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# Y8 Wk 34 Earthquakes 34

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acep, science, earthquakes

acep, science, earthquakes

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### Transcript

• 1. Textbook: Dynamic Earth Pages 240 – 245 Edmodo: Folders, Week 34
• 2.  Earthquakes are…: VIDEO * Note in the video they say “Hypocenter”. In the book, it is called the “Focus”. On the exam, FOCUS will be used. …ground movements. They happen when blocks of rock (tectonic plates) move suddenly and release energy.  The energy released is known as SEISMIC WAVES.
• 3.  There are 2 main types of seismic waves. VIDEO here.  P waves: Primary Waves  They are the first waves felt during an earthquake  They are faster than S waves  They move objects left to right  S waves: Secondary waves  They are stronger than P waves  They move slower so are felt later  The particles on the Earth move at right angles to the direction the wave is moving.
• 4.  Focus  In the earth, along a fault, where the earthquake begins.  Epicenter  Above the focus on the Earth’s surface is the epicenter.  Seismic waves flow out from the focus in all directions
• 5.  They occur near tectonic plate boundaries  As the plates move, pressure builds up near the edges. If there is too much pressure, the plates move suddenly. This is an earthquake.  The plate movements cause FAULTS. Faults are breaks in the Earth’s crust. The plates move along these faults. Convection Currents in the Mantle, move the plates. VIDEO
• 6.  Most happen near tectonic plate boundaries.  This is where there is the most stress from plate movement.
• 7.  Normal Fault  Click for video  Normal Faults happen at DIVERGENT boundaries All of the Red lines show a divergent boundary (Mid ocean ridge)
• 8.  Reverse Fault  Click for video  Reverse Faults happen at CONVERGENT boundaries Ex: Mariana Trench. The Mariana plate and Pacific plate are converging. The Pacific plate subducts the Mariana Plate.
• 9.  Strike Slip Fault  Click for video  Strike Slip Faults happen at TRANSFORM boundaries Ex: San Andreas Fault in California, USA North American plate colliding with the Pacific plate.
• 10. 1. Which Seismic wave moves the fastest? P or primary waves What is the point where an earthquake happens in the Earth called? It is called the focus. 3. What is the term given the process which moves tectonic plates? The process which moves tectonic plates is called Convection. 2. 4. 5. Which type of plate boundary can be found at strike slip faults? A Transform boundary At convergent boundaries, name the faults that occur. Reverse Faults occur at convergent boundaries.
• 11. If you have questions about this topic:  See me before exams (at lunch, break time, after school)  Message me over Edmodo or Facebook  Re-watch the videos and read the power points