M 7.4 Earthquake and Tsunami (1.3 m) in United States from 22 Jul 2020 06:12 UTC to 06:12

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: 7.4M
Depth: 13 Km
Lat/Lon: 55.22 , -158.594
Event Date: 22 Jul 2020 06:12 UTC
21 Jul 2020 19:12 Local
Exposed Population: Few people within 100km
Source: NTWC at00qdux98
Inserted at: 22 Jul 2020 06:21 UTC
INFORM Coping capacity of the alert score: 2.2 (United States)


For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
NTWC 0 1.1 1.1
at00qdux98 Scaled population (vector) 0.76 Max wave alert 1.26m  
  C1 earthquake 1 Max wave realtime 1.26m  
  C2 earthquake 0      
  Country Vulnerability 0      
  INFORM_normalised 0.65      
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1322921 1.1 22 Jul 2020 06:12 7.4M, 13km N/A Few people (in 100km) 1.3m (at 00:46) 00:08 NTWC
1322927 1.3 22 Jul 2020 06:12 7.8M, 10km N/A Few people (in 100km) 1.6m (at 00:56) 00:33 NEIC
1322939 0.9 22 Jul 2020 06:12 7.8M, 28km 7.15 less than 100 (in MMI>=VII) 0.9m (at 00:54) 01:17 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 , State of Alaska (population 572,432) .

Radius Population
100 km <1000 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 IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Perryville 7 0 84 km
Ivanof Bay KIB unknown 0 94 km


Name LOCODE Country Distance
Perryville USPYX Wake Island 84 km
Ivanof Bay Wake Island 85 km

More information

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