Overall Green Earthquake in United States on 20 Mar 2025 04:28 UTC

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

M 5.6 in United States on 20 Mar 2025 04:28 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:	5.6M
Depth:	35 Km
Lat/Lon:	51.0516 , -176.0595
Event Date:	20 Mar 2025 04:28 UTC 19 Mar 2025 16:28 Local
Exposed Population:	Few people affected in MMI&>=III
Source:	NEIC us6000pzwb
Inserted at:	20 Mar 2025 04:45 UTC
INFORM Coping capacity of the alert score:	1.1 (United States)

GDACS Score

For more info on GDACS score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us6000pzwb	Scaled population (raster)	0
	C1 shakemap	0
	C2 shakemap	0
	Country Vulnerability	0
	INFORM_normalised	0
	Score no CC	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	Level	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1628843		0	20 Mar 2025 04:28	5.5M, 18km	3.53	Few people (in 100km)		00:06	NTWC
1628848		0	20 Mar 2025 04:28	5.6M, 35km	3.58	N/A (in MMI>=VII)		00:16	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

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1628848	-176.06/51.052	5.6	35	3.71	20 Mar 2025 04:53	00:24	(new episode)
2	1628848	-176.06/51.052	5.6	35	3.685	20 Mar 2025 05:00	00:31	(upd of #1)
3	1628848	-176.06/51.052	5.6	35	3.705	20 Mar 2025 06:39	02:10	(upd of #2)
4	1628848	-176.06/51.052	5.6	35	3.705	20 Mar 2025 06:55	02:26	(upd of #3)
5	1628848	-176.06/51.052	5.6	35	3.685	21 Mar 2025 14:00	1d 09:32	(upd of #4)

Affected Provinces

Region Province	Country	Population
Alaska	United States	<1000 people
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	97 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	101 km

Ports

Intensity	Name	LOCODE	Country	Distance
	Adak		Wake Island	98 km

More information

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

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
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