Very strong mag. 6.1 earthquake - Gulf of Alaska, 44 mi southeast of Twoheaded Island, Kodiak Island County, Alaska, USA, on Saturday, 4 April 1964 at 08:40 (GMT)
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Very strong magnitude 6.1 earthquake at 20 km depth
Date & time: 4 Apr 1964 08:40:33 UTC
Magnitude: 6.1
Depth: 20.0 km
Epicenter latitude / longitude: 56.401°N / 152.852°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Unnamed 57.87°N/155.42°W (225 km / 140 mi)
Nearby towns and cities:
93 km (58 mi) SSE of Old Harbor (pop: 221) --> See nearby quakes!
101 km (63 mi) SE of Akhiok (pop: 72) --> See nearby quakes!
143 km (89 mi) S of Womens Bay (pop: 719) --> See nearby quakes!
153 km (95 mi) S of Kodiak Station (pop: 1,300) --> See nearby quakes!
157 km (97 mi) S of Kodiak (pop: 6,250) --> See nearby quakes!
369 km (229 mi) SSW of Homer (pop: 5,520) --> See nearby quakes!
380 km (236 mi) S of Anchor Point (pop: 1,930) --> See nearby quakes!
382 km (237 mi) SSW of Fritz Creek (pop: 1,930) --> See nearby quakes!
456 km (283 mi) SSW of Kalifornsky (pop: 7,850) --> See nearby quakes!
458 km (284 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 (9 quakes):- 12 May 1964 18:16 UTC| M 6.3 |20 km (12.4 mi) depth|23 km (14 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|46 km (29 mi) distance| USGS | Details
- 18 Apr 1964 20:16 UTC| M 5.8 |22.5 km (14 mi) depth|67 km (42 mi) distance| USGS | Details
- 17 Apr 1964 04:49 UTC| M 6.1 |20 km (12.4 mi) depth|8 km (5 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|14 km (9 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)
- 12 Apr 1964 01:24 UTC| M 6.3 |15 km (9.3 mi) depth|31 km (19 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|59 km (37 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)
- 05 Apr 1964 01:22 UTC| M 6.3 |20 km (12.4 mi) depth|38 km (24 mi) distance| USGS | 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)
- 04 Apr 1964 09:10 UTC| M 5.9 |20.6 km (12.8 mi) depth|46 km (29 mi) distance| USGS | Details
Earlier earthquakes in the same area since 1900
- Date / time UTC| Mag |Depth|Age|Distance| Details
- 09 Oct 1900 12:25| 7.9 |unknown|120 years ago|86km / 53mi| Gulf of Alaska, 10.2 mi SW of Old Harbor, Kodiak Island County, Alaska, USA
- 07 Nov 1912 07:40| 7.3 |90km / 56mi|108 years ago|179km / 111mi| Gulf of Alaska, 57 mi W of Kodiak Island, Alaska, USA
- 23 Dec 1906 17:22| 7.3 |unknown|114 years ago|81km / 51mi| 12 mi SE of Akhiok, Kodiak Island County, Alaska, USA
- 10 Apr 1957 11:30| 7.0 |15km / 9.3mi|64 years ago|91km / 56mi| Gulf of Alaska, 145 mi SW of Kodiak, Alaska, USA
- 05 Dec 1912 12:27| 6.9 |90km / 56mi|108 years ago|141km / 87mi| 2.9 mi S of Larsen Bay, Kodiak Island County, Alaska, USA
- 29 Nov 1952 23:46| 6.8 |20km / 12.4mi|68 years ago|75km / 47mi| Gulf of Alaska, 17 mi S of Sitkinak Island, Kodiak Island County, Alaska, USA
- 30 Mar 1964 02:18| 6.7 |18.6km / 11.6mi|57 years ago|11km / 7mi| Gulf of Alaska, 41 mi SE of Twoheaded Island, Kodiak Island County, Alaska, USA
- 28 Mar 1964 12:20| 6.6 |25km / 16mi|57 years ago|76km / 47mi| Gulf of Alaska, 14 mi S of Sitkinak Island, Kodiak Island County, Alaska, USA
- 28 Mar 1964 14:46| 6.5 |25km / 16mi|57 years ago|85km / 53mi| Gulf of Alaska, 20 mi S of Sitkinak Island, Kodiak Island County, Alaska, USA
- 28 Mar 1964 09:01| 6.5 |15km / 9.3mi|57 years ago|45km / 28mi| Gulf of Alaska, 97 mi S of Kodiak, Alaska, USA
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