The 1970 Ancash earthquake was a severe undersea earthquake that affected the Peruvian region of Ancash, killing at least 50,000 people. Combined with a subsequent landslide, it was the most catastrophic natural disaster ever recorded in the history of Peru. The quake destabilized part of Mount Huascarán, an extinct volcano and Peru's highest mountain, triggering a rock and snow avalanche that buried the towns of Yungay and Ranrahirca. What was the magnitude of the earthquake? Discuss (http://forum.thefreedictionary.com/postst59814_The-Ancash-Earthquake--1970-.aspx)