Overall Green Earthquake in Rat Islands, Aleutian Islands on 09 May 2026 04:42 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 5.8 in Rat Islands, Aleutian Islands on 09 May 2026 04:42 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:	5.8M
Depth:	26.5 Km
Lat/Lon:	51.0818 , 179.349
Event Date:	09 May 2026 04:42 UTC 09 May 2026 16:42 Local
Exposed Population:
Source:	NEIC us6000swf4
Inserted at:	09 May 2026 04:57 UTC
INFORM Coping capacity of the alert score:	1.1 ()

GDACS Score

For more info on GDACS score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us6000swf4	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	Date	Mag, Depth	MMI*	Population**	Delay (hh:mm)	Source
1704853	09 May 2026 04:42	5.3M, 50km	3.05	N/A (in MMI>=VII)	00:09	NTWC
1704855	09 May 2026 04:42	6.1M, 16.3km	3.41	No people affected (in 100km)	00:11	ALASKA EC
1704856	09 May 2026 04:42	5.8M, 26.5km	4.62	N/A (in MMI>=VII)	00:14	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	1704853	179.207/51.041	6.1	16	4.959	09 May 2026 04:49	00:07	(new episode)
2	1704856	179.214/50.981	6.1	16.3	4.786	09 May 2026 04:59	00:17	(new episode)
3	1704856	179.214/50.981	6.1	16.3	4.786	09 May 2026 05:01	00:19	(upd of #2)
4	1704856	179.349/51.082	5.8	26.5	4.528	09 May 2026 05:02	00:20	(upd of #3)
5	1704856	179.349/51.082	5.8	26.5	4.478	09 May 2026 05:14	00:31	(upd of #4)
6	1704856	179.349/51.082	5.8	26.5	4.528	09 May 2026 07:01	02:19	(upd of #5)
7	1704856	179.349/51.082	5.8	26.5	4.478	10 May 2026 14:00	1d 09:18	(upd of #6)

Affected Provinces

Region Province	Country	Population
Alaska	United States	no people
Alaska	United States	no people
Alaska	United States	no people

Affected populated places. Areas of interest

Intensity	Name	Region Province	Country	City class	Population	Distance

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
	Amchitka Island	AHT	69				0	34 km

Ports

Name	Country	Distance
Constantine Harbour	Wake Island	35 km
Amchitka Island	Wake Island	53 km
Semisopochroi	Wake Island	100 km

More information

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

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