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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 - 31 mi east of Simeonof Island, Aleutians East, Alaska, USA, on Wednesday, July 22, 2020 at 06:12 GMT

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

Earthquake details

Date & timeJul 22, 2020 06:12:44 UTC
Local time at epicenter
StatusConfirmed
Magnitude7.8
Depth28.0 km
Epicenter latitude / longitude55.0298°N / 158.5217°W (Gulf of Alaska, Alaska, United States)
Antipode55.03°S / 21.478°E
Shaking intensityVery strong shaking
Felt38 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoKupreanof (116 km / 72 mi)
Nearby towns and cities106 km (66 mi) SSE of Perryville (pop: 113) | Show on map | Quakes nearby
130 km (81 mi) ESE of Sand Point (pop: 1,060) | Show on map | Quakes nearby
137 km (85 mi) S of Chignik Lake (pop: 73) | Show on map | Quakes nearby
142 km (88 mi) S of Chignik Lagoon (pop: 78) | Show on map | Quakes nearby
201 km (125 mi) ESE of Nelson Lagoon (pop: 52) | Show on map | Quakes nearby
213 km (132 mi) S of Port Heiden (pop: 98) | Show on map | Quakes nearby
242 km (150 mi) E of King Cove (pop: 1,010) | Show on map | Quakes nearby
268 km (166 mi) E of Cold Bay (pop: 123) | Show on map | Quakes nearby
475 km (295 mi) SW of Kodiak Station (pop: 1,300) | Show on map | Quakes nearby
485 km (302 mi) SW of Kodiak (pop: 6,250) | Show on map | Quakes nearby
Estimated seismic energy released3.2 x 1016 joules (8784 gigawatt hours, equivalent to 7.6 x 106 tons of TNT or 472.4 atomic bombs!) | about seismic energy
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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

Seismograms

Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 1241 km / 771 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 (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 | 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 f  
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.  
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Aftershocks

Please check again later while we are collecting more data.

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