M 5.6 in Japan on 18 Apr 2021 00:29 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: 5.6M
Depth: 31.29 Km
Lat/Lon: 38.2705 , 141.8347
Event Date: 18 Apr 2021 00:29 UTC
18 Apr 2021 09:29 Local
Exposed Population: 2290000 people within 100km
Source: NEIC us6000e2hf
Inserted at: 18 Apr 2021 06:23 UTC
INFORM Coping capacity of the alert score: 1.5 (Japan)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us6000e2hf Scaled population (raster) 0  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 0.57  
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
1370652 0 18 Apr 2021 00:29 5.6M, 51.69km 3.73 N/A (in MMI>=VII) 00:18 NEIC
1370719 0 18 Apr 2021 00:29 5.6M, 31.29km 4.01 N/A (in MMI>=VII) 05:54 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 Tohoku (population 259,548) . 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 1370652 38.358/141.907 5.6 51.7 3.734 18 Apr 2021 00:51 00:22 (new episode)
2 0 1370652 38.358/141.907 5.6 51.7 3.734 18 Apr 2021 02:34 02:04 (upd of #1)
3 0 1370719 38.27/141.835 5.6 31.3 4.011 18 Apr 2021 06:29 05:59 (new episode)
4 0 1370719 38.27/141.835 5.6 31.3 4.011 19 Apr 2021 00:34 1d 00:05 (upd of #3)

Affected Provinces

Intensity Region Province Country Population
Tohoku Japan 260000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Niiyama Miyagi Japan Village - 27 km
Oshika Miyagi Japan Village - 28 km
Aji Miyagi Japan Village - 32 km
Oharahama Miyagi Japan Village - 32 km
Yagawa Miyagi Japan Village - 32 km
Nitoda Miyagi Japan Village - 37 km
Onagawahama Miyagi Japan Village - 39 km
Ohama Miyagi Japan Village - 40 km
Ogatsu Miyagi Japan Village - 41 km
Watanoha Miyagi Japan Village - 45 km
Tsukihama Miyagi Japan Village - 47 km
Nagatsura Miyagi Japan Village - 47 km
Terahama Miyagi Japan Village - 49 km
Ishinomaki Miyagi Japan City 120000 people 50 km
Iinogawa Miyagi Japan Village - 53 km
Kamata Miyagi Japan Village - 53 km
Shizugawa Miyagi Japan Village - 56 km
Isatomae Miyagi Japan Village - 56 km
Minato Miyagi Japan Village - 58 km
Shinden Miyagi Japan Village - 59 km
Yanaizu Miyagi Japan Village - 59 km
Takagi Miyagi Japan Village - 61 km
Wabuchi Miyagi Japan Village - 61 km
Kamimachi Miyagi Japan Village - 62 km
Motoyoshi Miyagi Japan Village - 64 km
Oyanagi Miyagi Japan Village - 67 km
Wakuya Miyagi Japan City 18000 people 67 km
Hirawata Miyagi Japan Village - 68 km
Nishino Miyagi Japan Village - 68 km
Sanuma Miyagi Japan City - 72 km

see full list


Critical infrastructure

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

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Matsushima 2 Civ. Paved Yes 8800 56 km

Ports

Intensity Name LOCODE Country Distance
Onagawa JPONG Japan 39 km
Ishinomaki JPISM Japan 48 km

Nuclear plants

Intensity Name Country Reactors Distance
ONAGAWA JAPAN 3 33 km

More information

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