The Orphan Tsunami: Unearthing the 1700 Cascadia Megathrust

In January 1700, a massive tsunami struck the eastern coast of Japan, wiping out coastal villages and destroying rice paddies. The Japanese meticulously recorded the damage in their feudal ledgers, but they noted something terrifying: no earthquake had been felt. They called it an "orphan tsunami." For three centuries, the source of this rogue wave remained a geological mystery. This book delves into the brilliant forensic seismology that finally solved the puzzle. By analyzing "ghost forests"—stands of dead, salt-bleached cedar trees along the coast of Oregon and Washington—scientists used dendrochronology (tree-ring dating) to prove that the entire coastline had suddenly dropped several feet into the ocean exactly in the winter of 1699-1700. We explore how Native American oral traditions of epic battles between thunderbirds and whales flawlessly matched the physical evidence of a massive Magnitude 9.0 megathrust earthquake on the Cascadia Subduction Zone, a fault line that had violently unzipped and sent an apocalyptic wave racing across the entire Pacific Ocean. Connect the clues across the ocean. Discover how scientists merged ancient Japanese tax records with dead American trees to prove the existence of a sleeping geological monster.