M 7 in Antarctica on 23 Jan 2021 23:36 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: 7.0M
Depth: 7.76 Km
Event Date: 23 Jan 2021 23:36 UTC
23 Jan 2021 19:36 Local
Exposed Population: No people within 100km
Source: NEIC us7000d2rx
Inserted at: 23 Jan 2021 23:56 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us7000d2rx Scaled population (raster) 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
1354501 0 23 Jan 2021 23:36 7.3M, 10km N/A No people affected (in 100km) 0m (at 00:00) 00:14 NTWC
1354505 0 23 Jan 2021 23:36 7M, 7.76km 4.86 No people affected (in 100km) 0m (at 00:00) 00:19 NEIC
1354516 0 23 Jan 2021 23:36 6.9M, 9.58km 5.18 No people affected (in 100km) 0m (at 00:00) 01:11 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: ""M 7, South Shetland Islands""

Fault parameters

  • Latitude: -61.848
  • Longitude: -55.559
  • Length: 50 km
  • Width: 14 km
  • Magnitude: 7 M

Okada parameters:

  • Slip: 1.3 m
  • Strike: 90 (geogr angle: north=0, south=180)
  • Dip: 45 degree
  • Rake: 90 degree
  • Depth: 8 km

Calculation parameters

  • Calculation space (lon/lat): -60.059, -66.348, -51.059, -57.348
  • Instead of Step -> use Cell size:.75 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.