M 6.37 in United States on 20 Dec 2022 10:34 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: 16.06 Km
Event Date: 20 Dec 2022 10:34 UTC
20 Dec 2022 02:34 Local
Exposed Population: 80 thousand (in MMI>=VII)
Source: NCAL SS nc73821036
Inserted at: 20 Dec 2022 10:40 UTC
INFORM Coping capacity of the alert score:
2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NCAL SS 0.9 0 0.9
nc73821036 Scaled population (raster) 3.96 Max wave alert 0.05m  
  C1 shakemap -0.59 Max wave realtime 0.05m  
  C2 shakemap 0.53      
  Country Vulnerability 0      
  INFORM_normalised 0.65      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1479670 0.2 20 Dec 2022 10:34 6.08M, 16.06km 6.81 2 thousand (in 100km) 00:04 NCAL SS
1479672 0.9 20 Dec 2022 10:34 6.37M, 16.06km 7.76 80 thousand (in MMI>=VII) 0.1m (at 00:55) 00:06 NCAL SS
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

The maximum Wave height is  0.1m in Fields Landing, United States. This height is estimated for 20-Dec-2022 11:29:84.

Alert Date (UTC) Name Country Wave height (m)
20-Dec-2022 11:29:84 Fields Landing United States  0.1
20-Dec-2022 11:29:84 Fairhaven United States  0.1
20-Dec-2022 11:29:84 Spruce Point United States  0.1

See full locations list (RSS)


Initial conditions

Title: ""12km WSW of Ferndale""

Fault parameters

  • Latitude: 40.523
  • Longitude: -124.393
  • Length: 24 km
  • Width: 6 km
  • Magnitude: 6.4 M

Okada parameters:

  • Slip: .7 m
  • Strike: 345 (geogr angle: north=0, south=180)
  • Dip: 9 degree
  • Rake: 90 degree
  • Depth: 16 km

Calculation parameters

  • Calculation space (lon/lat): -125.893, 39.023, -122.893, 42.023
  • 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.