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Moderate mag. 5.3 earthquake - North Pacific Ocean, 52 mi southeast of Unalaska, Aleutians West, Alaska, USA, on Sunday, Jul 31, 2022 at 4:36 pm (GMT -8) -

Moderate mag. 5.3 earthquake - North Pacific Ocean, 52 mi southeast of Unalaska, Aleutians West, Alaska, USA, on Sunday, Jul 31, 2022 at 4:36 pm (GMT -8) Moderate mag. 5.3 earthquake - North Pacific Ocean, 52 mi southeast of Unalaska, Aleutians West, Alaska, USA, on Sunday, Jul 31, 2022 at 4:36 pm (GMT -8)

Moderate magnitude 5.3 earthquake at 43 km depth

1 Aug 00:41 UTC: First to report: USGS after 5 minutes.
1 Aug 00:49: Magnitude recalculated from 5.2 to 4.9. Hypocenter depth recalculated from 30.0 to 21.2 km (from 18.6 to 13.2 mi). Epicenter location corrected by 16 km (9.8 mi) towards NW.
... [show all] ...
1 Aug 05:06: Hypocenter depth recalculated from 41.9 to 42.7 km (from 26 to 27 mi).
Update Mon, 1 Aug 2022, 00:45

Significant magnitude 5.2 quake hits 56 miles southeast of Akutan, Alaska, United States in the afternoon

5.2 quake 31 Jul 4:36 pm (GMT -8)
5.2 quake 31 Jul 4:36 pm (GMT -8)
The United States Geological Survey reported a magnitude 5.2 quake in the United States near Akutan, Aleutians East, Alaska, only 8 minutes ago. The earthquake hit in the afternoon on Sunday, July 31st, 2022, at 4:36 pm local time at a moderately shallow depth of 19 miles. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Akutan (pop. 1000) located 56 miles from the epicenter, Unalaska (pop. 4,500) 65 miles away, and Dutch Harbor (pop. 4,400) 66 miles away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake details

Date & timeAug 1, 2022 00:36:41 UTC -
Local time at epicenterSunday, Jul 31, 2022 at 4:36 pm (GMT -8)
StatusConfirmed
Magnitude5.3
Depth42.7 km
Epicenter latitude / longitude53.5677°N / 165.3605°W (North Pacific Ocean, Alaska, United States)
Antipode53.568°S / 14.64°E
Shaking intensityWeak shaking
Felt1 report
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoAkutan (75 km / 47 mi)
Nearby towns and cities69 km (43 mi) SSE of Akutan (pop: 1,040) | Show on map | Quakes nearby
84 km (52 mi) ESE of Unalaska (pop: 4,490) | Show on map | Quakes nearby
86 km (53 mi) ESE of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
191 km (119 mi) SW of False Pass (pop: 40) | Show on map | Quakes nearby
248 km (154 mi) SW of Cold Bay (pop: 123) | Show on map | Quakes nearby
258 km (160 mi) SW of King Cove (pop: 1,010) | Show on map | Quakes nearby
371 km (230 mi) WSW of Sand Point (pop: 1,060) | Show on map | Quakes nearby
503 km (312 mi) SE of Saint Paul (pop: 479) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 11.5°C (53 F), humidity: 88%, wind: 13 m/s (24 kts) from SW
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.
Mag.DepthLocationSource
5.343 km68 Km SSE of Akutan, AlaskaUSGS
5.343 kmFox Islands, Aleutian IslandsRaspberryShake
5.210 kmFox Islands, Aleutian IslandsGFZ
5.348 kmFOX ISLANDS, ALEUTIAN ISLANDSEMSC
5.110 kmNear AnchorageRENASS
5.344 kmFox Islands, Aleutian IslandsGeoAu

Seismograms

Seismic station: Adak, Aleutian Islands, Alaska (ADK/IU network) | Distance from quake: 784 km / 487 mi | Show on map | Station Info
Seismic station Adak, Aleutian Islands, Alaska: 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
Show more

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Translate
Dutch harbor (84.4 km WNW of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 30-60 s : Living room watching at movie and star filing everything was moving | 4 users found this interesting.  

Aftershocks

[More info]

Recorded aftershocks, latest first (3 quakes)

Date and timeMag
Depth
LocationDetails
Sep 7, 2022 22:24
12 weeks ago
3.6

44 km
North Pacific Ocean, 50 mi SE of Unalaska, Aleutians West, Alaska, USAMore
Sep 2, 2022 13:26
12 weeks ago
3.5

20 km
North Pacific Ocean, 48 mi SE of Akutan, Aleutians East, Alaska, USAMore
Aug 7, 2022 14:01
16 weeks ago
4.6

43 km
North Pacific Ocean, 43 mi SE of Unalaska, Aleutians West, Alaska, USAMore

Earlier earthquakes in the same area

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