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

The earthquake happened in Japan ,of Hokkaido (population 5,808,054) . The alertlevel for this event is GREEN

Intensity Population
19000 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

Intensity Region Province Country Population
Hokkaido Japan no people
Hokkaido Japan 18000 people
Hokkaido Japan 2.2 million people
Tohoku Japan 47000 people
Hokkaido Japan 12000 people
Tohoku Japan 5900 people


Critical infrastructure

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

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Obihiro OBO 149 Civ. Paved Yes 8200 105 km
Tokachi 84 Civ. Paved Yes 4900 121 km
Sapporo-New Chitose CTS 21 Civ. Paved Yes 9800 140 km
Sappora / Chitose 27 Mil. Paved Yes 9800 143 km
Sapporo OKD 8 Civ. Paved Yes 4500 186 km

Ports

Intensity Name LOCODE Country Distance
Samani JPSAM Japan 33 km
Tokachi JPTOK Japan 61 km
Otsu JPOTU Japan 117 km
Tomakomai JPTMK Japan 133 km
Ominato JPOMT Japan 150 km

Dams

Intensity Reservoir Dam Name River Year Distance
Samaniko Samani Samanigawa 1974 41 km
Horomanko Horomangawadaisan Horomangawa 1954 38 km
Mitsuishi Mitsuishi Mitsuishigawa 1991 62 km
Shizunaichoseichi Shizunai Shizunaigawa 1966 68 km
Takamiko Takami Shizunaigawa 1983 71 km
Higashinosawachoseichi Higashinosawa Koikakushushibicharigawa 1987 71 km

More information

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