An earthquake is the sudden movement of the Earth's crust caused by rock that is stuck together slipping suddenly. The epicenter is where the slipping rock begins and is the point where seismic waves start spreading out. Earthquakes typically occur along tectonic plate boundaries. An earthquake is measured on the Richter scale based on the magnitude of energy released at the epicenter, while the Mercalli scale measures the effects felt by people.

1. Earthquakes

2. What is an earthquake

3. What is an earthquake
Earthquake: Sudden movement of the Earth’s crust

4. What is an earthquake
Earthquake: Sudden movement of the Earth’s crust
Earthquakes occur when rock that is stuck together
suddenly slips

5. What is an earthquake
Earthquake: Sudden movement of the Earth’s crust
Earthquakes occur when rock that is stuck together
suddenly slips
FOCUS: Where the slipping rock begins

6. What is an earthquake
Earthquake: Sudden movement of the Earth’s crust
Earthquakes occur when rock that is stuck together
suddenly slips
FOCUS: Where the slipping rock begins
EPICENTER: Point on earth’s surface where waves
start spreading out

7. What is an earthquake
Earthquake: Sudden movement of the Earth’s crust
Earthquakes occur when rock that is stuck together
suddenly slips
FOCUS: Where the slipping rock begins
EPICENTER: Point on earth’s surface where waves
start spreading out
Earthquakes happen along boundaries of tectonic
plates

8. What waves do Earthquakes make

9. What waves do Earthquakes make
Seismometer: Is an instrument that detects and
measures waves produced by an earthquake

10. What waves do Earthquakes make
Seismometer: Is an instrument that detects and
measures waves produced by an earthquake
Three types of Waves:
P Waves: Primary waves: fastest, and they travel
through both solid and liquids
S Waves: Secondary Waves: Move only through
solids
Surface Waves: Slowest moving waves, and travel
along earths surface and cause damag

11. How is an earthquakes energy measured

12. How is an earthquakes energy measured
Magnitude: This is the measure of the amount
of energy released by an earthquake

13. How is an earthquakes energy measured
Magnitude: This is the measure of the amount
of energy released by an earthquake
Richter Scale measures magnitude at the
epicenter

14. How is an earthquakes energy measured
Magnitude: This is the measure of the amount
of energy released by an earthquake
Richter Scale measures magnitude at the
epicenter
Mercalli scale measures what people feel

15. How is an earthquakes energy measured
Magnitude: This is the measure of the amount
of energy released by an earthquake
Richter Scale measures magnitude at the
epicenter
Mercalli scale measures what people feel
Aftershocks: Earthquakes with lesser magnitude

16. Tsunamis

17. Tsunamis
Earthquakes that occur underwater cause these

18. Tsunamis
Earthquakes that occur underwater cause these
Tsunamis are huge waves that are produced by
the earthquakes

19. Tsunamis
Earthquakes that occur underwater cause these
Tsunamis are huge waves that are produced by
the earthquakes
Tsunamis only happen after a 6.5 or larger
earthquake occur

20. How can people prepare

21. How can people prepare
New construction methods

22. How can people prepare
New construction methods
Rubber and steel between building and
foundation