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Quiz/Review

Quiz/Review. Get out a small piece of paper and put your name on it. When the bell rings, the quiz will begin. Question 1. Where do most earthquakes occur?. Question 2. Why have so many more people died from earthquakes in the recent years compared to 200 years ago?. Question 3.

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Quiz/Review

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  1. Quiz/Review • Get out a small piece of paper and put your name on it. • When the bell rings, the quiz will begin.

  2. Question 1 • Where do most earthquakes occur?

  3. Question 2 • Why have so many more people died from earthquakes in the recent years compared to 200 years ago?

  4. Question 3 • Where is the epicenter of an earthquake?

  5. Answers • Plate boundaries • More population, cities concentrate people • Epicenter is directly above the focus and on the surface of the earth.

  6. How to find an Earthquake?!

  7. How do we locate exactly where an earthquake occurred? • Using seismic waves collected around the world. • Identifying where the energy is the greatest. • Using charts. • Computers do much of the work now, but humans have to double check and confirm.

  8. Find P wave arrival Find S wave arrival Find Difference (S-P) Subtract Ref Table Use number from step 2 Go to map and draw circle to scale at distance Repeat at least two more times Steps (write this down)

  9. Reference Table Which wave is faster? What happens as you get further away? Each line = __________ Each line = _________

  10. Step 1: P and S wave arrival • P-wave arrival time = ??? • First big blip • S-wave arrival time = ??? • Second big blip • P = 4 minutes • S = 8 minutes

  11. Step 2:Find Interval • P = 4 minutes • S = 8 minutes hr : min : sec S-wave 00:08:00 P-wave -00:04:00 00:04:00 minutes • Take the 4 minutes and open your ESRT to pg 11. ALWAYS use hr : min : sec Format!

  12. Step 3:Ref Table • Find 4 minutes HERE (RED line) 1. Then, count the boxes or draw a line on scrap. 2. Then, slide the scrap or count the difference in between S & P waves 3. Read off distance on x axis 2800 km

  13. Safety compass Safe?  • Set center point to 0. • Move arrow to distance. • Put your finger on circle and pen in arrow. Be carful do NOT over turn the screw! Distance slider Center circle Safer ! 0 1000 2000 3000

  14. Step 4:Map It! 0 1000 2000 3000

  15. Step 5: Do it again • Find P wave arrival ~S wave arrival • Find Difference (S-P) Ref Table ~Use number from step 2 • Go to map and draw circle to scale at distance

  16. Now what??Where is the EQ? 0 1000 2000 3000

  17. Do it again • Find P wave arrival ~S wave arrival • Find Difference (S-P) • Ref Table ~Use number from step 2 • Go to map and draw circle to scale at distance

  18. EQ is Here 0 1000 2000 3000

  19. Let’s Review • Step 1: • Find the arrival times • Step 2: • Subtract S-P wave times (S-P interval) • Look up on ESRT 11 the distance. • Step 3: • Look up on ESRT 11 the distance. • Find the S-P interval on the Y-axis and then find that in between the P & S wave lines. • Step : 4: • Once you have 1 distance draw circle. • Steps 5: • Repeat at least 2 more times!

  20. P-Wave travel time • This is the time it takes for the P-wave to get to the recording station. • It’s simple to find! • Use the epicenter distance you already found. • Go to that distance on your ESRT and follow a line up to the P-wave line. • Follow to the left and read off the time!

  21. Let’s try • Subtract: • 12:00:00 11:34:30 01:21:10 • -11:55:30 -11:30:50 -01:18:18

  22. Locating an epicenter video

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