Why Don T All Earthquakes Underwater Create Tsunamis?
Why Don T All Earthquakes Underwater Create Tsunamis? So why do some submarine earthquakes cause tsunamis but others do not? First, the quakes have to be sufficiently large. Noticeable tsunamis require earthquakes of about magnitude seven or larger and widely-damaging tsunamis usually require earthquake magnitudes of at least eight or greater. Do offshore earthquakes always