There were no immediate reports of damage or injuries.
Civil defense official Jairo Goreau in the provincial capital of Pucallpa near the epicenter said some power outages were reported as well as telephone line congestion but city inspectors had so far encountered no damage.
The quake struck at 4:38 a.m. (9:38 GMT), 21 miles (34 kilometers) east of Pucallpa, a city of more than 270,000 people, at a depth of 89 miles (143 kilometers), according to the U.S. Geological Survey.
