The explosions were so violent that they were heard 3,500 km (~2200 mi) away in Perth, Western Australia and the island of Rodrigues near Mauritius, 4,800 km (~3000 mi) away; the sound of Krakatoa's destruction is the loudest sound in recorded history, reaching levels of 180 dBSPL 100 miles (160 km) away.[8]. The pressure wave from the final explosion was recorded on barographs around the world, which continued to register it up to 5 days after the explosion. The recordings show that the shockwave from the final explosion reverberated around the globe 7 times in total.[9] Ash was propelled to a height of 80 km. The eruptions diminished rapidly after that point, and by the morning of August 28 Krakatoa was quiet.