As shown in this visualization, based on a simulation created by Ángel Amores, a physical oceanographer at the Mediterranean Institute for Advanced Studies in Majorca, Spain, the shockwave took about 36 hours to circumnavigate the globe, spreading out in concentric rings from the volcano known as Hunga Tonga-Hunga Haʻapai and traveling at the speed of sound. The simulation was published in the journal Geophysical Research Letters in March.

Read more: ‘It’s Super Spectacular.’ See How the Tonga Volcano Unleashed a Once-in-a-Century Shockwave. - The New York Times (nytimes.com)