The Earth is made up of three main layers - the core, mantle and crust. The crust is divided into tectonic plates that move and interact with each other, sometimes colliding, pulling apart or scraping together. When plates interact, they can cause deformation of the crust and the release of energy in the form of earthquakes, where the focus originates at a point within the Earth and seismic waves travel outward to the epicenter above the surface.

2. An earthquake is the vibration of Earth
produced by the rapid release of energy

3. Structure of the Earth
• The Earth is
made up of 3
main layers:
– Core
– Mantle
– Crust

5.  The Earth’s crust is divided into 12 major
plates which are moved in various
directions.
 This plate motion causes them to collide,
pull apart, or scrape against each other.
 The word, tectonic, refers to the
deformation of the crust as a consequence
of plate interaction.

6.  If you look at a map of the world, you may notice that some
of the continents could fit together like pieces of a puzzle.

8. PARTS OF AN EARTHQUAKE
• Focus is the point within Earth
where the earthquake starts.
•• Epicenter is the location on
the surface directly above the
focus.
•Faultsare fractures in Earth
where movement has occurred.

9.  Seismographs are instruments that record
earthquake waves.

10. Based on the amplitude of the largest seismic
wave