There were no reports of damage or injuries anywhere around the remote epicenter.
The U.S. Geological Survey said the quake was centered 58 miles (93 km) north of Pucallpa, the capital of Ucayali province, and occurred at 4:00 p.m. local time.
Last year, southern Peru was rocked by a quake registering a magnitude of 8.0, which killed about 500 people and left more than 100,000 others homeless.