M 6.6 in Japan from 01 May 2021 01:27 UTC to 01:27

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: 6.6M
Depth: 56 Km
Event Date: 01 May 2021 01:27 UTC
01 May 2021 10:27 Local
Exposed Population: 2180000 people within 100km
Source: NTWC at00qsempq
Inserted at: 01 May 2021 01:42 UTC
INFORM Coping capacity of the alert score:
1.5 (Japan)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
NTWC 0.1 0 0.1
at00qsempq Scaled population (vector) 5.57 Max wave alert 0m  
  C1 earthquake 0.73 Max wave realtime 0m  
  C2 earthquake -0.22      
  Country Vulnerability -0.71      
  INFORM_normalised 0.57      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1372992 0.1 01 May 2021 01:27 6.6M, 56km N/A 2.2 million (in 100km) 0m (at 00:00) 00:08 PTWC
1372994 0.1 01 May 2021 01:27 6.6M, 56km N/A 2.2 million (in 100km) 0m (at 00:00) 00:14 NTWC
1372999 0 01 May 2021 01:27 6.8M, 47.3km 6.42 less than 100 (in MMI>=VII) 0.1m (at 00:52) 00:21 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

See full locations list (RSS)


Initial conditions

Title: ""56 km SE of Ishinomaki""

Fault parameters

  • Length: 31 km
  • Width: 8 km
  • Magnitude: 6.6 M

Okada parameters:

  • Slip: .9 m
  • Strike: 198 (geogr angle: north=0, south=180)
  • Dip: 21 degree
  • Rake: 90 degree
  • Depth: 56 km

Calculation parameters

  • Calculation space (lon/lat): 140.3, 36.6, 143.3, 39.6
  • Instead of Step -> use Cell size:.25 minutes

Sea Level

More information

  • Timeline:
    Tsunami calculations performed to this case, click here

  • Montecarlo:
    Tsunami Montecarlo simulation performed to this case, click here

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