The exact point inside the crust where tremendous amount of energy actually starts to be released.

A tool used by seismologists to measure, detect and record the strength and duration of vibrations.

A seismic wave under water.

Refers to a measure of energy released after an earthquake.

intensity is controlled by three main factors

This waves is also known as compressional waves or longitudinal waves.

These waves can only penetrate the solid materials and so they stop at the liquid layer of Earth.

These waves move the ground horizontally, causing it to twist from side to side.

These waves exist at any free surface in a continuous body moving in a rolling motion.

These waves originate from the focus and can travel through Earth's interior.

These waves are usually generated when the source of earthquake is from shallow focus or near the Earth's surface.

Body waves and surface waves travel in different layers of the earth.

Aftershocks can cause bigger damage than the main shock.

The occurrence of earthquakes cannot be predicted accurately.