A magnitude-6.6 earthquake struck south of Tokyo at 7:49 a.m. local time today, the Japan Meteorological Agency said, the third temblor to rock the Japanese capital since Aug. 9.

The earthquake hit 312 kilometers (186 miles) south of Tokyo at a depth of 57 kilometers, shaking buildings in the capital, the weather agency said on its Web site. There were no reports of injuries or damage.

A magnitude-6.5 earthquake to the southwest of Tokyo two days ago left one person dead, 123 people injured and damaged 5,192 houses, according to Japan's Fire and Disaster Management Agency. A magnitude-6.9 quake struck to the west of today's quake on Aug. 9.

An aftershock from was recorded at 10:53 a.m. today with a magnitude of 4.9, the JMA said.

Today's quake may have generated a local tsunami, U.S. Pacific Tsunami Warning Center said. There was no warning from the Japanese agency and no tsunami was recorded. The U.S. Geological Survey said on its Web site the quake had a magnitude of 6.7.