Japan Meteorological Agency seismic intensity scale - Wikipedia

2011 Tōhoku earthquake and tsunami - Wikipedia

Magnitude 6.1 earthquake hits northern Japan, no tsunami warning

2011 Tōhoku earthquake and tsunami - Wikipedia

2005 Fukuoka earthquake - Wikiwand

File:Shindo observation density comparison - 1978 Miyagi-oki earthquake.png - Wikimedia Commons

Reconnaissance report on geotechnical damage caused by 2018 Hokkaido Eastern Iburi earthquake with JMA seismic intensity 7 - ScienceDirect

2011 Tōhoku earthquake and tsunami - Wikipedia

Outline of the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0) — Earthquake Early Warning and observed seismic intensity—, Earth, Planets and Space

List of earthquakes in Japan - Wikipedia

Earthquake Early Warning (Japan) - Wikipedia