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In the late afternoon of June 23, 2001, a colossal earthquake with a magnitude of 8.4 MW took place in the coastal waters off the District of Arequipa and the town of Atico, Peru. The magnitude of the event made it the largest in the world in the previous 25 years. This earthquake caused nearly 2,000 deaths and 3,000 injuries; 26,000 homes were destroyed; 34,000 homes were damaged; and 190,000 people were left homeless. This report highlights results of a reconnaissance to investigate the damage and impacts to the various lifelines: water, railroads, highway systems, power systems, airports, and communications. The main geotechnical feature of this event was shaking induced landslides, rock falls, and subsidence associated with poorly compacted fills, steep cut slopes, and differential settlement at cut/fill interfaces.
