M 5.4 in Japan on 21 Apr 2026 05:29 UTC

Event summary

This earthquake can have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

GDACS ID EQ 1536595
Earthquake Magnitude: 5.4M
Depth: 10 Km
Lat/Lon: 39.8481 , 143.6273
Event Date: 21 Apr 2026 05:29 UTC
21 Apr 2026 15:29 Local
Exposed Population: 540 thousand in MMI III
Inserted at: 21 Apr 2026 05:50 UTC
INFORM Coping capacity:
1.1 (Japan)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 GDACS score
NEIC 0 0
us6000srs6 Scaled population (raster) 0  
  C1 shakemap 0  
  C2 shakemap 0  
  Country Vulnerability 0  
  INFORM_normalised 0  
Maximum expected impact using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Detailed event map. European Union, 2026. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

Updates on volcanic activity (Smithsonian)

Latest media headlines

Today''s Top 3 News: Tsunami Threat Eases After Powerful 7.7 Earthquak.. 4/21/2026 11:04:00 AM.

TEMPO.CO, Jakarta Tempo English compiled the top 3 news on Tuesday, April 21, 2026. Here are the highlights: Tsunami Threat Eases After Powerful 7.7 Earthquake in Japan; Navy Confirms US Warship in Malacca Strait Amid Iran Tensions; and Tim
...(more)
Terremoto di magnitudo 7.5: scatta l’allerta tsunami 4/21/2026 11:01:00 AM.

CRONACA - La terra ha tremato violentemente nel nord-est del Giappone , dove un sisma di magnitudo 7.5 ha colpito la regione del Tohoku nel tardo pomeriggio locale. Il movimento tellurico, originatosi in mare a circa 10 chilometri di profon
...(more)
Japan revises magnitude of earthquake to 7.7 as tsunami threat looms 4/21/2026 10:56:00 AM.

Japanese officials have warned that a second tsunami may be approaching the country’s northeast coast following a powerful earthquake, the magnitude of which has been revised upward to 7.7. The Japan Meteorological Agency originally reporte
...(more)
Japan quake may disrupt semiconductor supply chain, hit NAND and photo.. 4/21/2026 10:51:00 AM.

April 21, 2026 / SemiMedia / — A strong earthquake off Japan’s northeast coast on April 20 has raised concerns about potential disruption to the semiconductor supply chain, with several key facilities halting operations for safety checks. T
...(more)

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (48), NEIC (4), OCHA (1), WMO (1), USGS (5), (2), INFORM (2),