This volcano remnant was not dormant, however, and in August 1883 the volcano on Krakatau erupted with such violence that the sound was heard as far away as Madagscar and Alice Springs, thousands of kilometers away. Two-thirds of the island was destroyed and roughly 20 cubic kilometers of rock was lofted into the atmosphere. It was one of the largest explosions on Earth in recorded history. The eruption also raised a tsunami 40 meters (130 feet) high which resulted in an estimated 36,000 deaths when it washed ashore as much as 10 kilometers inland from the coast of nearby islands. Since 1927, continued eruptions and outflow material has formed the fourth island in the park, Anak Krakatau—“Child of Krakatau.