M 7.3 in United States on 29 Jul 2021 06:15 UTC

Hazard models

EQ parameters
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: 7.3M
Depth: 3.4 Km
Event Date: 29 Jul 2021 06:15 UTC
28 Jul 2021 19:15 Local
Exposed Population: Less then 100 people in MMI V
No people within 100km
Source: ALASKA EC ak0219neiszm
Inserted at: 29 Jul 2021 06:35 UTC
INFORM Coping capacity of the alert score:
2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
ALASKA EC 0 0.5 0.5
ak0219neiszm Scaled population (vector) 0 Max wave alert 0m  
  C1 earthquake 1 Max wave realtime 0.5m  
  C2 earthquake 0      
  Country Vulnerability 0      
  INFORM_normalised 1      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1387963 0.2 29 Jul 2021 06:15 7.2M, 35km N/A No people affected (in 100km) 0.3m (at 00:54) 00:08 ALASKA EC
1387964 0.5 29 Jul 2021 06:15 7.3M, 3.4km 5.28 N/A (in MMI>=VII) 0.5m (at 01:06) 00:19 ALASKA EC
1387970 0.6 29 Jul 2021 06:15 7.3M, 5.5km N/A No people affected (in 100km) 0.6m (at 00:54) 00:24 ALASKA EC
1387980 1.7 29 Jul 2021 06:15 8.2M, 46.66km 6.42 N/A (in MMI>=VII) 2.4m (at 00:50) 00:35 NEIC
1388004 1.8 29 Jul 2021 06:15 8.2M, 32.2km 7.55 1 thousand (in MMI>=VII) 2.6m (at 00:50) 01:40 ALASKA EC
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  0.5m in Mitrofania, United States. This height is estimated for 29-Jul-2021 07:21:84.

Alert Date (UTC) Name Country Wave height (m)
29-Jul-2021 07:21:84 Mitrofania United States  0.5
29-Jul-2021 07:04:64 Perryville United States  0.3
29-Jul-2021 09:42:24 Village United States  0.1
29-Jul-2021 09:25:55 Sand Point United States  0.1
29-Jul-2021 09:25:55 Sand_Point_AK USA  0.1
29-Jul-2021 09:25:72 Unga United States  0.1
29-Jul-2021 08:30:84 Kaguyak United States  0.1

See full locations list (RSS)


Initial conditions

Title: ""M 7.3, 106 km SE of Perryville, Alaska""

Fault parameters

  • Latitude: 55.307
  • Longitude: -157.828
  • Length: 70 km
  • Width: 19 km
  • Magnitude: 7.3 M

Okada parameters:

  • Slip: 1.9 m
  • Strike: 247 (geogr angle: north=0, south=180)
  • Dip: 15 degree
  • Rake: 90 degree
  • Depth: 3 km

Calculation parameters

  • Calculation space (lon/lat): -163.828, 49.307, -151.828, 61.307
  • Instead of Step -> use Cell size:1 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.