Maps: 7.2-Magnitude Earthquake Shakes PeruShake intensity Note: Map shows the area with a shake intensity of 4 or greater, which U.S.G.S. The New York TimesA major, 7.2-magnitude earthquake struck in the South Pacific Ocean off Peru on Friday, according to the United States Geological Survey. The temblor happened at 12:36 a.m. Peru time about 5 miles west of Atiquipa, Peru, data from the agency shows. Aftershocks are typically minor adjustments along the portion of a fault that slipped at the time of the initial earthquake. These events can be of equal or larger magnitude to the initial earthquake, and they can continue to affect already damaged locations.