Damage from a flood wave near Huallanca, Ancash region, Peru, caused by the 1970 Ancash earthquake. The wave, which was 20 metres deep at this point has swept away the homes that were on the level area. The bending of the poles shows the direction of the wave. The earthquake, also known as the Great Peruvian earthquake, struck 35 kilometres off the coast of Peru on the afternoon of the 31st May 1970. The earthquake had a magnitude of 7.9 and triggered a number of landslides, including an avalanche from Peru's highest mountain Mount Huascaran. It was the worst natural disaster in Peru's history, causing widespread destruction and killing approximately 70,000 people and injuring a further 150,000.