Overall Green Earthquake alert in United States on 21 Dec 2023 14:55 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

M 6.3 in United States on 21 Dec 2023 14:55 UTC

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:	6.3M
Depth:	33.2 Km
Lat/Lon:	51.3344 , -175.3583
Event Date:	21 Dec 2023 14:55 UTC 21 Dec 2023 02:55 Local
Exposed Population:	Few people affected in MMI -
Source:	NEIC usd0010b4f
Inserted at:	21 Dec 2023 15:12 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)		Tsunami		GDACS score
NEIC	0		0		0
usd0010b4f	Scaled population (raster)	0	Max wave alert	0m
	C1 shakemap	0	Max wave realtime	0m
	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

ID	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1543527	21 Dec 2023 14:55	6M, 1km	3.59	N/A (in MMI>=VII)		00:07	NTWC
1543529	21 Dec 2023 14:55	5.9M, 19.7km	3.63	Few people (in 100km)		00:14	ALASKA EC
1543530	21 Dec 2023 14:55	6.3M, 33.2km	4.06	N/A (in MMI>=VII)	0m (at 00:00)	00:16	NEIC
1543535	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. The alertlevel for this event is GREEN

Intensity	Population
	no people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1543527	-175.483/51.501	6	35.3	3.867	21 Dec 2023 15:02	00:06	(new episode)
2	1543530	-175.321/51.237	5.9	19.7	3.63	21 Dec 2023 15:13	00:17	(new episode)
3	1543530	-175.358/51.334	6.3	33.2	4.29	21 Dec 2023 15:18	00:22	(upd of #2)
4	1543535	-175.356/51.327	6.1	30.1	4.09	21 Dec 2023 15:56	01:00	(new episode)
5	1543535	-175.356/51.327	6.1	30.1	4.101	21 Dec 2023 17:02	02:06	(upd of #4)
6	1543535	-175.356/51.327	6.1	30.1	4.101	22 Dec 2023 15:40	1d 00:44	(upd of #5)
7	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	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.

Disclaimer
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