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WHAT IMPACT DO EARTHQUAKES HAVE ON OUR LIVES?. WHAT IS A WAVE? Wave: Transference of energy Wave: Transference of energy P Wave (longitudinal): A primary.

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Presentation on theme: "WHAT IMPACT DO EARTHQUAKES HAVE ON OUR LIVES?. WHAT IS A WAVE? Wave: Transference of energy Wave: Transference of energy P Wave (longitudinal): A primary."— Presentation transcript:

1 WHAT IMPACT DO EARTHQUAKES HAVE ON OUR LIVES?

2 WHAT IS A WAVE? Wave: Transference of energy Wave: Transference of energy P Wave (longitudinal): A primary wave vibrates parallel to direction of movement P Wave (longitudinal): A primary wave vibrates parallel to direction of movement S Wave (transverse): A secondary wave vibrates perpendicular to the direction it advances S Wave (transverse): A secondary wave vibrates perpendicular to the direction it advances L Wave: When S and P waves reach surface and cause horizontal movement of earth L Wave: When S and P waves reach surface and cause horizontal movement of earth

3 WHAT CAUSES EARTHQUAKES? EARTHQUAKES Movement of plates cause stress and tension to build up Movement of plates cause stress and tension to build up Focus: Location inside earth where earthquake originates also called hypocenter Focus: Location inside earth where earthquake originates also called hypocenter Epicenter: Point on earths surface directly above focus Epicenter: Point on earths surface directly above focus Shadow zone: Area on earth where there are no waves, caused by the inner core Shadow zone: Area on earth where there are no waves, caused by the inner core

4 HOW DO WE DETERMINE THE LOCATION OF THE EPICENTER? Seismograph: Instrument that measures earthquakes Seismograph: Instrument that measures earthquakes Seismograph Need three seismograph readings to determine the location Need three seismograph readings to determine the location

5 HOW DO WE MEASURE EARTHQUAKES? Richter Scale: Measures magnitude or power of earthquake Richter Scale: Measures magnitude or power of earthquake

6 Mercalli Scale: Measures Intensity

7 What are the major types of faults? Normal Fault: divergent boundary, caused by tension Normal Fault: divergent boundary, caused by tension Thrust (reverse) Fault: convergent boundary, caused by compression Thrust (reverse) Fault: convergent boundary, caused by compression Strike-Slip Fault: Transform boundary, caused by shear Strike-Slip Fault: Transform boundary, caused by shear

8 What factors play a role in the amount of damage caused by an earthquake? Magnitude Magnitude Location of the epicenter Location of the epicenter Man made structures Man made structures

9 What are some safety tips for home/school? Secure large standing cabinets Secure large standing cabinets Place safety locks on kitchen cabinets Place safety locks on kitchen cabinets Secure gas pipes Secure gas pipes Have a main shut off for gas/electric Have a main shut off for gas/electric Do not place loose items high on shelves Do not place loose items high on shelves


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