Situated on the western fringes of the Pacific [[Ring of Fire]], the Philippines experiences frequent seismic and volcanic activity. The [[Benham Plateau]] to the east in the Philippine Sea is an undersea region active in [[Plate tectonics|tectonic]] [[subduction]]. Around 20 [[earthquake]]s are registered daily, though most are too weak to be felt. The last major earthquake was the [[1990 Luzon earthquake]]. There are [[List of active volcanoes in the Philippines|many active volcanoes]] such as the [[Mayon Volcano]], [[Mount Pinatubo]], and [[Taal Volcano]]. The eruption of Mount Pinatubo in June 1991 produced the second largest terrestrial eruption of the 20th century. The Philippines is the world's second-biggest [[geothermal energy]] producer behind the United States, with 18% of [[Energy in the Philippines|the country's electricity]] needs being met by geothermal power.