
A century of great earthquakes
Every M7+ earthquake since 1900 from the USGS catalog: 1,618 events, 108 of them M8 or larger. Ring-of-fire choreography, per-chapter time windows, pulsing highlights on the four M9s (Kamchatka 1952, Valdivia 1960, Alaska 1964, Sumatra 2004, Tōhoku 2011) and a final chapter that extrudes magnitude into 3D columns.




