 mi) distance| USGS | Details
Earlier earthquakes in the same area
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