LESSON 4.1 | EARTHQUAKE HAZARDS, PREPAREDNESS AND RISK REDUCTION

Earthquake

• is the perceptible shaking of the surface of the Earth.

• is a weak or violent shaking of the earth’s surfaced caused by the sudden movement of rock materials beneath it.

• feeble shaking to violent trembling of the ground produced by the sudden displacement of rocks or rock materials below the earth’s surface

Focus

• is the point within Earth where the earthquake starts.

Epicenter

• is the location on the surface directly above the focus.

Faults

• are fractures in Earth where movement has occurred.

Foreshock

• is a small earthquake that often precedes a major earthquake.

Aftershock

• a small earthquake that follows the main earthquake.