M 7.8 in United States on 22 Jul 2020 06:12 UTC

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: 7.8M
Depth: 28 Km
Lat/Lon: 55.0298 , -158.5217
Event Date: 22 Jul 2020 06:12 UTC
21 Jul 2020 19:12 Local
Exposed Population: About 1000 people in MMI VI
No people within 100km
Source: NEIC us7000asvb
Inserted at: 22 Jul 2020 07:29 UTC
INFORM Coping capacity of the alert score: 2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
NEIC 0 0.9 0.9
us7000asvb Scaled population (raster) 0 Max wave alert 0.92m  
  C1 earthquake 1 Max wave realtime 0.92m  
  C2 earthquake 0      
  Country Vulnerability 0      
  INFORM_normalised 1      
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
1322921 1.1 22 Jul 2020 06:12 7.4M, 13km N/A Few people 1.3m (at 00:46) 00:08 NTWC
1322927 1.3 22 Jul 2020 06:12 7.8M, 10km N/A Few people 1.6m (at 00:56) 00:33 NEIC
1322939 0.9 22 Jul 2020 06:12 7.8M, 28km 7.15 No people affected 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 ,of Alaska (population 572,432) . The alertlevel for this event is GREEN

Intensity Population
1300 people
<1000 people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
2 0 1322939 54.883/-158.418 6.92 22.9839 6.34 22 Jul 2020 07:46 01:33 (new episode)
4 0 1322939 55.03/-158.522 7.8 28.0 6.864 22 Jul 2020 08:59 02:46 (upd of #2)
5 0 1322939 55.03/-158.522 7.8 28.0 7.148 22 Jul 2020 17:24 11:11 (upd of #4)

Affected Provinces

Intensity Region Province Country Population
Alaska United States no people
Alaska United States <1000 people
Alaska United States 1500 people
Alaska United States <1000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Mitrofania Alaska United States Village - 107 km
Village Alaska United States Village - 117 km
Unga Alaska United States Village - 128 km
Squaw Harbor Alaska United States Village - 131 km
Herendeen Bay Alaska United States Village - 160 km
Port Moller Alaska United States Village - 168 km
Bear River Alaska United States Village - 175 km
Ilnik Alaska United States Village - 188 km
Meshik Alaska United States Village - 210 km
Belkofski Alaska United States Village - 225 km
Pauloff Harbor Alaska United States Village - 277 km
Sanak Alaska United States Village - 282 km
Morzhovoi Alaska United States Village - 307 km
Ikatan Alaska United States Village - 309 km
Kanatak Alaska United States Village - 321 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)
Perryville 7 0
Ivanof Bay KIB unknown 0
Sand Point SDP 6 Civ. Paved Yes 4000
Squaw Harbor unknown 0
Chignik Lake 15 0
Chignik Bay KBW unknown 0
Chignik Lagoon KCL 15 0
Chignik Fisheries KCG 8 0
Johnsons Landing 40 0
Port Moller PML unknown 0
Herendeen Bay 6 0
Nelson Lagoon NLG 4 0
Port Heiden PTH 29 Civ. Unpaved Yes 6200
King Cove KVC 47 0
Cold Bay CDB 30 Civ. Paved Yes 10400
Blinn Lake 15 0
Pauloff Harbor KPH unknown 0
Ugashik Bay UGB 40 0
Ugashik/new UGS 8 0
Pilot Point PIP 17 0
Big Creek BIC unknown 0
False Pass KFP 6 0
Sitkinak SKJ unknown 0
Fort Jensen 73 0
Bear Creek BCC unknown 0
Alitak ALZ unknown 0

Ports

Intensity Name LOCODE Country
Ivanof Bay Wake Island
Perryville USPYX Wake Island
Unga Wake Island
Baralof Bay Wake Island
Sand Point Wake Island
Chignik Wake Island
Port Moller Wake Island
Port Heiden Wake Island
Chirikof Island Wake Island
Belkofski Wake Island
King Cove Wake Island
Cold Bay Wake Island
Sanak Island Wake Island
Fort Randal Wake Island
Ugashik Wake Island
Pilot Point Wake Island
Kanatak Wake Island
Lazy Bay Wake Island

More information

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