Three earthquakes of greater than magnitude 7 struck the Philippines' Moro Gulf in just over an hour early Saturday, according to the U.S. Geological Survey.

The first quake, magnitude 7.3, was recorded at 6:08 a.m. (5:08 p.m. ET Friday); the second, 7.6 magnitude at 6:51 a.m. (5:51 p.m. ET); the third, magnitude 7.4, at 7:15 a.m. (6:15 p.m. ET).

The USGS also recorded a 5.4-magnitude quake at 6:19 a.m. (5:19 p.m. ET)

The last quake ran the deepest at 616 (382 miles) kilometers.

The epicenters of the quakes were about 100 kilometers (62 miles) off the coastal city of Cotabato and roughly 950 kilometers (590 miles) southeast of Manila.

No tsunami warning was immediately issued for any of the quakes.

There were no reports of damage, said Rona Faeldin of the Philippines Coast Guard.

- CNN's Katy Byron contributed to this report.