Strong mag. 5.5 earthquake - North Pacific Ocean, 127 mi east of Unalaska, Aleutians West (CA), Alaska, USA, on Thursday, 27 October 2016 at 12:44 (GMT)
This quake was likely an aftershock of the 5.9 quake North Pacific Ocean, 133 mi east of Unalaska, Aleutians West (CA), Alaska, USA, 27 October 2016 11:53 GMT, which had occurred 52 minutes earlier.
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Strong magnitude 5.5 earthquake at 10 km depth
27 Oct 12:55 UTC: First to report: GFZ after 11 minutes.
Oct 27 12:57: Magnitude recalculated from 5.0 to 5.1.
Oct 27 12:58: Magnitude recalculated from 5.1 to 5.3.
Oct 27 12:58: Magnitude recalculated from 5.3 to 5.4.
Oct 27 12:59: Magnitude recalculated from 5.4 to 5.5.
Oct 27 12:57: Magnitude recalculated from 5.0 to 5.1.
Oct 27 12:58: Magnitude recalculated from 5.1 to 5.3.
Oct 27 12:58: Magnitude recalculated from 5.3 to 5.4.
Oct 27 12:59: Magnitude recalculated from 5.4 to 5.5.
Date & time: 27 Oct 2016 12:44:58 UTC
Magnitude: 5.5
Depth: 10.0 km
Epicenter latitude / longitude: 53.64°N / 163.44°W
(North Pacific Ocean, United States)Nearest volcano: Isanotski (126 km / 78 mi)
Nearby towns and cities:
135 km (84 mi) S of False Pass (pop: 40) --> See nearby quakes!
163 km (101 mi) ESE of Akutan (pop: 1,040) --> See nearby quakes!
174 km (108 mi) SSW of King Cove (pop: 1,010) --> See nearby quakes!
178 km (111 mi) SSW of Cold Bay (pop: 123) --> See nearby quakes!
205 km (127 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
268 km (166 mi) SW of Sand Point (pop: 1,060) --> See nearby quakes!
299 km (186 mi) SSW of Nelson Lagoon (pop: 52) --> See nearby quakes!
374 km (232 mi) SW of Perryville (pop: 113) --> See nearby quakes!
417 km (259 mi) SW of Chignik Lake (pop: 73) --> See nearby quakes!
431 km (268 mi) SW of Chignik Lagoon (pop: 78) --> See nearby quakes!
Primary data source: GFZ (German Research Centre for Geosciences)
Estimated released energy: 1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 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 |
| 5.5 | 10 km | Unimak Island Region, Alaska | GFZ |
| 5.0 | 20 km | UNIMAK ISLAND REGION, ALASKA | EMSC |
| 4.9 | 13 km | - 135km S of False Pass, Alaska | USGS |
User reports for this quake
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