M 5.8 in Western Indian-Antarctic Ridge on 21 Apr 2018 19:44 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: 5.8M
Depth: 10 Km
Lat/Lon: -48.9234 , 123.6105
Event Date: 21 Apr 2018 19:44 UTC
22 Apr 2018 03:44 Local
Exposed Population: No people within 100km
Source: NEIC us1000dq0e
Inserted at: 21 Apr 2018 20:09 UTC
INFORM Coping capacity of the alert score: 1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us1000dq0e Scaled population (vector) -8  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 1  
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
1207609 0 21 Apr 2018 19:44 5.6M, 3.69km N/A N/A (in MMI>=VII) 00:21 NEIC
1207610 0 21 Apr 2018 19:44 5.8M, 10km N/A N/A (in MMI>=VII) 00:24 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.

Exposed population

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

Intensity Population
no people
no people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1207609 -48.93/123.613 5.6 3.69 0 21 Apr 2018 20:06 00:22 (new episode)
2 0 1207610 -48.93/123.613 5.6 3.69 0 21 Apr 2018 20:09 00:25 (new episode)
3 0 1207610 -48.923/123.61 5.8 10 0 21 Apr 2018 20:10 00:26 (upd of #2)
4 0 1207610 -48.923/123.61 5.8 10 0 21 Apr 2018 21:46 02:02 (upd of #3)

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.