M 6.4 in Tonga on 01 Oct 2020 01:13 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: 6.4M
Depth: 28 Km
Event Date: 01 Oct 2020 01:13 UTC
01 Oct 2020 14:13 Local
Exposed Population: About 1000 people in MMI
About 15000 people within 100km
Source: NEIC us6000c3kz
Inserted at: 02 Oct 2020 01:18 UTC
INFORM Coping capacity of the alert score:
4.6 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us6000c3kz 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 0.94      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1335549 0 01 Oct 2020 01:13 6.7M, 10km N/A 20 thousand (in 100km) 0m (at 00:00) 00:08 PTWC
1335550 0 01 Oct 2020 01:13 6.7M, 10km N/A 20 thousand (in 100km) 0m (at 00:00) 00:09 NTWC
1335555 0 01 Oct 2020 01:13 6.4M, 35km 5.85 N/A (in MMI>=VII) 0m (at 00:00) 01:01 NEIC
1335735 0 01 Oct 2020 01:13 6.4M, 28km 5.85 N/A (in MMI>=VII) 0m (at 00:00) 1d 00:04 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 6.4, 41 km NE of Pangai, Tonga""

Fault parameters

  • Latitude: -19.536
  • Longitude: -174.083
  • Length: 25 km
  • Width: 7 km
  • Magnitude: 6.4 M

Okada parameters:

  • Slip: .6 m
  • Strike: 200 (geogr angle: north=0, south=180)
  • Dip: 33 degree
  • Rake: 90 degree
  • Depth: 28 km

Calculation parameters

  • Calculation space (lon/lat): -175.583, -21.036, -172.583, -18.036
  • Instead of Step -> use Cell size:.25 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.