What is an Eathquake
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Answer:
A pencil is brittle yet it is also elastic when you try to bend it a little. The rigid outer part of the Earth, called the lithosphere, is also brittle yet elastic. Both the pencil and the lithosphere are capable of storing energy and rebounding elastically, but both are also capable of breaking and releasing the stored energy in the form of vibrations and sound. This release of stored energy in the Earth as one rock surface moves against another is called an earthquake.
Crustal Stress
Movements within the Earth’s crust cause stress to build up at points of weakness, and rocks to deform. When the stress finally exceeds the strength of the rock, the rock fractures along a fault, often at a zone of existing weakness within the rock.
Earthquake Waves Spread Out
Vibrational energy is produced when rocks break; the energy spreads out in all directions like ripples on a pond. The shock waves radiate out from the point where the rocks first begin to break; this point is called the focus or hypocentre of the earthquake. The energy is dissipated as the shaking we call an earthquake.
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