Overall Green Earthquake alert in Japan on 18 Sep 2023 13:21 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

M 6.3 in Japan on 18 Sep 2023 13:21 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:	6.3M
Depth:	183.5 Km
Lat/Lon:	26.4336 , 125.3032
Event Date:	18 Sep 2023 13:21 UTC 18 Sep 2023 21:21 Local
Exposed Population:
Source:	NEIC us7000kwg2
Inserted at:	18 Sep 2023 13:36 UTC
INFORM Coping capacity of the alert score:	1.1 (Japan)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		Tsunami		GDACS score
NEIC	0		0		0
us7000kwg2	Scaled population (vector)	0	Max wave alert	0m
	C1 shakemap	-0.59	Max wave realtime	0m
	C2 shakemap	0.53
	Country Vulnerability	0
	INFORM_normalised	1

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	Alert	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1526008		0	18 Sep 2023 13:21	6.3M, 183.5km	4	N/A (in MMI>=VII)	0m (at 00:00)	00:15	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 unknowed a zone. The alertlevel for this event is GREEN

Intensity	Population

Shakemaps Timeline

Shake id #	episodeid	Lat/Lon	Magnitude	Depth	Max MMI	Date shake (UTC)	Delay (hh:mm)
1	1526008	125.303/26.434	6.3	183.5	3.987	18 Sep 2023 13:39	00:17	(new episode)
2	1526008	125.303/26.434	6.3	183.5	3.995	18 Sep 2023 13:46	00:25	(upd of #1)
3	1526008	125.303/26.434	6.3	183.5	3.995	18 Sep 2023 15:25	02:04	(upd of #2)
4	1526008	125.303/26.434	6.3	183.5	3.995	19 Sep 2023 13:40	1d 00:19	(upd of #3)
5	1526008	125.231/26.531	6.3	176	3.999	26 Sep 2023 23:53	8d 10:31	(upd of #4)

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.

Disclaimer
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