The movement of the tectonic plates causes earthquakes. Nearly all of the convergent plate boundaries on the planet are located in the oceans, because the bending of oceanic plates into subduction zones causes the surface of the crust to be pulled down to several miles (several km) depth. most of the largest earthquakes occur along convergent plate boundaries when large amounts of crust move at one time. The sudden movement of the seafloor must move huge volumes of water, and this displacement of water is what causes many tsunamis.
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Disasters: Why No ones Really 100 Safe. This is common knowledgethat disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.