M 5.5 in South Of Alaska on 30 Jul 2021 03:52 UTC
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: 5.5M
Depth: 33 Km
Lat/Lon: 55.3509 , -156.9768
Event Date: 30 Jul 2021 03:52 UTC
29 Jul 2021 17:52 Local
Exposed Population: No people affected in MMI IV
No people within 100km
Source: ALASKA EC ak0219p0hp3k
Inserted at: 30 Jul 2021 04:18 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)
GDACS score
ALASKA EC 0 0
ak0219p0hp3k Scaled population (vector) 0  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 0.65  
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

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1388300 0 30 Jul 2021 03:52 5.4M, 52km N/A No people affected (in 100km) 00:06 ALASKA EC
1388301 0 30 Jul 2021 03:52 5.4M, 47.7km N/A No people affected (in 100km) 00:09 ALASKA EC
1388304 0 30 Jul 2021 03:52 5.4M, 2.8km 3.58 less than 100 (in MMI>=VII) 00:11 ALASKA EC
1388305 0 30 Jul 2021 03:52 5.8M, 5km 3.58 less than 100 (in MMI>=VII) 00:12 ALASKA EC
1388306 0 30 Jul 2021 03:52 5.4M, 5km 3.08 less than 100 (in MMI>=VII) 00:14 ALASKA EC
1388309 0 30 Jul 2021 03:52 5.5M, 33km 3.16 less than 100 (in MMI>=VII) 00:26 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.

Exposed population

The earthquake happened in unknowed a zone. The alertlevel for this event is GREEN

Intensity Population


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1388304 55.38/-156.983 5.4 52.0 3.581 30 Jul 2021 04:03 00:11 (new episode)
2 0 1388306 55.408/-157.001 5.4 2.8 3.082 30 Jul 2021 04:05 00:13 (new episode)
3 0 1388309 55.351/-156.977 5.5 33.0 3.162 30 Jul 2021 04:23 00:31 (new episode)

Affected Provinces



Critical infrastructure

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

More information

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