M 7.8 in Bonin Islands, Japan Region on 30 May 2015 11:23 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: 7.8M
Depth: 677.56 Km
Event Date: 30 May 2015 11:23 UTC
30 May 2015 20:23 Local
Exposed Population: About 2000 people in MMI
No people within 100km
Source: NEIC
Inserted at: 30 May 2015 11:43 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
NEIC 0 0 0
Scaled population (vector) n.a Max wave scenario 0m  
  C1 earthquake n.a Max wave realtime 0m  
  C2 earthquake n.a      
  Country Vulnerability n.a      
  INFORM_normalised n.a      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1082609 0 30 May 2015 11:23 7.7M, 704km N/A No people affected (in 100km) 0m (at 00:00) 00:06 GEOFON
1082611 0.1 30 May 2015 11:23 8.5M, 696km N/A No people affected (in 100km) 0.2m (at 04:22) 00:14 PTWC
1082616 0.1 30 May 2015 11:23 8.5M, 696km N/A No people affected (in 100km) 0.1m (at 04:06) 00:16 NTWC    
1082617 0 30 May 2015 11:23 7.8M, 677.56km N/A 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: " 189km WNW of Chichi-shima"

Fault parameters

  • Latitude: 27.831
  • Longitude: 140.493
  • Length: 125 km
  • Width: 35 km
  • Magnitude: 7.8 M

Okada parameters:

  • Slip: 3.2 m
  • Strike: 154 (geogr angle: north=0, south=180)
  • Dip: 20 degree
  • Rake: 90 degree
  • Depth: 678 km

Calculation parameters

  • Calculation space (lon/lat): 128.493, 15.831, 152.493, 39.831
  • Instead of Step -> use Cell size:1.78 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.