M 5.5 in Japan on 21 May 2023 22:20 UTC

Hazard models

Rapid Impact
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: 5.5M
Depth: 184 Km
Lat/Lon: 29.8399 , 129.1289
Event Date: 21 May 2023 22:20 UTC
22 May 2023 07:20 Local
Exposed Population: Few people affected in MMI&>=III
Source: NEIC us6000kdrq
Inserted at: 23 May 2023 02:24 UTC
INFORM Coping capacity of the alert score: 1.1 (Japan)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us6000kdrq Scaled population (raster) 0  
  C1 shakemap 0  
  C2 shakemap 0  
  Country Vulnerability 0  
  INFORM_normalised 0  
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
1506930 0 21 May 2023 22:20 5.5M, 189.392km 3.46 N/A (in MMI>=VII) 00:12 NEIC
1507170 0 21 May 2023 22:20 5.5M, 184km 3.48 N/A (in MMI>=VII) 1d 04:04 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.

Exposed population

The earthquake happened in Japan ,of Kyushu (population 13,011) . 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 1506930 129.183/29.831 5.5 189.4 3.46 21 May 2023 22:36 00:16 (new episode)
2 0 1506930 129.183/29.831 5.5 189.4 3.46 21 May 2023 22:45 00:25 (upd of #1)
3 0 1506930 129.183/29.831 5.5 189.4 3.46 22 May 2023 00:25 02:05 (upd of #2)
4 0 1506930 129.183/29.831 5.5 189.4 3.46 22 May 2023 22:41 1d 00:21 (upd of #3)
5 0 1507170 129.129/29.84 5.5 184 3.485 23 May 2023 02:41 1d 04:21 (new episode)

Affected Provinces

Intensity Region Province Country Population
Kyushu Japan 43000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Naon Okinawa Japan Village - 167 km
Makurazuki Kagoshima Japan City - 193 km
Izashiki Kagoshima Japan Village - 204 km
Suzuyama Kagoshima Japan Village - 222 km
Yokura Kagoshima Japan Village - 222 km
Yanagatai Kagoshima Japan Village - 225 km
Sedo Kagoshima Japan Village - 225 km

see full list


Critical infrastructure

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

More information

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