What causes Earth to shake? Earth 's crust is made of about 12 blocks, of rock called tectonic plates sitting on, a layer. Of hot molten rock. Most earthquakes occur where two plates meet. Pressure builds up as the plates try to slide under over,,, Or past each other. At, some point the plates move into a position that results in an earthquake. Some quakes are so mild. That they can ', t be feltAnd others shake the, ground violently destroying roads and buildings. The vibrations called seismic waues travel both,,, On and below Earth 's surface. The type of area they travel through influences how much destruction the waves cause.
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