Overall Green Earthquake alert in United States from 08 Apr 2023 20:25 UTC to 20:25

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 4.9 in United States from 08 Apr 2023 20:25 UTC to 20:25

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:	4.9M
Depth:	36.1 Km
Lat/Lon:	53.7193 , -165.2776
Event Date:	08 Apr 2023 20:25 UTC 08 Apr 2023 09:25 Local
Exposed Population:	6 thousand in MMI III
Source:	ALASKA EC ak0234ieq2c8
Inserted at:	08 Apr 2023 20:39 UTC
INFORM Coping capacity of the alert score	1.1 (United States)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Rapid Impact)		GDACS score
ALASKA EC	0		0
ak0234ieq2c8	Scaled population (vector)	0
	C1 rapid impact	0
	C2 rapid impact	0
	Country Vulnerability	0
	INFORM_normalised	0

Maximum expected impact using different data sources.

Episode Timeline

ID	Date	Mag, Depth	MMI*	Population**	Delay (hh:mm)	Source
1499618	08 Apr 2023 20:25	5M, 60km	3.63	N/A (in MMI>=VII)	00:08	NTWC
1499621	08 Apr 2023 20:25	4.9M, 36.1km	3.03	6 thousand (in 100km)	00:13	ALASKA EC
1499623	08 Apr 2023 20:25	5.1M, 66.396km	3.6	N/A (in MMI>=VII)	00:16	NEIC
1500442	08 Apr 2023 20:25	5.1M, 56.2km	3.75	3 thousand (in 100km)	5d 05:42	ALASKA EC
1500562	08 Apr 2023 20:25	5.1M, 65.5km	3.66	N/A (in MMI>=VII)	6d 01:39	ALASKA EC

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	5500 people
75 km	1100 people
50 km	no people
20 km	no people
10 km	no people
5 km	no people
2 km	no people

Affected Provinces

Affected populated places

Name	Region Province	Country	City class	Population	Distance
Akutan	Alaska	United States	Village	<1000 people	57 km
Biorka	Alaska	United States	Village	-	62 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
Akutan	KQA	unknown				0	57 km
Lost Harbor Sea Port	LHB	unknown				0	61 km
Beaver Inlet Sea Port	BVD	unknown				0	69 km
Unalaska - Emergency Field	DUT	7	Civ.	Paved	Yes	3900	86 km
Cape Sarichef	CSH	89	Civ.	Unpaved	No	3500	99 km

Ports

Name	LOCODE	Country	Distance
Akutan	USAKU	Wake Island	57 km
Unalaska	USUAA	Wake Island	84 km
Dutch Harbor	USDUT	Wake Island	86 km
Cannery Bay		Wake Island	97 km
Unimak		Wake Island	99 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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