M 6 in Japan on 23 Aug 2026 13:44 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: 6.0M
Depth: 42.9 Km
Lat/Lon: 41.8344 , 142.8255
Event Date: 23 Aug 2026 13:44 UTC
23 Aug 2026 23:44 Local
Exposed Population: 20 thousand in MMI V
Source: NEIC us6000tmz6
Inserted at: 23 Aug 2026 14:05 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
us6000tmz6 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

IDLevelScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1728702 0 23 Aug 2026 13:44 6M, 42.9km 5.42 N/A (in MMI>=VII) 00:20 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
<1000 people


Shakemaps Timeline

LevelShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1728702 142.826/41.834 6 42.9 4.435 23 Aug 2026 14:09 00:24 (new episode)
2 0 1728702 142.826/41.834 6 42.9 4.435 23 Aug 2026 15:48 02:04 (upd of #1)
3 0 1728702 142.826/41.834 6 42.9 4.484 24 Aug 2026 14:01 1d 00:16 (upd of #2)
4 0 1728702 142.802/41.85 6 41 5.551 30 Aug 2026 02:03 6d 12:18 (upd of #3)

Affected Provinces



Critical infrastructure

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

Nuclear Facilities

Site Name Type Name Country Distance
Site-Higashi Dori Nuclear Power Reactor Higashi Dori-1 Japan 140 km

More information

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