M 5.6 in United States on 16 Sep 2021 17:51 UTC
EQ parameters

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: 5.6M
Depth: 1.2 Km
Lat/Lon: 55.2336 , -156.6369
Event Date: 16 Sep 2021 17:51 UTC
16 Sep 2021 07:51 Local
Exposed Population: No people affected in 100km
Source: ALASKA EC ak021bwmmasc
Inserted at: 16 Sep 2021 18:04 UTC
INFORM Coping capacity of the alert score
2.2 (United States)


For more info on GDACS alert score click here.
  Earthquake GDACS score
ak021bwmmasc Scaled population (vector) 0  
  C1 earthquake 1  
  C2 earthquake 0  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1397044 0 16 Sep 2021 17:51 5.6M, 1.2km N/A No people affected (in 100km) 00:12 ALASKA EC
1397045 0 16 Sep 2021 17:51 5.6M, 5km 3.32 N/A (in MMI>=VII) 00:14 ALASKA EC
1397047 0 16 Sep 2021 17:51 5.6M, 36.5km 3.24 N/A (in MMI>=VII) 00:20 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 , State of Alaska (population 572,432) .

Radius Population
100 km no people
75 km no people
50 km no people
20 km no people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
Alaska United States 570000 people

Critical infrastructure

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


Name LOCODE Country Distance
Chirikof Island Wake Island 100 km

More information

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