Overall Green Earthquake in Guam on 04 Nov 2025 07:37 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve awareness, information exchange and coordination in the first phase after major sudden-onset disasters.

M 5.9 in Guam on 04 Nov 2025 07:37 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:	5.9M
Depth:	66 Km
Lat/Lon:	12.386 , 143.1363
Event Date:	04 Nov 2025 07:37 UTC 04 Nov 2025 17:37 Local
Exposed Population:	180 thousand in MMI III
Source:	NEIC us6000rlcd
Inserted at:	04 Nov 2025 07:57 UTC
INFORM Coping capacity of the alert score:	1.1 (Guam)

GDACS Score

For more info on GDACS score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us6000rlcd	Scaled population (raster)	0
	C1 shakemap	0
	C2 shakemap	0
	Country Vulnerability	0
	INFORM_normalised	0
	Score no CC	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	Level	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1670088		0	04 Nov 2025 07:37	5.8M, 107.1km	3.76	No people affected (in 100km)		00:15	PTWC
1670089		0	04 Nov 2025 07:37	5.9M, 66km	3.42	N/A (in MMI>=VII)		00:20	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 Guam ,of Guam (population 45,586) . 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	1670089	143.136/12.386	5.9	66	3.37	04 Nov 2025 08:02	00:25	(new episode)
2	1670089	143.136/12.386	5.9	66	3.317	04 Nov 2025 08:08	00:31	(upd of #1)
3	1670089	143.136/12.386	5.9	66	3.317	04 Nov 2025 10:01	02:24	(upd of #2)
4	1670089	143.136/12.386	5.9	66	3.345	05 Nov 2025 14:03	1d 06:25	(upd of #3)

Affected Provinces

Intensity	Region Province	Country	Population
	Guam	Guam	46000 people

Affected populated places. Areas of interest

Name	Country	City class	Population	Distance
Merizo	Guam	Village	1700 people	193 km
Umatac	Guam	Village	-	194 km
Inarajan	Guam	Village	<1000 people	200 km
Camp Bright	Guam	Village	-	201 km
Yona	Guam	Village	2300 people	210 km
Sinajana	Guam	Village	2100 people	212 km
Mongmong	Guam	Village	3700 people	213 km
Camp Quezon	Guam	Village	-	216 km
Barrigada	Guam	Village	4700 people	217 km

see full list

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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