Definition of earth quakes - SS3 Geography Lesson Note

An earthquake is a natural phenomenon that occurs when there is a sudden release of energy in the Earth's crust, causing the ground to shake or tremble. It is often referred to as a "seismic event."

The origin of an earthquake is the point inside the Earth where the sudden release of energy, also known as the earthquake's focus or hypocenter, takes place. This is usually deep within the Earth's crust.

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Tremor:

A tremor is another word for the shaking or trembling of the ground during an earthquake. It's the result of the energy released from the earthquake's origin propagating through the Earth.

Epicenter:

The epicenter is the point on the Earth's surface directly above the earthquake's origin or hypocenter. It's where the shaking is typically the strongest during an earthquake.

Shock Waves:

Shock waves are the intense waves of energy that radiate outward from the earthquake's focus. These waves cause the ground to shake and can lead to damage and destruction. There are two main types of seismic waves: P-waves (Primary waves) and S-waves (Secondary waves), which are responsible for most of the shaking during an earthquake.