The Earth’s surface isn’t a giant shell, it has cracks that fits together like a puzzle. An earthquake happens when one of these giant piece moves, which are not predictable, but understandable why it happens by scientists.
The Earth's outmost layer, the crust, has pieces called tectonic plates. The edge between them are called plate boundaries, the boundaries have many faults. Changes in the deepest layers make the plates move and rumble, that creates an earthquake.
Due to the deepness of the faults, scientists can’t measure how they change, so geologists measure the seismic energy if an earthquake using a seismograph. They classify earthquake’s magnitude using the Richter Scale.
Scientists predict where the earthquake will occur by placing seismograph in fault zones and counting small earthquakes that we can’t fell. When several small quakes happen frequently, geologists know they should prepare for a larger one.
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