M 6.4 in Japan on 09 Nov 2025 08:54 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: 6.4M
Depth: 10 Km
Event Date: 09 Nov 2025 08:54 UTC
09 Nov 2025 18:54 Local
Exposed Population: 1.2 million in MMI IV
Source: NEIC us6000rmep
Inserted at: 09 Nov 2025 09:14 UTC
INFORM Coping capacity of the alert score:
1.1 (Japan)

GDACS Score

For more info on GDACS score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0.1 0.1
us6000rmep Scaled population (raster) 0 Max wave alert 0.17m  
  C1 shakemap 0 Max wave realtime 0.17m  
  C2 shakemap 0      
  Country Vulnerability 0      
  INFORM_normalised 0      
Maximum expected impact using different data sources.
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Episode Timeline

IDLevelScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1670965 0.1 09 Nov 2025 08:54 6.4M, 10km 4.22 N/A (in MMI>=VII) 0.2m (at 00:30) 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.

Tsunami affected locations


Initial conditions

Title: ""M 6.4, 121 km E of Yamada, Japan""

Fault parameters

  • Latitude: 39.466
  • Longitude: 143.363
  • Length: 25 km
  • Width: 7 km
  • Magnitude: 6.4 M

Okada parameters:

  • Slip: .6 m
  • Strike: 185 (geogr angle: north=0, south=180)
  • Dip: 19 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): 141.863, 37.966, 144.863, 40.966
  • Instead of Step -> use Cell size:.25 minutes

Sea Level

More information

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