Wanderlust World Wanderlust World Japan's Pacific coast sits on the Pacific Ring of Fire, where subduction zones (Japan Trench, Nankai Trough, Ryukyu Trench) generate megathrust earthquakes and tsunamis. These cities face the highest exposure:
2011 Tohoku tsunami devastated Sendai (run-up 10m+, 1,000+ deaths). Low-lying coastal plain + proximity to Japan Trench = extreme risk. Massive seawalls and evacuation towers now built.
37M metro population on lowlands at the head of Tokyo Bay. Nankai Trough** earthquakes (recurrence ~100–150 yr) can generate tsunamis entering the bay. Government models project 2m+ inundation in eastern wards. Extreme evacuation challenges.
On Ise Bay, directly exposed to Nankai Trough tsunamis. 1944 Tonankai and 1946 Nankaido quakes caused damaging waves. Industrial port density increases economic risk.
Osaka Bay funnels Nankai Trough tsunamis. 1707 Hoei tsunami killed thousands. Dense urban/industrial zone; massive seawall/gate systems (e.g., Osaka Bay Phoenix Project) constructed.
Faces Ryukyu Trench. 1914 Sakurajima eruption triggered tsunami; frequent seismic activity. Volcanic + tectonic dual hazard.
No Japanese Pacific city is immune, but these five combine high hazard, dense population, and critical infrastructure—making them the focus of national disaster planning.