A moderate earthquake shook buildings in Peru's capital on Tuesday
but there were no reported injuries or damage, Reuters witnesses and safety officials said.
Peru's geological survey recorded a 5.6 magnitude quake, while the USGS said it measured 4.6 and was centered on the floor of the Pacific Ocean about 35 kilometers (21 miles) west of Lima.
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Quakes are frequent in Peru, with about 170 felt by people annually, according to the country's Geophysical Institute
. The same collision of tectonic plates responsible for the most powerful quake ever recorded, a magnitude-9.5 quake that hit Chile in 1960, occurs just off Lima's coast, where about 3 inches of oceanic crust slides annually beneath the continent.
A 7.5-magnitude quake in 1974 a day's drive from Lima in the Cordillera Blanca range killed about 70,000 people as landslides buried villages. Seventy-eight people died in the capital. In 2007, a 7.9-magnitude quake struck even closer, killing 596 people in the south-central coastal city of Pisco.
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