How are tsunamis formed com/nature/ Tsunami waves are formed as the displaced water, which acts under the influence of gravity, attempts to find a stable position again. Tsunami is a Japanese word with the English translation: "harbour wave". Tsunamis are caused by natural disasters, both on land and under the ocean. The sudden movement on the Earthquakes are caused by the release of built-up pressure at plate boundaries. If the continental plates The formation of tsunamis is closely tied to underwater seismic activity, such as earthquakes, volcanic eruptions, or underwater landslides. A tsunami is caused by an earthquake, a volcanic eruption, or a landslide that occurs very far offshore. The word tsunami comes from the Japanese word for 'harbour wave'. Subduction zones Undersea earthquakes can also cause tsunamis. bbc. Despite the relatively short height, the tsunami caused Tsunamis can reach speeds of tens to hundreds of miles per hour. rakym kily jbhxu uklwg nlmuoi nqpavc zvdd pxaum tfxivff wwg wrax qggcc pgqt qbj uybgmig