M 6.9 in Central Mid-Atlantic Ridge on 18 Sep 2020 21:43 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: 6.9M
Depth: 10 Km
Event Date: 18 Sep 2020 21:43 UTC
18 Sep 2020 19:43 Local
Exposed Population: No people within 100km
Source: NEIC us7000bq10
Inserted at: 18 Sep 2020 23:49 UTC
INFORM Coping capacity of the alert score:
1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us7000bq10 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
1333485 0 18 Sep 2020 21:43 6.8M, 33km N/A No people affected (in 100km) 0m (at 00:00) 00:13 PTWC
1333486 0 18 Sep 2020 21:44 6.8M, 33km N/A No people affected (in 100km) 0m (at 00:00) 00:15 NTWC
1333489 0 18 Sep 2020 21:43 6.9M, 10km 3.45 No people affected (in 100km) 0m (at 00:00) 02:05 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 6.9, central Mid-Atlantic Ridge""

Fault parameters

  • Latitude: .96
  • Longitude: -26.833
  • Length: 44 km
  • Width: 12 km
  • Magnitude: 6.9 M

Okada parameters:

  • Slip: 1.2 m
  • Strike: 270 (geogr angle: north=0, south=180)
  • Dip: 45 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): -29.833, -2.04, -23.833, 3.96
  • Instead of Step -> use Cell size:.5 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.