M 8.2 Earthquake and Tsunami (2.6 m) in United States on 29 Jul 2021 06:15 UTC

Hazard models

EQ parameters
Shakemap
Tsunami

Event summary

This earthquake is expected to have a medium humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude: 8.2M
Depth: 32.2 Km
Lat/Lon: 55.3248 , -157.8414
Event Date: 29 Jul 2021 06:15 UTC
28 Jul 2021 19:15 Local
Exposed Population: About 1000 people in MMI
No people within 100km
Source: ALASKA EC ak0219neiszm
Inserted at: 29 Jul 2021 07:56 UTC
INFORM Coping capacity of the alert score: 2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
ALASKA EC 0.2 1.8 1.8
ak0219neiszm Scaled population (raster) 1.91 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 2.63m  
  C2 shakemap 0.53      
  Country Vulnerability 0      
  INFORM_normalised 0.65      
Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.


Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1387963 0.2 29 Jul 2021 06:15 7.2M, 35km N/A No people affected (in 100km) 0.3m (at 00:54) 00:08 ALASKA EC
1387964 0.5 29 Jul 2021 06:15 7.3M, 3.4km 5.28 N/A (in MMI>=VII) 0.5m (at 01:06) 00:19 ALASKA EC
1387970 0.6 29 Jul 2021 06:15 7.3M, 5.5km N/A No people affected (in 100km) 0.6m (at 00:54) 00:24 ALASKA EC
1387980 1.7 29 Jul 2021 06:15 8.2M, 46.66km 6.42 N/A (in MMI>=VII) 2.4m (at 00:50) 00:35 NEIC
1388004 1.8 29 Jul 2021 06:15 8.2M, 32.2km 7.55 1 thousand (in MMI>=VII) 2.6m (at 00:50) 01:40 ALASKA EC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Exposed population

The earthquake happened in United States ,of Alaska. The alertlevel for this event is GREEN

Intensity Population
1400 people
<1000 people
1900 people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1387970 55.315/-157.829 7.2 35.0 5.284 29 Jul 2021 06:26 00:10 (new episode)
2 0 1387980 55.325/-157.841 8.2 32.2 6.418 29 Jul 2021 07:07 00:51 (new episode)
3 0 1388004 55.325/-157.841 8.2 32.2 6.464 29 Jul 2021 08:24 02:09 (new episode)
4 0.2 1388004 55.452/-157.964 8.2 28.8 7.546 29 Jul 2021 16:11 09:55 (upd of #3)
5 0.2 1388004 55.452/-157.964 8.2 28.8 7.546 30 Jul 2021 06:23 1d 00:07 (upd of #4)

Affected Provinces

Intensity Region Province Country Population
Alaska United States no people
Alaska United States <1000 people
Alaska United States <1000 people
Alaska United States 1600 people
Alaska United States 19000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Mitrofania Alaska United States Village - 92 km
Village Alaska United States Village - 151 km
Unga Alaska United States Village - 170 km
Squaw Harbor Alaska United States Village - 172 km
Ilnik Alaska United States Village - 180 km
Meshik Alaska United States Village - 184 km
Herendeen Bay Alaska United States Village - 186 km
Port Moller Alaska United States Village - 187 km
Bear River Alaska United States Village - 188 km
Kanatak Alaska United States Village - 273 km
Belkofski Alaska United States Village - 268 km
Ayakulik Alaska United States Village - 292 km
Kaguyak Alaska United States Village - 305 km
Pauloff Harbor Alaska United States Village - 327 km
Uyak Alaska United States Village - 350 km
Sanak Alaska United States Village - 332 km
Nunamiut Alaska United States Village - 334 km
McCord Alaska United States Village - 352 km
Morzhovoi Alaska United States Village - 352 km
Port Hobron Alaska United States Village - 354 km
Ikatan Alaska United States Village - 355 km
Savonoski Alaska United States Village - 382 km
Port O'Brien Alaska United States Village - 386 km
Libbyville Alaska United States Village - 388 km
Ekuk Alaska United States Village - 391 km
Koggiung Alaska United States Village - 398 km
Tuklung Alaska United States Village - 399 km
Nakeen Alaska United States Village - 404 km
Nushagak Alaska United States Village - 406 km
Kvichak Alaska United States Village - 409 km
Konakanak Alaska United States Village - 411 km
Port Bailey Alaska United States Village - 413 km
Nelsonville Alaska United States Village - 413 km
Dillingham Alaska United States Village 2500 people 416 km
Wood River Alaska United States Village - 419 km
Hallersville Alaska United States Village - 419 km
Port Wakefield Alaska United States Village - 421 km
Ungalikthluk Alaska United States Village - 425 km
Afognak Alaska United States Village - 431 km
Kodiak Alaska United States City 6300 people 432 km
Kulik Lodge Alaska United States Village - 439 km
Kamishak Alaska United States Village - 475 km
Port William Alaska United States Village - 476 km
Numachuak Alaska United States Village - 478 km
Fish Village Alaska United States Village - 544 km
Williamsport Alaska United States Village - 547 km
Pile Bay Village Alaska United States Village - 549 km
Iniskin Alaska United States Village - 564 km
Portlock Alaska United States Village - 567 km

see full list


Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Perryville 7 0 105 km
Chignik Bay KBW unknown 0 114 km
Chignik Fisheries KCG 8 0 115 km
Chignik Lagoon KCL 15 0 118 km
Chignik Lake 15 0 119 km
Ivanof Bay KIB unknown 0 121 km
Sand Point SDP 6 Civ. Paved Yes 4000 170 km
Johnsons Landing 40 0 172 km
Squaw Harbor unknown 0 173 km
Port Moller PML unknown 0 187 km
Port Heiden PTH 29 Civ. Unpaved Yes 6200 188 km
Herendeen Bay 6 0 200 km
Nelson Lagoon NLG 4 0 222 km
Ugashik Bay UGB 40 0 246 km
Ugashik/new UGS 8 0 247 km
Pilot Point PIP 17 0 252 km
Sitkinak SKJ unknown 0 268 km
Big Creek BIC unknown 0 261 km
King Cove KVC 47 0 282 km
Bear Creek BCC unknown 0 283 km
Alitak ALZ unknown 0 284 km
Fort Jensen 73 0 289 km
Akhiok AKK 13 0 290 km
Moser Bay KMY unknown 0 298 km
Olga Bay KOY unknown 0 303 km
Cold Bay CDB 30 Civ. Paved Yes 10400 311 km
Blinn Lake 15 0 312 km
Egegik EGX 26 Civ. Unpaved No 3000 320 km
Bartletts 15 0 323 km
Karluk KYK 42 0 326 km
Pauloff Harbor KPH unknown 0 326 km
Karluk Lake KKL 112 0 328 km
Bartletts Bistol Bay BSZ unknown 0 328 km
Larsen Bay 23 0 343 km
Amook Bay unknown 0 345 km
Old Harbor 17 0 353 km
Zachar Bay KZB unknown 0 354 km
False Pass KFP 6 0 359 km
Raspberry Strait RSP unknown 0 366 km
Brooks Lake BKF unknown 0 378 km
Peterson'S Point PNF unknown 0 379 km
South Naknek Nr 2 WSN 40 0 379 km
West Point Village KWP unknown 0 379 km
King Salmon AKN 17 Civ. Paved Yes 8500 380 km
Lake Brooks 11 0 381 km
Tibbetts 15 0 383 km
Paf Cannery 18 0 383 km
Kizhuyak KZH unknown 0 383 km
San Juan / Uganik WSJ unknown 0 386 km
Naknek NNK unknown 0 390 km
Ekuk KKU 9 0 391 km
Uganik UGI unknown 0 392 km
Clarks Point CLP 3 0 394 km
The Queens 8 0 397 km
Koggiung 9 0 398 km
Portage Creek 42 0 399 km
Pleasant Harbor PTR unknown 0 399 km
Nakeen 15 0 404 km
Kvichak / Diamond J 8 0 409 km
Ans Hospital 30 0 412 km
Port Bailey KPY unknown 0 413 km
Manokotak 33 0 415 km
Dillingham DLG 26 Civ. Paved Yes 6400 416 km
Wood River WOD unknown 0 417 km
Shannons Pond 24 0 418 km
Port Lions ORI 16 0 419 km
Nushagak 12 0 424 km
Kodiak Municipal KDK 22 Civ. Paved Yes 7500 425 km
Levelock KLL 18 0 427 km
Kodiak / Lily Lake 40 0 434 km
Ouzinkie 17 0 437 km
Danger Bay DGB unknown 0 438 km
Kulik Lake LKK 219 0 439 km
Tripod 69 0 441 km
Twin Hills TWA 25 0 443 km
Togiak TOG 6 Civ. Unpaved Yes 4200 443 km
Aleknagik WKK 2 0 443 km
Onion Bay ONN unknown 0 445 km
Ekwok KEK 40 0 450 km
Cape Newenham Lrrs EHM 165 Civ. Unpaved No 3900 450 km
Seal Bay SYB unknown 0 455 km
New Stuyahok KNW 99 0 460 km
Igiugig IGG 26 0 460 km
Cape Sarichef CSH 89 Civ. Unpaved No 3500 460 km
Kitoi Bay KKB unknown 0 462 km
Platinum Mine 30 0 463 km
Blue Fox Bay BFB unknown 0 472 km
Big Mountain BMX 202 0 476 km
Platinum PTU 5 Civ. Unpaved Yes 3300 476 km
Port Williams KPR unknown 0 476 km
Pope Vanoy PVY unknown 0 478 km
Goodnews GNU 5 0 479 km
Golden Horn GDH unknown 0 490 km
Koliganek 82 0 491 km
Kokhanok 46 0 493 km
Golden Horn Lodge 28 0 496 km
Lost Harbor Sea Port LHB unknown 0 513 km
Tikchik Lodge 93 0 518 km
Iliamna ILI 57 Civ. Unpaved Yes 5000 523 km
Akutan KQA unknown 0 528 km
Tikchik Spb KTH unknown 0 536 km
Pedro Bay PDB 14 0 545 km
Nondalton NNL 94 0 548 km
Dog Fish Bay 3 0 565 km
Kalakaket Creek AS 487 0 571 km
English Bay KEB 8 0 572 km
Camp Point 2 0 576 km

Ports

Intensity Name LOCODE Country Distance
Perryville USPYX Wake Island 104 km
Chignik Wake Island 113 km
Ivanof Bay Wake Island 115 km
Chirikof Island Wake Island 156 km
Unga Wake Island 170 km
Baralof Bay Wake Island 171 km
Sand Point Wake Island 172 km
Port Heiden Wake Island 181 km
Port Moller Wake Island 186 km
Ugashik Wake Island 248 km
Pilot Point Wake Island 251 km
Kanatak Wake Island 273 km
Belkofski Wake Island 268 km
Lazy Bay Wake Island 284 km
King Cove Wake Island 286 km
Karluk Wake Island 293 km
Trap Point Wake Island 295 km
Cold Bay Wake Island 309 km
Egegik Wake Island 323 km
Karluk Wake Island 325 km
Fort Randal Wake Island 328 km
Larsen Bay Wake Island 342 km
Uyak Wake Island 349 km
Sanak Island Wake Island 333 km
Three Saints Bay Wake Island 335 km
Cape Constantine Wake Island 353 km
Port Hobron Wake Island 355 km
Naknek Wake Island 381 km
Port Obrien Wake Island 386 km
Ekuk Wake Island 391 km
Koggiung Wake Island 410 km
Kanakanak Wake Island 413 km
Dry Spruce Bay Wake Island 413 km
Dillingham Wake Island 415 km
Womens Bay Wake Island 422 km
Port Vita Wake Island 423 km
Kodiak Wake Island 432 km
Ouzinkie Wake Island 437 km
Unimak Wake Island 438 km
Togiak Wake Island 444 km
Cape Newenham Wake Island 454 km
Bear Island Wake Island 469 km
Port William Wake Island 476 km
Platinum Wake Island 476 km
Akutan USAKU Wake Island 529 km

Dams

Intensity Reservoir Dam Name River Year Distance
Terror Lake Terror River 1984 394 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.