Very strong mag. 6.3 earthquake - Gulf of Alaska, 42 mi southeast of Sitkinak Island, Kodiak Island County, Alaska, USA, on Wednesday, 27 July 1955 at 18:19 (GMT)

Very strong mag. 6.3 earthquake - Gulf of Alaska, 42 mi southeast of Sitkinak Island, Kodiak Island County, Alaska, USA, on Wednesday, 27 July 1955 at 18:19 (GMT)

Very strong magnitude 6.3 earthquake at 25 km depth

Date & time: 27 Jul 1955 18:19:14 UTC
Magnitude: 6.3
Depth: 25.0 km
Epicenter latitude / longitude: 56.086°N / 153.465°W (Gulf of Alaska, Alaska, United States)
Nearest volcano: Unnamed 57.87°N/155.42°W (231 km / 144 mi)
Nearby towns and cities:
105 km (65 mi) SSE of Akhiok (pop: 72) --> See nearby quakes!
125 km (77 mi) S of Old Harbor (pop: 221) --> See nearby quakes!
184 km (114 mi) SSW of Womens Bay (pop: 719) --> See nearby quakes!
194 km (121 mi) SSW of Kodiak Station (pop: 1,300) --> See nearby quakes!
200 km (124 mi) SSW of Kodiak (pop: 6,250) --> See nearby quakes!
411 km (256 mi) SSW of Homer (pop: 5,520) --> See nearby quakes!
422 km (262 mi) SSW of Anchor Point (pop: 1,930) --> See nearby quakes!
426 km (265 mi) SSW of Fritz Creek (pop: 1,930) --> See nearby quakes!
448 km (279 mi) ENE of Sand Point (pop: 1,060) --> See nearby quakes!
505 km (314 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
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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.
MagnitudeDepthLocationSource
M 6.325 kmKodiak Island region, Alaska (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

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Aftershocks

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Recorded aftershocks, latest first (0 quakes):
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Earlier earthquakes in the same area

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