Two major magnitude 7.6 earthquakes have struck the Peruvian-Brazilian border in the Amazon basin within minutes of each other with no immediate reports of damage, the US Geological Survey says.
Damage from Tuesday's quakes is likely to be limited as the epicentre was deep in the Amazonian jungle, around 296 kilometres northwest of the Peruvian town of Puerto Maldonado, in a sparsely populated area.
Both quakes were also very deep, around 602kms below ground.
The quakes, which struck at 2245 GMT (0945 AEDT) and then five minutes later, were felt by residents in northern Chile, the Brazilian city of Brasileia and Peru's capital, Lima, 681kms to the east.
They were located inland and there was no risk of a Pacific tsunami, authorities said.
"At this point there is no reported damage," the head of Peru's emergency services, Alfredo Murgueytio said.
Fire department chief in the border state of Acre in Brazil, Coronel Carlos Gondim, also said there had been no reports of any damage or casualties.
Mining as well as oil and gas companies in the area reported operations functioning normally.
Peru, the world number three copper producer, is located on the Pacific 'Ring of Fire' and earthquakes are a fairly regular occurrence.
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