M 6 in United States from 21 Dec 2023 14:55 UTC to 14:55

Hazard models

Rapid Impact
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: 6.0M
Depth: 1 Km
Lat/Lon: 51.202 , -175.443
Event Date: 21 Dec 2023 14:55 UTC
21 Dec 2023 02:55 Local
Exposed Population: Few people affected in MMI&>=III
Source: NTWC at00s60ut7
Inserted at: 21 Dec 2023 15:03 UTC
INFORM Coping capacity of the alert score: 1.1 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NTWC 0 0
at00s60ut7 Scaled population (raster) 0  
  C1 shakemap 0  
  C2 shakemap 0  
  Country Vulnerability 0  
  INFORM_normalised 0  
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
1543527 0 21 Dec 2023 14:55 6M, 1km 3.59 N/A (in MMI>=VII) 00:07 NTWC
1543529 0 21 Dec 2023 14:55 5.9M, 19.7km 3.63 Few people (in 100km) 00:14 ALASKA EC
1543530 0 21 Dec 2023 14:55 6.3M, 33.2km 4.06 N/A (in MMI>=VII) 0m (at 00:00) 00:16 NEIC
1543535 0 21 Dec 2023 14:55 6.1M, 30.1km 3.83 N/A (in MMI>=VII) 00:55 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
no people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1543527 -175.483/51.501 6 35.3 3.867 21 Dec 2023 15:02 00:06 (new episode)
2 0 1543530 -175.321/51.237 5.9 19.7 3.63 21 Dec 2023 15:13 00:17 (new episode)
3 0 1543530 -175.358/51.334 6.3 33.2 4.29 21 Dec 2023 15:18 00:22 (upd of #2)
4 0 1543535 -175.356/51.327 6.1 30.1 4.09 21 Dec 2023 15:56 01:00 (new episode)
5 0 1543535 -175.356/51.327 6.1 30.1 4.101 21 Dec 2023 17:02 02:06 (upd of #4)
6 0 1543535 -175.356/51.327 6.1 30.1 4.101 22 Dec 2023 15:40 1d 00:44 (upd of #5)
7 0 1543535 -175.321/51.257 6.1 20 3.999 14 Jan 2024 00:51 23d 09:55 (upd of #6)

Affected Provinces

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

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Adak Station Alaska United States Village 9300 people 109 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) Distance
Adak Naf ADK 5 Mil. Paved Yes 7700 112 km
Atka AKB 10 0 142 km

Ports

Intensity Name LOCODE Country Distance
Adak Wake Island 110 km
Palisades Point Wake Island 145 km

More information

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