Most earthquakes are under land. An earthquake is caused by tectonic plates shifting and/or colliding together.
If there is an earthquake under an ocean, tsunami is possible.
its always underground, the shock waves from the moving plates go up through the crust
shakes
A tsunami occurs
An earthquake on land can cause extensive damage and loss of life as buildings collapse. If the earthquake happens under the sea, a tsunami can form and destroy coastal areas and some way inland.
earthquakes under seafloor can lead to tsunamis
it get weak
tsunami,flooding
The plates in the earth collide and one goes under the other
pressure builds under the plates
What causes the tsunami is an earthquake under ground and it blows the water to land
If people are inside they are supposed to duck under tables to protect themselves.