M 7.1 in South Georgia and the South Sandwich Islands on 11 Dec 2018 02:26 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: 7.1M
Depth: 164.66 Km
Event Date: 11 Dec 2018 02:26 UTC
11 Dec 2018 00:26 Local
Exposed Population: No people within 100km
Source: NEIC us2000isc8
Inserted at: 11 Dec 2018 02:43 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us2000isc8 Scaled population (vector) 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  C2 shakemap 0.53      
  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
1240721 0 11 Dec 2018 02:26 7.3M, 176.2km N/A No people affected (in 100km) 0m (at 00:00) 00:12 PTWC
1240723 0 11 Dec 2018 02:26 7.3M, 176km N/A No people affected (in 100km) 0m (at 00:00) 00:14 NTWC    
1240725 0 11 Dec 2018 02:26 7.1M, 164.66km 4.78 N/A (in MMI>=VII) 0m (at 00:00) 00:17 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

Alert Date (UTC) Name Country Wave height (m)

See full locations list (RSS)


Initial conditions

Title: ""48km N of Bristol Island""

Fault parameters

  • Latitude: -58.598
  • Longitude: -26.466
  • Length: 56 km
  • Width: 15 km
  • Magnitude: 7.1 M

Okada parameters:

  • Slip: 1.5 m
  • Strike: 24 (geogr angle: north=0, south=180)
  • Dip: 15 degree
  • Rake: 90 degree
  • Depth: 165 km

Calculation parameters

  • Calculation space (lon/lat): -30.966, -63.098, -21.966, -54.098
  • Instead of Step -> use Cell size:.75 minutes

Sea Level

More information

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

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