Mag. 4.9 earthquake - Gulf of Alaska, 1 mi east of Sand Point, Alaska, USA, on 24 Sep 9:57 pm (GMT -8) -

This quake was likely an aftershock of the 7.8 quake Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East County, Alaska, USA, 22 July 2020 06:12 GMT, which had occurred 9 weeks earlier.

Mag. 4.9 earthquake - Gulf of Alaska, 1 mi east of Sand Point, Alaska, USA, on 24 Sep 9:57 pm (GMT -8)

Light magnitude 4.9 earthquake at 10 km depth

25 Sep 06:04 UTC: First to report: USGS after 6 minutes.
25 Sep 06:11: Magnitude recalculated from 5.4 to 4.9. Hypocenter depth recalculated from 21.0 to 26.3 km (from 13 to 16.3 mi). Epicenter location corrected by 15.5 km (9.6 mi) towards SSW.
25 Sep 06:15: Hypocenter depth recalculated from 26.3 to 10.0 km (from 16.3 to 6.2 mi). Epicenter location corrected by 14.6 km (9.1 mi) towards SSW.

Date & time: 25 Sep 2020 05:57:57 UTC -
Local time at epicenter: 24 Sep 9:57 pm (GMT -8)
Magnitude: 4.9
Depth: 10.0 km
Epicenter latitude / longitude: 55.0499°N / 158.0177°W

(Gulf of Alaska, Alaska, United States)
Nearest volcano: Veniaminof (146 km / 91 mi)
Nearby towns and cities:
119 km (74 mi) SE of Perryville (pop: 113) --> See nearby quakes!
141 km (87 mi) S of Chignik (pop: 87) --> See nearby quakes!
142 km (88 mi) SSE of Chignik Lake (pop: 73) --> See nearby quakes!
161 km (100 mi) E of Sand Point (pop: 1,060) --> See nearby quakes!
214 km (133 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
227 km (141 mi) ESE of Nelson Lagoon (pop: 52) --> See nearby quakes!
274 km (170 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
460 km (286 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6032 km (3748 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6032 km (3748 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
82 km (51 mi) ENE of Simeonof Island --> See nearby quakes!
102 km (64 mi) ENE of Chernabura Island --> See nearby quakes!

Weather at epicenter at time of quake:
Broken Clouds

9.7°C (49 F), humidity: 73%, wind: 3 m/s (5 kts) from NW

Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 10¹² joules (392 megawatt hours, equivalent to 338 tons of TNT) 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.

Magnitude	Depth	Location	Source
M 4.9	10 km	Alaska Peninsula, USA	USGS
M 4.9	24 km	Alaska Peninsula, USA	GFZ
M 4.9	30 km	Alaska Peninsula, USA	EMSC
M 5.0	15 km	Alaska Peninsula, USA	GeoAu
M 5.6	10 km	Alaska Peninsula, USA	BMKG

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User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Perryville (114.1 km NW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / very short (reported through our app)

Portland Oregon / Weak shaking (MMI III) / rattling, vibrating / 20-30 s : This is the only quake in the northern hemisphere at the time. We thought it was closer, but don't see any others. I was already awake, but my wife was awakened by the shaking.

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Earlier earthquakes in the same area

Mag. 4.9 earthquake - Gulf of Alaska, 1 mi east of Sand Point, Alaska, USA, on 24 Sep 9:57 pm (GMT -8)

Click here to search our database for earlier earthquakes in the same area since 1900!