1970 Ancash earthquake

The earthquake affected an area of about 83,000 km², an area larger than Belgium and the Netherlands combined, in the north central coast and the Sierra (highlands) of the Ancash Region and southern La Libertad Region. Reports of damage and casualties came from Tumbes to Pisco and Iquitos in the east. Damage and panic scenes were reported in some parts of Ecuador. Tremors were also felt in western and central Brazil.

It was a system-wide disaster, affecting such a widespread area that the regional infrastructure of communications, commerce, and transportation was destroyed. Economic losses surpassed half a billion US dollars. Cities, towns, villages -- and homes, industries, public buildings, schools, electrical generation and distribution systems, water, sanitary and communications facilities -- were seriously damaged or were destroyed.

U.S. First Lady Pat Nixon led American aid efforts after the earthquake. She aided in taking relief supplies to earthquake victims (above) and visited children in hospitals (below).

Areas hard hit were the coastal towns and cities of Chimbote (the largest city in Ancash), Casma, Supe and Huarmey; but the Andean valley known as the Callejón de Huaylas suffered the most intense and sweeping damage, with the regional capital, Huaraz, and Caraz and Aija being partially destroyed. Trujillo, the country's third largest city, and Huarmey suffered minor damage.

In Chimbote, Carhuaz and Recuay, about 80% to 90% of buildings were destroyed, affecting about three million people.

The Pan-American highway was also damaged, which made the arrival of humanitarian aid difficult. The Cañón del Pato hydroelectricity generator was damaged by the Santa River and the railway connecting Chimbote with the Santa Valley was left unusable on 60% of its route.

The Peruvian government has forbidden excavation in the area where the town of Yungay is buried, declaring it a national cemetery. The children who survived in the oca stadium were resettled around the world. In 2000, the tragedy inspired the government to declare 31 May as Natural Disaster Education and Reflection Day.

Every 31 May, many schools of Peru practise an earthquake drill to commemorate this disaster.

The northern wall of Mount Huascarán was destabilized, causing a rock, ice and snow avalanche and burying the towns of Yungay and Ranrahirca. The avalanche started as a sliding mass of glacial ice and rock about 910 metres (2,990 ft) wide and 1.6 km (1 mile) long. It advanced about 18 kilometres (11 mi) to the village of Yungay at an average speed of 280 to 335 km per hour.[7] The fast-moving mass picked up glacial deposits and by the time it reached Yungay, it is estimated to have consisted of about 80 million m³ of water, mud, rocks and snow.

Yungay Viejo (2,500 m) as seen from the cemetery hill. The light shaded area shows the location of the landslide (ice, mud, debris avalanche), in which a part of the western flank of Huascaran Norte broke (6,652 m). Yungay Nuevo is behind the shaded area in the center.