Loading data for JapanLining up the latest figures for all 47 prefecturesPulling together quakes, weather, and live camerasBuilding the map layers
Annual count of earthquakes recording seismic intensity 4+ within the prefecture. A composite metric (seismic activity + observation-network density) that also reflects differences in network density.
Source: JMA — Seismic Intensity Database + Nippon Pulse earthquake observation archive
▲ The top 5 prefectures are tinted sky, ▼ the bottom 5 amber — just enough colour to follow the two ends of the “desirable direction.”
To see the same metric on the map, pick it from the map on the home page.