Floods and Tsunamis
crashing into in the water from space. Most tsunamis are caused by
underwater earthquakes, but not all underwater earthquakes cause
tsunamis - an earthquake has to be over about magnitude 6.75 on the
Richter scale for it to cause a tsunami. About 90 percent of all tsunamis
occur in the Pacific Ocean.
Many tsunamis could be detected before they hit land, and the loss of
life could be minimized, with the use of modern technology, including
seismographs (which detect earthquakes), computerized offshore buoys
that can measure changes in wave height, and a system of sirens on the
beach to alert people of potential tsunami danger.
annaabi.ee 
