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
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.
|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.
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More infoRecorded 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