M 5.6 in United States on 31 Oct 2021 16:37 UTC

Hazard models

EQ parameters
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: 5.6M
Depth: 25 Km
Lat/Lon: 54.9255 , -158.7303
Event Date: 31 Oct 2021 16:37 UTC
31 Oct 2021 05:37 Local
Exposed Population: No people affected in 100km
Source: NEIC us7000fqai
Inserted at: 08 Nov 2021 07:03 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)		 GDACS score
NEIC 0 0
us7000fqai Scaled population (raster) 0  
  C1 shakemap -0.59  
  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
1406002 0 31 Oct 2021 16:37 5.2M, 42km 3.87 N/A (in MMI>=VII) 00:07 NTWC
1406007 0 31 Oct 2021 16:37 5.6M, 31.83km 4.46 N/A (in MMI>=VII) 00:16 NEIC
1406008 0 31 Oct 2021 16:37 5.6M, 21.08km 4.1 N/A (in MMI>=VII) 00:35 NEIC
1406990 0 31 Oct 2021 16:37 5.6M, 25km 4.22 N/A (in MMI>=VII) 7d 14:26 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. 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 1406007 54.934/-158.686 5.7 7.1 3.867 31 Oct 2021 16:50 00:13 (new episode)
2 0 1406008 54.947/-158.753 5.6 31.8 4.461 31 Oct 2021 16:58 00:20 (new episode)
3 0 1406008 54.909/-158.672 5.6 21.1 4.539 31 Oct 2021 18:00 01:22 (upd of #2)
4 0 1406008 54.909/-158.672 5.6 21.1 4.539 31 Oct 2021 18:43 02:05 (upd of #3)
5 0 1406008 54.909/-158.672 5.6 21.1 4.097 01 Nov 2021 16:41 1d 00:03 (upd of #4)
6 0 1406990 54.926/-158.73 5.6 25.0 4.219 04 Nov 2021 22:16 4d 05:38 (new episode)

Affected Provinces

Intensity Region Province Country Population
Alaska United States no people


Critical infrastructure

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

More information

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