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 16:30 message from NTWC

Key information extracted from original GTS message :

Evaluation

There is no TSUNAMI danger for the u s west coast BRITISH columbia or alaska
Some of the areas listed above MAY experience non-damaging sea level changes
Sea level observations indicate a TSUNAMI was generated

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)
Kushiro (Japan)	42.97	144.38	07:20	0.12	-
Ofunato (Japan)	39.06	141.73	07:12	0.15	-

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
NTWC	Kushiro (Japan)	42.97	144.38	07:20	0.12	-
NTWC	Ofunato (Japan)	39.06	141.73	07:12	0.15	-

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