The earthquake itself devastated towns across Peru's Ancash region, but its deadliest consequence was the collapse of a section of ice and rock from the north peak of Mount Huascarán. The mass descended roughly 3,000 metres, reaching estimated speeds above 200 km/h.
The resulting debris avalanche buried Yungay and Ranrahirca almost completely, killing an estimated 20,000 people in Yungay alone. Only around 400 residents survived, most of them people who ran uphill to the town cemetery.
The site is preserved today as a national memorial, with the buried town left untouched beneath the debris field.
Why this event still matters
Historical incidents shape the rules that protect people today — building codes, evacuation policy, warning systems and inspection regimes almost always trace back to a specific disaster. Studying Ancash Earthquake and Huascarán Avalanche alongside current events is how preparedness improves.
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