M 5.5 in Japan on 29 Oct 2018 01:27 UTC

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: 5.5M
Depth: 91.91 Km
Lat/Lon: 31.6008 , 140.3073
Event Date: 29 Oct 2018 01:27 UTC
Exposed Population: No people within 100km
Source: NEIC us1000hiby
Inserted at: 29 Oct 2018 01:47 UTC
INFORM Coping capacity of the alert score: 1.1 (Japan)


For more info on GDACS alert score click here.
GDACS score
NEIC 0 0
us1000hiby Scaled population 0  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1233875 0 29 Oct 2018 01:27 5.5M, 91.91km 3.26 No people affected 00:19 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
* 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.

Exposed population

The earthquake happened in unknowed a zone. The alertlevel for this event is GREEN

Intensity Population
no people

Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1233875 31.601/140.307 5.5 91.91 3.24 29 Oct 2018 01:47 00:19 (new episode)
2 0 1233875 31.601/140.307 5.5 91.91 3.24 29 Oct 2018 03:30 02:03 (upd of #1)
3 0 1233875 31.589/140.232 5.5 94 3.26 31 Oct 2018 02:20 2d 00:52 (upd of #2)

Affected Provinces

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Aogashima Shizuoka Japan Village5 - 109 km
Mitsune Shizuoka Japan City - 174 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.


Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Hachijo Jima HAC 92 Civ. Paved Yes 5900


Intensity Name LOCODE Country
Aoga Island Japan
Tori Island Japan
Yaene Japan

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.