The Strongest Earthquake in Recorded History: Valdivia 1960

On May 22, 1960, the ground beneath southern Chile moved in a way it had never moved in recorded history. The Valdivia earthquake reached a magnitude of 9.5. No earthquake before or since has been larger. But what happened that day, and in the days that followed, was not one disaster. It was a cascade. The people of Valdivia had already survived a major earthquake the day before. The authorities had assessed the situation. A decision had been made. And then May 22 arrived. What followed crossed the entire Pacific Ocean. It reached Hawaii. It reached Japan. It triggered a geological event in the mountains above Valdivia that put an entire city in a second kind of danger, one that had nothing to do with shaking or waves. And it exposed something about the instruments scientists used to measure earthquakes: a limit nobody had been forced to confront before. What came after that discovery changed how we understand the planet itself. The fault that caused all of this is not the only one of its kind. This is the full story of the largest earthquake ever recorded, the science, the decisions, and what it means for the coasts that sit above the same kind of fault today. Epicenter Files covers the geology, history, and human consequence of the Earth's most significant seismic events, the science behind what happened, and what it means for what comes next. Subscribe so you don't miss the next one.