M 6.4 in Northern Mariana Islands on 28 Aug 2018 22:35 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: 59.9 Km
Event Date: 28 Aug 2018 22:35 UTC
29 Aug 2018 08:35 Local
Exposed Population: No people within 100km
Source: NEIC us1000gj78
Inserted at: 28 Aug 2018 22:56 UTC
INFORM Coping capacity of the alert score:
1.1 (Northern Mariana Is.)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us1000gj78 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
1226168 0 28 Aug 2018 22:35 6.5M, 10km N/A No people affected (in 100km) 0m (at 00:00) 00:06 GEOFON
1226170 0 28 Aug 2018 22:35 6.6M, 51.3km 4.1 N/A (in MMI>=VII) 0m (at 00:00) 00:10 PTWC
1226172 0 28 Aug 2018 22:35 6.6M, 53km N/A No people affected (in 100km) 0m (at 00:00) 00:11 NTWC    
1226176 0 28 Aug 2018 22:35 6.4M, 59.9km 4.04 N/A (in MMI>=VII) 0m (at 00:00) 00:20 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: "136km ENE of Anatahan"

Fault parameters

  • Latitude: 16.761
  • Longitude: 146.872
  • Length: 25 km
  • Width: 7 km
  • Magnitude: 6.4 M

Okada parameters:

  • Slip: .6 m
  • Strike: 180 (geogr angle: north=0, south=180)
  • Dip: 26 degree
  • Rake: 90 degree
  • Depth: 60 km

Calculation parameters

  • Calculation space (lon/lat): 145.372, 15.261, 148.372, 18.261
  • Instead of Step -> use Cell size:.25 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.