M 4.3 in United States on 23 Nov 2020 22:19 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: 4.3M
Depth: 24.4 Km
Lat/Lon: 56.7351 , -135.9307
Event Date: 23 Nov 2020 22:19 UTC
23 Nov 2020 13:19 Local
Exposed Population: About 8000 people within 100km
Source: ALASKA EC ak020f2thkhg
Inserted at: 23 Nov 2020 22:35 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
ALASKA EC 0 0
ak020f2thkhg 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.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1344637 0 23 Nov 2020 22:19 4.5M, 1.1km 2.53 N/A (in MMI>=VII) 00:13 ALASKA EC
1344638 0 23 Nov 2020 22:19 4.3M, 24.4km 3.46 N/A (in MMI>=VII) 00:15 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) . The nearest places are Goddard, Mount Edgecombe, and Sitka.

Radius Population
100 km 8600 people
75 km 8500 people
50 km 1300 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
British Columbia Canada 3.4 million people
Yukon Territory Canada 29000 people

Affected populated places

Name Region Province Country City class Population Distance
Goddard Alaska United States Village - 37 km
Mount Edgecombe Alaska United States Village - 50 km
Sitka Alaska United States City 8900 people 52 km

see full list

Critical infrastructure

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

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Sitka SIT 6 Civ. Paved Yes 6500 49 km
Hidden Falls HDA unknown 0 69 km
Warm Spring Bay BNF unknown 0 78 km
Little Port Walter LPW unknown 0 78 km
Port Walter PWR unknown 0 88 km
Port Armstrong PTL unknown 0 92 km
Port Alexander unknown 0 96 km
False Island FAK unknown 0 99 km

Ports

Name LOCODE Country Distance
Sitka Wake Island 51 km
Big Port Walter Wake Island 84 km
Little Port Walter Wake Island 89 km
Port Armstrong Wake Island 92 km
Port Conclusion Wake Island 94 km
Todd Wake Island 97 km
Washington Bay Wake Island 97 km

Dams

Reservoir Dam Name River Year Distance
Green Lake Vodopad River 1982 58 km
Blue Lake Sawmill Creek 1961 58 km

More information

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