Major mag. 7.8 earthquake - 105 km SSE of Perryville, Alaska (USA) on Wednesday, 22 July 2020 - information

Update Wed 22 Jul 2020 06:35
Tsunami warning:
National Tsunami Warning Center issued a tsunami alert.
Tsunami Warning in Effect for: * SOUTH ALASKA AND THE ALASKA PENINSULA, Pacific coasts from

Kennedy Entrance, Alaska (40 miles SW of Homer) to Unimak
Pass, Alaska (80 miles NE of Unalaska)

For current updates, check www.tsunami.gov

Major magnitude 7.8 earthquake - Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East, Alaska, USA, on Wednesday, July 22, 2020 at 06:12 (GMT)

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Major magnitude 7.8 earthquake - Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East, Alaska, USA, on Wednesday, July 22, 2020 at 06:12 (GMT)

Major magnitude 7.8 earthquake at 28 km depth

22 Jul 06:21 UTC: First to report: USGS after 8 minutes.
Jul 22 06:30: Magnitude recalculated from 7.4 to 7.8.
Hypocenter depth recalculated from 13.0 to 10.0 km.
Hypocenter depth recalculated from 10.0 to 28.0 km.
Date & time: Jul 22, 2020 06:12:44 UTC -
Magnitude: 7.8
Depth: 28.0 km
Epicenter latitude / longitude: 55.0298°N / 158.5217°W (Gulf of Alaska, Alaska, United States)
Antipode: 55.03°S / 21.478°E
Nearest volcano: Kupreanof (116 km / 72 mi)
Nearby towns and cities:
106 km (66 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
130 km (81 mi) ESE of Sandpoint (pop: 1,060) --> See nearby quakes!
137 km (85 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
142 km (88 mi) S of Chignik Lagoon (pop: 78) --> See nearby quakes!
213 km (132 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
242 km (150 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
268 km (166 mi) E of Cold Bay (pop: 123) --> See nearby quakes!
446 km (277 mi) S of Dillingham (pop: 2,400) --> See nearby quakes!
475 km (295 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
485 km (302 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.2 x 1016 joules (8784 gigawatt hours, equivalent to 7.6 x 106 tons of TNT or 472.4 atomic bombs!) 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.
Mag.DepthLocationSource
7.828 km105 km SSE of Perryville, Alaska (USA)USGS
7.830 kmAlaska Peninsula (USA)GFZ
7.830 kmAlaska Peninsula (USA)EMSC
7.822 kmAlaska Peninsula (USA)GeoAu
7.720 kmAlaska Peninsula, United States [Sea: United States] (USA)INGV
7.626 kmAlaska Peninsula (USA)BMKG

User reports for this quake (56)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Alaska (48.4 km WSW of epicenter) [Map] / Severe shaking (MMI VIII) : I thought the world was going under At first it started to shake a little bit which made us stronger, we ran out and the electricity went out and some old houses fell a few minutes later the electricity went on again and I got a tsunami warning right away | 2 users found this interesting.  
Southwest Anchorage, AK (846 km NNE of epicenter) [Map] / not felt : I was watching the local news when I would have felt shaking from this earthquake. My mom rushed to my room to | 2 users found this interesting.  
Chignik Bay (141 km N of epicenter) [Map] / Very strong shaking (MMI VII) : A lot of items fell off the shelves. No damage to buildings. Slight tidal rise and fall. Still feeling aftershocks the second day. | One user found this interesting.  
Naknek, AK (422.9 km NNE of epicenter) [Map] / Weak shaking (MMI III) : Working down at the dock and felt the conveyor belt tables shake, we looked above and the light fixtures and hanging outlets were swinging. Out supervisors evacuated us all until it was safe to return | One user found this interesting.  
Alaska (94 km SE of epicenter) [Map] / Severe shaking (MMI VIII) : I thought the world was going to end | One user found this interesting.  
South Pasadena Ca / not felt : I live in an A frame wood house - hard to describe but the house made this crackling noise that seemed to roll through the entire house. Now I'm wondering if that's why my dog was panting in the dark. | One user found this interesting.  
Hayward, Alameda, California (3340.1 km ESE of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Milwaukee, Wisconsin (5084.3 km ENE of epicenter) [Map] / Violent shaking (MMI IX) (reported through our app)
Lents, Multnomah, Oregon (2728.1 km E of epicenter) [Map] / Very weak shaking (MMI II) : My dogs woke me up....I don't know if it was the quake but it was the same time (reported through our app)  
St. Lawrence island (1221 km NNW of epicenter) [Map] / not felt (reported through our app)
Buellton CA (3707.4 km ESE of epicenter) [Map] / Weak shaking (MMI III) : Swaying feeling (reported through our app)  
Point hope (1540 km NNW of epicenter) [Map] / Weak shaking (MMI III) : Very light shake.. (reported through our app)  
China Lake Acres, Kern, California (3765.3 km ESE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
King Salmon, Alaska (404.2 km N of epicenter) [Map] / Weak shaking (MMI III)
King Salmon, Bristol Bay County, Alaska (426.5 km NNE of epicenter) [Map] / Moderate shaking (MMI V)
Phelan (3881.8 km ESE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Eagle River, Anchorage, Alaska (874.4 km NNE of epicenter) [Map] / not felt (reported through our app)
Homer (662.4 km NE of epicenter) [Map] / Light shaking (MMI IV) : Light shaker long time (reported through our app)  
Kenai, Alaska (748.9 km NNE of epicenter) [Map] / Very weak shaking (MMI II) : Grandfather clock started rattling. (reported through our app)  
Canoga Park, Los Angeles, California (3836.6 km ESE of epicenter) [Map] / Strong shaking (MMI VI) (reported through our app)
Sandy, People's Republic of Utah / not felt : Not my fault. | One user found this interesting.  
North Vancouver, BC., Canada / Weak shaking (MMI III) : Brief sensation of tingling in feet and lower legs, lasted about 1 minute. Reminiscent of a very large truck parking too close to building effecting the room I was in. Vibration moved east to west through livingroom. Strong enough and long enough for me t  
South Pasadena Ca / not felt : I live in an A frame wood house - hard to describe but the house made this crackling noise that seemed to roll through the entire house. Now I'm wondering if that's why my dog was panting in the dark.  
Oscarville , about 5 miles from Bethel / Weak shaking (MMI III) : The house shook for a good minute. The hanging decorations swayed. The water in the pitcher sloshed around.  
Chignik Lagoon / Very strong shaking (MMI VII) : Lasted a long time. Probably over one minute. Lots of items fell to the floor. Three small aftershocks with in 15 minutes.  
South Amchorage / Weak shaking (MMI III) : Got the emergency tsunami alert and was startled cause I hadn't felt anything. When I looked up, my chandelier was swinging a very wide swing and didnt stop swimimg for 19 minutes.  
King Salmon, AK / Weak shaking (MMI III) : My wife felt it. The open door moved back and forth maybe 1 inch. The towels swayed a little-less than 1 inch.  
placerville CA / Very weak shaking (MMI II)
Togiak, AK / Very weak shaking (MMI II) : Felt light shaking.  
placerville CA / Very weak shaking (MMI II)
Akutan, Ak / Moderate shaking (MMI V) : Long for a minute approximately, started slow progressively getting more aggressive.  
Los Ángeles / Weak shaking (MMI III) : It was in the middle of the night and I felt of shaking  
Los Ángeles / Weak shaking (MMI III) : It was in the middle of the night and I felt of shaking  
Los Ángeles / Weak shaking (MMI III) : It was in the middle of the night and I felt of shaking  
Chignik Lake / Strong shaking (MMI VI)
Perryville / Very strong shaking (MMI VII) : very strong shaking pictures knocked off walls standing glasses tipped over  
Tuolumne California / Light shaking (MMI IV) : Lots of light shaking last few here  
Naknek / Light shaking (MMI IV)
Naknek AK / Very weak shaking (MMI II) : On bottom floor in Naknek felt the bed shake, curtains and wall hanging a were shaking.  
homer, alaska / Light shaking (MMI IV)
Anchorage / not felt
Port Moller ak / Very strong shaking (MMI VII) : Definitely felt this one  
Bethel, AK / not felt : Didn’t feel it but hanging light swayed for about 2-5 mins.  
Bellevu, WA / not felt : Bowl in cabinet shifted  
Igiugig / Moderate shaking (MMI V)
Anchor point, AK / not felt : Received a tsunami warning alert  
King Salmon / Light shaking (MMI IV) : Everything in my house was shaking  
King Salmon, Ak / Moderate shaking (MMI V) : Lasted a long time...over 1 minute. Strong shaking and swaying  
Anchorage (United States, 846 km NE of epicenter) : Didn’t feel a thing. We were awake and chilling. There was no observable movement. (reported through EMSC)  
Town and Country (United States, 2930 km E of epicenter) : Bed shuttered (reported through EMSC)  
Knik-Fairview (United States of America, 881 km NE of epicenter) : Felt nothing in Wasilla. Hope everyone is ok further south. (reported through EMSC)  
Anchorage (United States, 846 km NE of epicenter) : Felt nothing.... was on the couch... (reported through EMSC)  
Vancouver (Canada, 2481 km E of epicenter) : Felt very dizzy (reported through EMSC)  
Anchorage (United States, 848 km NE of epicenter) : The chandelier was swinging 6in both ways and swung for 19 minutes. Feels very dizzy. Shocking (reported through EMSC)  
Homer (United States, 656 km NE of epicenter) : Bed and curtains were going. Felt like a very long quake! Felt at Homer, Ak at the end of the Spit @ Lands End. (reported through EMSC)  
Naknek (United States of America, 413 km N of epicenter) : We felt it! (reported through EMSC)  
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Aftershocks

More info

Recorded aftershocks, latest first (1431 quakes)

  • 06 Oct 2021 09:01 UTC
    | M 2.9 |
    65.2 km (40.5 mi) depth
    |
    200 km (124 mi) distance
    | USGS | Details
  • 06 Oct 2021 06:42 UTC
    | M 4.4 |
    10 km (6.2 mi) depth
    |
    368 km (229 mi) distance
    | USGS | Details
  • 06 Oct 2021 06:33 UTC
    | M 2.4 |
    39.9 km (24.8 mi) depth
    |
    452 km (281 mi) distance
    | USGS | Details
  • 06 Oct 2021 05:21 UTC
    | M 4.3 |
    10 km (6.2 mi) depth
    |
    367 km (228 mi) distance
    | USGS | Details
  • 06 Oct 2021 05:13 UTC
    | M 2.3 |
    32.1 km (19.9 mi) depth
    |
    256 km (159 mi) distance
    | USGS | Details
  • 06 Oct 2021 03:42 UTC
    | M 4.5 |
    11.7 km (7.3 mi) depth
    |
    366 km (227 mi) distance
    | USGS | Details
  • 05 Oct 2021 04:26 UTC
    | M 3.4 |
    129.7 km (80.6 mi) depth
    |
    454 km (282 mi) distance
    | USGS | Details
  • 04 Oct 2021 14:51 UTC
    | M 3.1 |
    45.1 km (28 mi) depth
    |
    115 km (72 mi) distance
    | USGS | Details
  • 04 Oct 2021 11:06 UTC
    | M 3.3 |
    67.6 km (42 mi) depth
    |
    249 km (155 mi) distance
    | USGS | Details
  • 01 Oct 2021 14:12 UTC
    | M 4.7 |
    45.2 km (28.1 mi) depth
    |
    169 km (105 mi) distance
    | USGS | Details
  • 30 Sep 2021 23:59 UTC
    | M 2.2 |
    13.5 km (8.4 mi) depth
    |
    418 km (260 mi) distance
    | USGS | Details
  • 30 Sep 2021 11:25 UTC
    | M 3.5 |
    8.7 km (5.4 mi) depth
    |
    422 km (262 mi) distance
    | USGS | Details
  • 30 Sep 2021 10:53 UTC
    | M 3.4 |
    27.9 km (17.3 mi) depth
    |
    105 km (65 mi) distance
    | USGS | Details
  • 29 Sep 2021 07:02 UTC
    | M 2.1 |
    0 km (0 mi) depth
    |
    276 km (172 mi) distance
    | USGS | Details
  • 29 Sep 2021 00:44 UTC
    | M 2.0 |
    5.6 km (3.5 mi) depth
    |
    303 km (188 mi) distance
    | USGS | Details
  • 28 Sep 2021 09:52 UTC
    | M 2.7 |
    139 km (86.4 mi) depth
    |
    210 km (131 mi) distance
    | USGS | Details
  • Show all

Earlier earthquakes in the same area

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