Japan: Earthquake: 2026/04/20

Period	2026/04/20
Country or District	Japan
Event Type	Earthquake
Outline	A tsunami warning, with waves of up to 3 meters forecast, was issued Monday evening of 20 April 2026 for Iwate and Aomori prefectures and Hokkaido in northern Japan after a M7.5 (later modified to M7.7) powerful quake struck off the coast of Iwate.

Related Links

Report/Articles

NHK World 2026/04/27
Japan's Meteorological Agency has ended an advisory for a potential megaquake in the northeastern part of the country as of 5 p.m. Japan time on Monday, 27 April 2026.

NHK World 2026/04/21
The Japan Meteorological Agency has issued an alert for a potential mega quake, following the magnitude 7.7 quake on Monday. The agency says residents in 182 municipalities in the prefectures of Hokkaido, Aomori, Iwate, Miyagi, Fukushima, Ibaraki, and Chiba should prepare for disaster and listen for any updates.

Cabinet Office 2026/04/20
Issuing the ”Off the Coast of Hokkaido and Sanriku Subsequent Earthquake Advisory" (Japanese only)

NHK World: 2026/04/20
The government says over 171,957 residents in Hokkaido, Aomori, Iwate, Miyagi and Fukushima prefectures had been ordered to evacuate as of 6:45 p.m. on Monday. Also alert for potential mega-quake has been issued.

The Japan Times 2026/04/20
Tsunami hit Iwate, Aomori and Hokkaido after powerful quake

Geographycal Data

JMA 2026/04/20
Date and Time: 2026/04/20 16:53 (local time), Magunitude: 7.5, Epicenter: Off the Coast of Sanriku, Depth: 10km