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

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.

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 off shore.

Radius	Population
100 km	no 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

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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