Circle size scales exponentially with magnitude (M).
Formula: size = 1.8M × 3
M7 appears ~3x larger than M5.
Cyan: M4.5-5 (Moderate)
Yellow: M5-6 (Strong)
Red: M6+ (Major)
Sound plays when earthquakes occur.
Volume: Louder for higher magnitude
Pitch: Lower for higher magnitude
USGS Earthquake Hazards Program
Coverage: Worldwide
Minimum Magnitude: M4.5+
Update: Daily
Map Tiles: Esri
enepen
: エネルギー・金融・データ可視化のツール集
SEISMIC JP
: 日本の地震可視化マップ