M 5.5 in Fox Islands, Aleutian Islands on 21 Nov 2022 15:09 UTC
Shakemap
Tsunami

Event summary

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

Earthquake Magnitude: 5.5M
Depth: 19.404 Km
Lat/Lon: 52.3403 , -168.1985
Event Date: 21 Nov 2022 15:09 UTC
21 Nov 2022 04:09 Local
Exposed Population: Less then 100 people in MMI X
Few people affected in MMI -
Source: NEIC us7000irbb
Inserted at: 21 Nov 2022 17:22 UTC
INFORM Coping capacity of the alert score: 1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)
GDACS score
NEIC 0 0
us7000irbb Scaled population (raster) 0  
  C1 shakemap 0  
  C2 shakemap 0  
  Country Vulnerability 0  
  INFORM_normalised 0  
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
1474408 0 21 Nov 2022 15:09 5.4M, 17km 3.08 less than 100 (in MMI>=VII) 00:05 NTWC
1474413 0 21 Nov 2022 15:09 5M, 25.2km 3.13 less than 100 (in MMI>=VII) 00:15 ALASKA EC
1474414 0 21 Nov 2022 15:09 5.5M, 13.412km 3.55 Few people (in 100km) 00:21 NEIC
1474415 0 21 Nov 2022 15:09 5.5M, 1km 3.33 less than 100 (in MMI>=VII) 00:21 ALASKA EC
1474416 0 21 Nov 2022 15:09 5.5M, 21.526km 3.47 less than 100 (in MMI>=VII) 00:26 NEIC
1474433 0 21 Nov 2022 15:09 5.5M, 19.404km 3.41 less than 100 (in MMI>=VII) 02:13 NEIC
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 (population 572,432) . The alertlevel for this event is GREEN

Intensity Population
no people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1474415 52.523/-168.294 5.0 24.5 3.08 21 Nov 2022 15:18 00:08 (new episode)
2 0 1474416 52.379/-168.222 5.5 13.4 3.408 21 Nov 2022 15:36 00:26 (new episode)
3 0 1474416 52.358/-168.199 5.5 21.5 3.47 21 Nov 2022 15:45 00:35 (upd of #2)
4 0 1474433 52.358/-168.199 5.5 21.5 3.47 21 Nov 2022 17:16 02:07 (new episode)
5 0 1474433 52.34/-168.198 5.5 19.4 3.451 21 Nov 2022 17:28 02:19 (upd of #4)
6 0 1474433 52.354/-168.207 5.5 13.9 3.399 21 Nov 2022 21:49 06:40 (upd of #5)
7 0 1474433 52.354/-168.207 5.5 13.9 3.399 22 Nov 2022 15:40 1d 00:30 (upd of #6)
8 0 1474433 -168.19/52.334 5.5 16.1 3.41 29 Nov 2022 00:50 7d 09:41 (upd of #7)

Affected Provinces

Intensity Region Province Country Population
Alaska United States <1000 people
Alaska United States <1000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Unalaska Alaska United States Village 4300 people 203 km
Biorka Alaska United States Village - 212 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
Nikolski AS IKO 22 0 80 km

Ports

Intensity Name LOCODE Country Distance
Unalaska USUAA Wake Island 204 km

More information

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