The August 24, 2018, M 7.1 earthquake near the Peru-Brazil border in southeast Peru occurred as the result of normal faulting at a depth of approximately 610 km. This earthquake occurred within the oceanic lithosphere of the subducted Nazca plate, almost 1,000 km east of the Peru-Chile Trench. Focal mechanism solutions indicate that rupture occurred on either a northwest or southeast-striking, moderately dipping normal fault. Slip on a fault of either orientation would accommodate the down-dip extension of the Nazca slab that is implied by the normal component of the faulting solution. At the location of the earthquake, the Nazca plate subducts to the east under the South America plate at a velocity of about 69 mm/yr.