Overall Green Earthquake alert in United States on 21 May 2023 18:44 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 5.51 in United States on 21 May 2023 18:44 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:	5.5M
Depth:	2.12 Km
Lat/Lon:	40.4056664 , -125.4869995
Event Date:	21 May 2023 18:44 UTC 21 May 2023 10:44 Local
Exposed Population:	Few people affected in MMI&>=III
Source:	NCAL SS nc73890906
Inserted at:	21 May 2023 18:48 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
NCAL SS	0		0
nc73890906	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
1506894	21 May 2023 18:44	5.51M, 2.12km	3.64	Few people (in 100km)	00:04	NCAL SS
1506895	21 May 2023 18:44	5.63M, 2.12km	3.83	N/A (in MMI>=VII)	00:05	NCAL SS
1506905	21 May 2023 18:44	5.54M, 10km	3.86	N/A (in MMI>=VII)	00:53	NCAL SS

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	<1000 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.

Ports

Name	LOCODE	Country	Distance
Cape Mendocino		Wake Island	92 km

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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