Overall Green Earthquake alert in American Samoa on 21 Aug 2017 21:12 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 American Samoa on 21 Aug 2017 21:12 UTC

Hazard models

EQ parameters

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:	10 Km
Lat/Lon:	-15.4752 , -171.5654
Event Date:	21 Aug 2017 21:12 UTC 21 Aug 2017 10:12 Local
Exposed Population:	No people within 100km
Source:	NEIC us2000aaei
Inserted at:	21 Aug 2017 21:40 UTC
INFORM Coping capacity of the alert score	1.1 (American Samoa)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake		GDACS score
NEIC	0		0
us2000aaei	Scaled population (vector)	0
	C1 earthquake	1
	C2 earthquake	0
	Country Vulnerability	0
	INFORM_normalised	1

Maximum expected impact using different data sources.

Episode Timeline

ID	Alert	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1178159		0	21 Aug 2017 21:12	5.4M, 37.8km	N/A	No people affected (in 100km)		00:17	PTWC
1178161		0	21 Aug 2017 21:12	5.4M, 10km	N/A	No people affected (in 100km)		00:27	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 American Samoa , of American Samoa (population 53,000) .

Radius	Population
100 km	no 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

Region Province	Country	Population
American Samoa	American Samoa	53000 people
Samoa	Samoa	160000 people
Niue	Niue	2000 people
Tonga	Tonga	98000 people

Critical infrastructure

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

More information

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

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