Overall Green Earthquake in Japan on 08 Dec 2025 14:15 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 7.6 in Japan on 08 Dec 2025 14:15 UTC

2025-12-08 17:27 message from NTWC

Key information extracted from original GTS message :

Evaluation

An earthquake with a preliminary magnitude of 7.6 occurred in the hokkaido JAPAN region at 1415 UTC on monday december 8 2025
TSUNAMI waves have been observed
Based on all available data hazardous TSUNAMI waves are forecast for some coasts

Threat Forecast

TSUNAMI waves reaching 0.3 to 1 meters above the tide level are possible for some coasts of japan.
Actual amplitudes at the coast MAY vary from forecast amplitudes due to uncertainties in the forecast and local features. in particular maximum TSUNAMI amplitudes on atolls and at locations with fringing or barrier reefs will likely be much smaller than the forecast indicates.
For other areas covered by this product a forecast has not yet been computed. the forecast will be expanded if necessary in subsequent products.

Tsunami Observations

The following are tsunami wave observations from coastal and/or deep-ocean sea level gauges at the indicated locations the maximum tsunami height is measured with respect to the normal tide level

GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
Hakodate Jp	41.8	140.7	16: 36	0.19	26
Ofunato Honshu Jp	39	141.8	15: 12	0.16	10
Kushiro Jp	43	144.4	15: 20	0.12	**

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
PTWC	Hakodate Jp	41.8	140.7	16: 36	0.19	26
PTWC	Ofunato Honshu Jp	39	141.8	15: 12	0.16	10
PTWC	Kushiro Jp	43	144.4	15: 20	0.12	**

Disclaimer - Copyright
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.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.