Overall Green Earthquake in Japan on 09 Nov 2025 08:54 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 6.4 in Japan on 09 Nov 2025 08:54 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:	6.4M
Depth:	10 Km
Lat/Lon:	39.4662 , 143.3632
Event Date:	09 Nov 2025 08:54 UTC 09 Nov 2025 18:54 Local
Exposed Population:	1.2 million in MMI IV
Source:	NEIC us6000rmep
Inserted at:	09 Nov 2025 09:14 UTC
INFORM Coping capacity of the alert score:	1.1 (Japan)

GDACS Score

For more info on GDACS score click here.

	Earthquake (Shakemap)		Tsunami		GDACS score
NEIC	0		0.1		0.1
us6000rmep	Scaled population (raster)	0	Max wave alert	0.17m
	C1 shakemap	0	Max wave realtime	0.17m
	C2 shakemap	0
	Country Vulnerability	0
	INFORM_normalised	0
	Score no CC	raster

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
1670965		0.1	09 Nov 2025 08:54	6.4M, 10km	4.22	N/A (in MMI>=VII)	0.2m (at 00:30)	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

Intensity	Population
	no people

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1670965	143.363/39.466	6.4	10	4.188	09 Nov 2025 09:16	00:22	(new episode)
2	1670965	143.363/39.466	6.4	10	4.188	09 Nov 2025 09:20	00:26	(upd of #1)
3	1670965	143.363/39.466	6.4	10	4.188	09 Nov 2025 11:18	02:23	(upd of #2)
4	1670965	143.363/39.466	6.4	10	4.219	10 Nov 2025 14:01	1d 05:06	(upd of #3)

Affected Provinces

Critical infrastructure

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

Nuclear Facilities

Site Name	Type	Name	Country	Distance
Site-Onagawa	Nuclear Power Reactor	Onagawa-2	Japan	200 km
Site-Onagawa	Nuclear Power Reactor	Onagawa-3	Japan	200 km
Site-Onagawa	Nuclear Power Plant	Onagawa-1	Japan	200 km

More information

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

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