2. Earthquake-sudden movement of the ground caused by the release of energy when the rocks move along a fault. Fault-a break in rock where movement occurs. WHAT ARE EARTHQUAKES? © Associated Newspapers, Inc.

3. Most earthquakes occur at plate boundaries, where there is a lot of stress. -Some happen at fault zones WHERE DO MOST EARTHQUAKES OCCUR? ©2016 Geological Society of America

4. Focus-where the first movement occurs in the earth’s crust. Epicenter-point on the earth’s surface where the earthquake is felt first. ANATOMY OF AN EARTHQUAKE ©2011 http://www.mrsciguy.com/EarthScience/eq.html

5. Body waves-travel thru the earth’s interior. -P waves-primary ·Fastest waves, first to be detected. ·Move back and forth parallel to the motion of the wave. ·Move thru solids, liquids and gases. SEISMIC WAVES

6. -S waves-secondary ·Second fastest ·Move perpendicular to motion of wave. ·Move only thru solids SEISMIC WAVES

7. -Surface waves-travel along the earth’s surface. ·Slowest moving waves ·Move rock side to side and up and down ·Cause the most damage during earthquakes SEISMIC WAVES

8. ©2016 http://www.coolgeography.co.uk/GCSE/AQA/Restless%20Earth/Earthquakes/Earthquakes%20background.htm

9. ©2016 http://lifeng.lamost.org/courses/astrotoday/CHAISSON/AT307/HTML/AT30703.HTM

10. SEISMOLOGY Seismology is the study of earthquakes. Seismograph- instrument that records seismic waves. ©2016 http://www.iris.edu/hq/inclass/animation/seismograph_horizontal

11. Magnitude-strength of an earthquake. Richter scale Intensity-how much damage an earthquake causes. Mercalli scale MEASURING EARTHQUAKES

12. ©2015 https://en.wikipedia.org/wiki/Richter_magnitude_scale

13. ©2016 http://www.sms-tsunami-warning.com/pages/mercalli-scale#.VsYaXPk4Hcs

14. 1.Where do most earthquakes occur? 2.The ______is the point in the crust where movement occurs first. 3.______ waves can travel through the earth’s interior. 4._______ waves move perpendicular to the motion of the wave. 5._______ waves can move through solids, liquids and gases. 6._______ waves cause the most damage during earthquakes. 7._______is the study of earthquakes. 8.The Richter Scale measures the _______ of an earthquake. EARTHQUAKES QUIZ