Manila: A 5.2-magnitude earthquake struck south of Sarangani in the Philippines on Tuesday, according to the United States Geological Survey (USGS).The earthquake occurred at a depth of 10 kilometres, with its epicentre located approximately 92 kilometres south of Sarangani, the USGS said.There were no immediate reports of casualties or damage.The Philippines lies along the Pacific "Ring of Fire", a seismically active zone where earthquakes and volcanic activity occur frequently.