Overall Green Earthquake in Japan on 26 Aug 2026 19:21 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 5.6 in Japan on 26 Aug 2026 19:21 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:	5.6M
Depth:	16 Km
Lat/Lon:	38.1821 , 143.8447
Event Date:	26 Aug 2026 19:21 UTC 27 Aug 2026 05:21 Local
Exposed Population:	100 thousand in MMI III
Source:	NEIC us7000tc18
Inserted at:	27 Aug 2026 16:15 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
us7000tc18	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
1729395		0	26 Aug 2026 19:21	5.6M, 10km	2.95	N/A (in MMI>=VII)		00:18	NEIC
1729589		0	26 Aug 2026 19:21	5.6M, 16km	2.91	N/A (in MMI>=VII)		20:53	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	1729395	143.848/38.129	5.6	10	3.02	26 Aug 2026 19:46	00:24	(new episode)
2	1729395	143.848/38.129	5.6	10	3.02	26 Aug 2026 19:51	00:30	(upd of #1)
3	1729395	143.848/38.129	5.6	10	3.024	26 Aug 2026 21:26	02:04	(upd of #2)
4	1729589	143.845/38.182	5.6	16.1	3.059	28 Aug 2026 02:06	1d 06:44	(new episode)

Affected Provinces

Critical infrastructure

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

More information

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

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