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Strong mag. 5.3 earthquake - 148 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 12:32 pm (GMT -8) -

This quake was likely an aftershock of the 8.2 quake Chignik Earthquake, Gulf of Alaska, July 29, 2021 06:15 GMT, which had occurred 14 hours earlier.
Strong mag. 5.3 earthquake - 148 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 12:32 pm (GMT -8) Strong mag. 5.3 earthquake - 148 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 12:32 pm (GMT -8)

Strong magnitude 5.3 earthquake at 10 km depth

29 Jul 20:41 UTC: First to report: USGS after 9 minutes.
29 Jul 20:44: Hypocenter depth recalculated from 44.9 to 12.9 km (from 28 to 8 mi). Epicenter location corrected by 1 km (0.6 mi) towards SSE.
29 Jul 20:46: Hypocenter depth recalculated from 12.9 to 8.1 km (from 8 to 5 mi).
29 Jul 20:51: Magnitude recalculated from 5.5 to 5.3. Hypocenter depth recalculated from 8.1 to 10.1 km (from 5 to 6.3 mi). Epicenter location corrected by 12 km (7.4 mi) towards SE.

Earthquake details

Date & timeJul 29, 2021 20:32:42 UTC -
Local time at epicenter29 Jul 12:32 pm (GMT -8)
Depth10.1 km
Epicenter latitude / longitude55.1996°N / 156.7552°W (Gulf of Alaska, Alaska, United States)
Antipode55.2°S / 23.245°E
Shaking intensityModerate shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoVeniaminof (184 km / 114 mi)
Nearby towns and cities166 km (103 mi) SE of Chignik Lagoon (pop: 78) | Show on map | Quakes nearby
170 km (106 mi) ESE of Perryville (pop: 113) | Show on map | Quakes nearby
172 km (107 mi) SE of Chignik Lake (pop: 73) | Show on map | Quakes nearby
226 km (141 mi) SSE of Port Heiden (pop: 98) | Show on map | Quakes nearby
238 km (148 mi) E of Sand Point (pop: 1,060) | Show on map | Quakes nearby
354 km (220 mi) E of King Cove (pop: 1,010) | Show on map | Quakes nearby
373 km (232 mi) SW of Womens Bay (pop: 719) | Show on map | Quakes nearby
383 km (238 mi) SW of Kodiak Station (pop: 1,300) | Show on map | Quakes nearby
393 km (244 mi) SW of Kodiak (pop: 6,250) | Show on map | Quakes nearby
393 km (244 mi) SW of Saint Paul (pop: 6,250) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 12.1°C (54 F), humidity: 87%, wind: 6 m/s (12 kts) from S
Estimated seismic energy released5.6 x 1012 joules (1.56 gigawatt hours, equivalent to 1344 tons of TNT) | about seismic energy
Show interactive Map
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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.
5.310.1 km159 Km SE of Chignik, AlaskaUSGS
5.530 kmAlaska PeninsulaGFZ
5.510 kmNear AnchorageRENASS
5.525 kmAlaska PeninsulaGeoAu
5.711 kmSouth of AlaskaBMKG


Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 1181 km / 734 mi | Show on map | Station Info
Seismic station College Outpost, Alaska, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Fairbanks (1181.2 km NNE of epicenter) [Map] / not felt (reported through our app)

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