Stress in earths outer layer cause the fault to push, because of this rocks slip past each other releasing energy. the energy released goes in waves inside earths crust and cause the earth to shake meaning an earthquake. in the epicenter is were it happen on the surface so we feel it as it happens. using seismographs the earthquakes waves are measured to see how large thet got which the magnitude indicates. tsunamis are large waves that can cause many buildings to collapse due to their force. it happens on the focus which is the area where an earthquake begin underground. there are 3 types of waves L wave, S wave, P wave.
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