Overall Green Earthquake alert in Japan on 12 Dec 2025 03:21 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 5.5 in Japan on 12 Dec 2025 03:21 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:	45.6 Km
Lat/Lon:	41.028 , 142.8998
Event Date:	12 Dec 2025 03:21 UTC 12 Dec 2025 13:21 Local
Exposed Population:	40 thousand in MMI IV
Source:	NEIC us6000rucc
Inserted at:	12 Dec 2025 03:40 UTC
INFORM Coping capacity of the alert score:	1.1 (Japan)

GDACS Score

For more info on GDACS score click here.

	Earthquake (Shakemap)		GDACS score
NEIC	0		0
us6000rucc	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
1676832		0	12 Dec 2025 03:21	5.5M, 45.6km	3.59	N/A (in MMI>=VII)		00:18	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 Japan ,of Hokkaido (population 5,808,054) . 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	1676832	142.9/41.028	5.5	45.6	3.592	12 Dec 2025 03:46	00:25	(new episode)
2	1676832	142.9/41.028	5.5	45.6	3.592	12 Dec 2025 03:54	00:32	(upd of #1)
3	1676832	142.9/41.028	5.5	45.6	3.566	12 Dec 2025 05:44	02:23	(upd of #2)
4	1676832	142.9/41.028	5.5	45.6	3.592	13 Dec 2025 14:00	1d 10:39	(upd of #3)

Affected Provinces

Region Province	Country	Population
Hokkaido	Japan	no people
Tohoku	Japan	36000 people
Hokkaido	Japan	230000 people
Tohoku	Japan	590000 people

Affected populated places. Areas of interest

Name	Region Province	Country	City class	Population	Distance
Ichikawa	Aomori	Japan	Village	-	130 km
Erimo	Hokkaido	Japan	Village	-	105 km
Chipira	Hokkaido	Japan	Village	-	115 km
Kawajiri	Iwate	Japan	Village	-	122 km
Taneichi	Iwate	Japan	Village	-	122 km
Samani	Hokkaido	Japan	Village	-	123 km
Kanahama	Aomori	Japan	Village	-	123 km
Uge	Iwate	Japan	Village	-	125 km
Urakawa	Hokkaido	Japan	Village	-	126 km
Nishicha	Hokkaido	Japan	Village	-	127 km
Tomari	Aomori	Japan	Village	-	127 km
Dedo	Aomori	Japan	Village	-	128 km
Kodanosawa	Aomori	Japan	Village	-	128 km
Shiriya	Aomori	Japan	Village	-	128 km
Rokkasho	Aomori	Japan	Village	-	129 km
Hachinohe	Aomori	Japan	City	240000 people	129 km
Kurauchi	Aomori	Japan	Village	-	129 km
Sarugamori	Aomori	Japan	Village	-	130 km
Ogifushi	Hokkaido	Japan	Village	-	131 km
Akedo	Iwate	Japan	Village	-	132 km
Kuji	Iwate	Japan	Village	-	132 km
Tanichito	Aomori	Japan	Village	-	132 km
Kudschi	Iwate	Japan	Village	-	134 km
Furumagi	Aomori	Japan	Village	-	134 km
Tashiro	Aomori	Japan	Village	-	135 km
Misawa	Aomori	Japan	Village	43000 people	135 km
Futatsuya	Iwate	Japan	Village	-	135 km
Ono	Iwate	Japan	Village	-	136 km
Ogara	Aomori	Japan	Village	-	136 km
Noda	Iwate	Japan	Village	-	137 km
Kerimabu	Hokkaido	Japan	Village	-	137 km
Chikagawa	Aomori	Japan	Village	-	137 km
Mita	Aomori	Japan	Village	-	138 km
Sabishiro	Aomori	Japan	Village	-	138 km
Yokohama	Aomori	Japan	Village	-	138 km
Mikkamachi	Iwate	Japan	Village	-	139 km
Utabue	Hokkaido	Japan	Village	-	139 km
Mena	Aomori	Japan	Village	-	140 km
Noda-Tamagawa	Iwate	Japan	Village	-	140 km
Fudai	Iwate	Japan	Village	-	141 km
Ichinosawa	Aomori	Japan	Village	-	142 km
Arito	Aomori	Japan	Village	-	144 km
Tanabu	Aomori	Japan	Village	-	144 km
Mutsu	Aomori	Japan	Village	49000 people	145 km
Karumai	Iwate	Japan	Village	-	145 km
Sekine	Aomori	Japan	Village	-	146 km
Gonohe	Aomori	Japan	Village	-	147 km
Ominato	Aomori	Japan	Village	-	147 km
Kenyoshi	Aomori	Japan	Village	-	147 km
Fujishima	Aomori	Japan	Village	-	148 km
Higashi-shizunai	Hokkaido	Japan	Village	-	148 km
Ohata	Aomori	Japan	Village	-	151 km
Jogasawa	Aomori	Japan	Village	-	151 km
Shizunai	Hokkaido	Japan	Village	22000 people	152 km
Omoto	Iwate	Japan	Village	-	153 km
Niikappu	Hokkaido	Japan	Village	-	156 km
Sariwarabe	Hokkaido	Japan	Village	-	158 km
Kominato	Aomori	Japan	Village	-	164 km
Taro	Iwate	Japan	Village	-	164 km
Mombetsu	Hokkaido	Japan	Village	-	175 km
Oma	Aomori	Japan	Village	-	175 km
Neichi	Iwate	Japan	Village	-	178 km
Wainai	Iwate	Japan	Village	-	180 km
Tsugaruishi	Iwate	Japan	Village	-	181 km
Nagaimura	Iwate	Japan	Village	-	183 km
Mukawa	Hokkaido	Japan	Village	-	190 km
Kanita	Aomori	Japan	Village	-	190 km
Yukawa	Hokkaido	Japan	Village	-	195 km
Hama-atsuma	Hokkaido	Japan	Village	-	199 km
Shigenai	Akita	Japan	Village	-	204 km
Azuma	Hokkaido	Japan	Village	-	207 km
Kamuso	Hokkaido	Japan	Village	-	208 km
Tomakomai	Hokkaido	Japan	City	170000 people	209 km
Oji	Hokkaido	Japan	Village	-	210 km
Ono	Hokkaido	Japan	Village	-	211 km
Nishikioka	Hokkaido	Japan	Village	-	212 km
Shiraoi	Hokkaido	Japan	Village	21000 people	212 km
Kamaishi	Iwate	Japan	City	42000 people	213 km
Tono	Iwate	Japan	Village	27000 people	221 km
Sendachi	Akita	Japan	Village	-	234 km
Shuku	Iwate	Japan	Village	-	241 km
Rebun	Hokkaido	Japan	Village	-	258 km

see full list

Critical infrastructure

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

Airports

Intensity	Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)	Distance
	Hachinohe	HHE	46	Mil.	Paved	Yes	7300	132 km
	Misawa Naf	MSJ	36	Mil.	Paved	Yes	10000	134 km

Ports

Name	LOCODE	Country	Distance
Samani	JPSAM	Japan	122 km
Hachinohe	JPHHE	Japan	126 km
Ominato	JPOMT	Japan	147 km
Hakodate	JPHKD	Japan	200 km
Kamaishi	JPKIS	Japan	213 km

Dams

Reservoir	Dam Name	River	Year	Distance
Tenma	Tenma	Tsubokawa	1968	157 km
Niikappu	Niikappu	Niikappugawa	1974	178 km
Gandoko	Gando	Tandogawa	1960	186 km

Nuclear Power Plants

Site	Type	Name	Country	Distance
Site-Higashidōri	Nuclear Power Reactor	Higashi Dori-1	Japan	128 km
Site-Rokkasho	Nuclear Fuel Cycle	Rokkasho Spent Fuel Storage	Japan	133 km
Site-Rokkasho	Nuclear Fuel Cycle	Rokkasho Uranium Enrichment Plant	Japan	133 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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