A magnitude of 6.1 earthquake struck the Philippines' main island of Luzon on Monday killing eight people and injuring 20.
The quake hit 60 kilometres northwest of the capital, Manila, disrupting air, rail and road transport and causing some damage to buildings and infrastructure.
The Philippines is prone to natural disasters, located on the seismically active Pacific "Ring of Fire", a horse-shoe shaped band of volcanoes and fault lines that circles the edges of the Pacific Ocean. It is also hit by an average 20 typhoons a year, bringing heavy rains that trigger deadly landslides.
The USGS said the earthquake hit near Tutubigan, which is hundreds of kilometres south of the quake that hit near Manila.