A series of four strong earthquakes spanning just over an hour struck the Philippines' Moro Gulf on Saturday morning, according to the U.S. Geological Survey.

Three of the four earthquakes had magnitudes between 7.3 and 7.6; the other came in at a 5.4 magnitude. The first quake struck at 6:08 a.m. (6:08 p.m. ET Friday) and the fourth hit at 7:15 a.m. The last quake ran the deepest at 616 (382 miles) kilometers.

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