A 7.4-magnitude earthquake has struck off the southeastern coast of the Philippines, according to the US Geological Survey, with local authorities warning dangerous tsunami waves could be generated. The quake struck off the eastern side of Mindanao island, some 123 kilometers (79 miles) from the island's capital Davao, at a depth of 58.1 kilometers (36 miles), according to USGS. There were no immediate reports of damage.