In 1883, the volcanic island of Krakatoa erupted in Indonesia. The blast destroyed two-thirds of the island and sent 130-foot-high waves surging across the Indian Ocean, killing 36,500 people from Indonesia to India.
According to the US National Geophysical Data Center, an air pressure wave from the blast traveled around the Earth seven times.
“Small sea level oscillations from Krakatau's major explosion and collapse were observed or recorded by tide gauges around the world, as far away as Hawaii, the American West Coast, South America, and even as far away as the English Channel in France and England," Dr. George Pararas-Carayannis wrote in a research paper on the tsunami.