EARTHQUAKE

EARTHQUAKE

WHAT IS AN EARTHQUAKE?

• In simple words, earthquake means the shaking of earth/ land.
• It is a natural hazard.
• Seismograph is used to measure earthquakes.

WHAT ARE THE CAUSES OF EARTHQUAKES?

• The occurrence of a severe earthquakes is limited to few regions of the world.
• These are caused due to the tectonic movements of the earth.
• The energy released forces waves to travel in all directions.
• The point where energy is released is called the Focus.
• The point on the earth, vertically above the focus is called the Epicentre.
                               

WHAT ARE THE TYPES OF EARTHQUAKES?

1. Tectonic earthquakes: It is most common and caused by the movement of tectonic plates on the earth’s crust.
2. Explosion earthquakes: Artificial factors like high density nuclear explosions are its primary causes.
3. Volcanic earthquake: Earthquakes produced by stress in rocks due to the withdrawal of magma.
4. Collapse earthquake: This type occurs in underground mines due to the pressure generated within the rocks.

WHERE ARE EARTHQUAKES LOCATED?

WHAT ARE THE AFTER EFFECTS OF EARTHQUAKE?

Earthquake can cause heavy damage to the life of people and surrounding environment.

The hazardous effects of earthquake as follows:

• Shaking of ground
• Changes in ground settlement
• Natural disasters -Tsunami, landslides, avalanches etc.
• Ground lurching
• Ground displacement
• Floods and levee failures
• Infrastructure collapse.
• Fires