Overall Green Earthquake alert in Samoa Islands Region from 04 Dec 2022 19:24 UTC to 19:24

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 6.9 in Samoa Islands Region from 04 Dec 2022 19:24 UTC to 19:24

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:	6.9M
Depth:	33 Km
Event Date:	04 Dec 2022 19:24 UTC 04 Dec 2022 07:24 Local
Exposed Population:	1 thousand in MMI&>=IV
Source:	PTWC pt22338001
Inserted at:	04 Dec 2022 19:32 UTC
INFORM Coping capacity of the alert score:	1.1 ()

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Rapid Impact)		Tsunami		GDACS score
PTWC	0		0.1		0.1
pt22338001	Scaled population (vector)	0	Max wave alert	0.16m
	C1 rapid impact	0	Max wave realtime	0.16m
	C2 rapid impact	0
	Country Vulnerability	0
	INFORM_normalised	0

Maximum expected impact using different data sources.

Click on image to zoom it.

Episode Timeline

ID	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1476910	0.1	04 Dec 2022 19:24	6.9M, 33km	N/A	1 thousand (in 100km)	0.2m (at 00:17)	00:08	PTWC
1476912	0	04 Dec 2022 19:24	6.9M, 148km	N/A	1 thousand (in 100km)	0m (at 00:00)	00:13	NTWC
1476914	0	04 Dec 2022 19:24	6.7M, 35.999km	4.83	N/A (in MMI>=VII)	0m (at 00:00)	00:19	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.

Tsunami affected locations

The maximum Wave height is 0.2m in Hihifo, Tonga. This height is estimated for 4-Dec-2022 19:41:52.

Alert	Date (UTC)	Name	Country	Wave height (m)
	4-Dec-2022 19:41:52	Hihifo	Tonga	0.2
	4-Dec-2022 19:41:52	Falehau	Tonga	0.2
	4-Dec-2022 19:56:68	Samatau	Samoa	0.1
	4-Dec-2022 19:56:68	Faleaseela	Samoa	0.1
	4-Dec-2022 19:47:14	Matautu	Samoa	0.1
	4-Dec-2022 19:46:93	Lotofago	Samoa	0.1
	4-Dec-2022 20:01:88	Poloa	American Samoa	0.1
	4-Dec-2022 20:01:88	Amanave	American Samoa	0.1
	4-Dec-2022 20:01:88	Fagamalo	American Samoa	0.1
	4-Dec-2022 20:10:13	Alaufau	American Samoa	0.1
	4-Dec-2022 20:10:13	Lalomoana	American Samoa	0.1
	4-Dec-2022 20:10:13	Olosega	American Samoa	0.1
	4-Dec-2022 19:53:33	Fagasa	American Samoa	0.1
	4-Dec-2022 19:53:33	Nuuuli	American Samoa	0.1
	4-Dec-2022 19:53:33	Fagatogo	American Samoa	0.1
	4-Dec-2022 19:53:33	Utulei	American Samoa	0.1
	4-Dec-2022 19:53:33	Matuu	American Samoa	0.1
	4-Dec-2022 19:53:33	Fagaalu	American Samoa	0.1
	4-Dec-2022 19:53:33	Lauliifou	American Samoa	0.1
	4-Dec-2022 19:53:33	Aunuu	American Samoa	0.1
	4-Dec-2022 20:32:29	Pago Pago	American Samoa	0.1
	4-Dec-2022 20:32:29	Siufaga	American Samoa	0.1
	4-Dec-2022 20:32:29	Atuu	American Samoa	0.1
	4-Dec-2022 20:32:29	Leloaloa	American Samoa	0.1
	4-Dec-2022 20:32:29	Aua	American Samoa	0.1
	4-Dec-2022 20:32:29	Afono	American Samoa	0.1
	4-Dec-2022 20:32:29	Masefau	American Samoa	0.1
	4-Dec-2022 20:32:29	Auto	American Samoa	0.1
	4-Dec-2022 20:32:29	Fagaitua	American Samoa	0.1
	4-Dec-2022 20:32:29	Alofau	American Samoa	0.1
	4-Dec-2022 20:32:29	Aoa	American Samoa	0.1
	4-Dec-2022 20:32:29	Amouli	American Samoa	0.1
	4-Dec-2022 20:32:29	Onenoa	American Samoa	0.1
	4-Dec-2022 20:32:29	Alao	American Samoa	0.1
	4-Dec-2022 20:32:29	Tula	American Samoa	0.1
	4-Dec-2022 20:32:29	Pago Pago	Samoa	0.1
	4-Dec-2022 20:32:29	Pago_Pago_AS	USA	0.1
	4-Dec-2022 19:46:93	Siumu	Samoa	0.1
	4-Dec-2022 19:59:16	Amaile	Samoa	0.1

See full locations list (RSS)

Initial conditions

Title: ""134 km E of Hihifo""

Fault parameters

Latitude: -15.74
Longitude: -172.557
Length: 44 km
Width: 12 km
Magnitude: 6.9 M

Okada parameters:

Slip: 1.2 m
Strike: 149 (geogr angle: north=0, south=180)
Dip: 8 degree
Rake: 90 degree
Depth: 33 km

Calculation parameters

Calculation space (lon/lat): -175.557, -18.74, -169.557, -12.74
Instead of Step -> use Cell size:.5 minutes

Sea Level

More information

Timeline:
Tsunami calculations performed to this case, click here
Montecarlo:
Tsunami Montecarlo simulation performed to this case, click here

Populated places affected by tsunami:
http://webcritech.jrc.ec.europa.eu/ModellingOutput/TsunamiSurge/JETS_System/2022/12/34612/locations.xml
Populated places affected by tsunami (KML):
http://webcritech.jrc.ec.europa.eu/ModellingOutput/TsunamiSurge/JETS_System/2022/12/34612/locations.kml

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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