Overall Green Earthquake alert in United States on 21 Sep 2023 01:13 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 5.4 in United States on 21 Sep 2023 01:13 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:	5.4M
Depth:	50.6 Km
Lat/Lon:	54.9711 , -160.3721
Event Date:	21 Sep 2023 01:13 UTC 20 Sep 2023 17:13 Local
Exposed Population:	Few people affected in MMI&>=III
Source:	NEIC us7000kx0x
Inserted at:	21 Sep 2023 01:31 UTC
INFORM Coping capacity of the alert score:	2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us7000kx0x	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

ID	Date	Mag, Depth	MMI*	Population**	Delay (hh:mm)	Source
1526442	21 Sep 2023 01:14	5.4M, 32km	3.85	N/A (in MMI>=VII)	00:06	NTWC
1526445	21 Sep 2023 01:13	5.5M, 24.3km	3.83	N/A (in MMI>=VII)	00:11	ALASKA EC
1526446	21 Sep 2023 01:13	5.4M, 50.6km	3.66	N/A (in MMI>=VII)	00:17	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	1526442	-160.518/55.067	5.6	37.6	4.189	21 Sep 2023 01:19	00:05	(new episode)
2	1526445	-160.33/54.889	5.5	24.3	4.738	21 Sep 2023 01:30	00:16	(new episode)
3	1526446	-160.33/54.889	5.5	24.3	4.738	21 Sep 2023 01:33	00:19	(new episode)
4	1526446	-160.372/54.971	5.4	50.6	4.306	21 Sep 2023 01:34	00:20	(upd of #3)
5	1526446	-160.372/54.971	5.4	50.6	4.306	21 Sep 2023 01:49	00:35	(upd of #4)
6	1526446	-160.372/54.971	5.4	50.6	4.306	21 Sep 2023 03:19	02:05	(upd of #5)
7	1526446	-160.372/54.971	5.4	50.6	4.306	22 Sep 2023 01:40	1d 00:26	(upd of #6)
8	1526446	-160.324/54.893	5.4	38	3.895	07 Oct 2023 23:52	16d 22:38	(upd of #7)

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

Name	Region Province	Country	City class	Population	Distance
Unga	Alaska	United States	Village	-	25 km
Squaw Harbor	Alaska	United States	Village	-	33 km
Village	Alaska	United States	Village	-	50 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
Squaw Harbor		unknown				0	31 km
Sand Point	SDP	6	Civ.	Paved	Yes	4000	40 km
Herendeen Bay		6				0	98 km
Ivanof Bay	KIB	unknown				0	118 km
Nelson Lagoon	NLG	4				0	126 km

Ports

Name	Country	Distance
Unga	Wake Island	25 km
Baralof Bay	Wake Island	31 km
Sand Point	Wake Island	42 km
Belkofski	Wake Island	107 km
Ivanof Bay	Wake Island	110 km
Chignik	Wake Island	193 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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