On 23 June 2001 a major earthquake occurred at 20:33 UTC (3:33 pm local time) near the coast of southern Perú, 175 km west of Arequipa and 595 km southeast of Lima. The earthquake ruptured a portion of the plate boundary between the Pacific and Nazca Plates and produced ground shaking that was felt in much of southern Perú and northern Chile. It killed at least 57 people and destroyed or damaged more than 60,000 homes, affecting more than 223,000 people (USAID, 2001). The earthquake produced a tsunami that left an additional 24 people dead and 62 missing in the Camaná area (INDEC, 2001). This report summarizes the results of the first International Tsunami Survey Team (ITST) that surveyed the tsunami impacts two weeks after the earthquake and discusses the seismological characteristics of the earthquake that pertains to the tsunami.