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 16:21 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

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)
Ofunato Honshu Jp	39	141.8	15: 12	0.16	10
Kushiro Jp	43	144.4	15: 20	0.12	**
Hakodate Jp	41.8	140.7	15: 38	0.08	22

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
PTWC	Ofunato Honshu Jp	39	141.8	15: 12	0.16	10
PTWC	Kushiro Jp	43	144.4	15: 20	0.12	**
PTWC	Hakodate Jp	41.8	140.7	15: 38	0.08	22

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