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Science Do Now: 12-10

Science Do Now: 12-10. HW: COMPLETE THE QUESTIONS FROM TODAY’S NOTES Stack your grade report if it needs to be turned in today. Stack your Do Now sheets for collection Open text book to page 230 Today ~ Power Point w/notes: Measuring Earthquakes. Measuring Earthquakes.

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Science Do Now: 12-10

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  1. ScienceDo Now: 12-10 HW: COMPLETE THE QUESTIONS FROM TODAY’S NOTES • Stack your grade report if it needs to be turned in today. • Stack your Do Now sheets for collection • Open text book to page 230 Today ~ Power Point w/notes: Measuring Earthquakes

  2. Measuring Earthquakes

  3. Did you hear about any earthquakes that occurred today? • USGS- EARTHQUAKE INFORMATION

  4. Locating Earthquakes Seismic waves are detected at seismographic stations located around the world They are located at or near the Earth’s surface

  5. How does a seismograph work? • Seismograph: records ground movements of earthquakes • The pendulum sits still while the rotating drum and ground moves. • Seismogram shows the earthquake motion.

  6. Where is the center of an earthquake? • Focus: Point where rocks break UNDERGROUND • Epicenter: Center of earthquake ABOVE GROUND

  7. The S-P MethodLocating an Epicenter • Distance to the epicenter is measured on a time-distance graph. • It takes THREE seismograph stations to locate an epicenter. A circle is drawn around each location. The epicenter is where the 3 circles overlap.

  8. Epicenters from 1977 - 1996

  9. Earthquake Scales • There are two different scales used to measure earthquakes: • The Richter Magnitude Scale • The Modified Mercalli Intensity Scale

  10. The Richter Scale • Measures the amount of ground motion. • Ranks from 1-10 • Each 1 point jump increases the ground motion 10 times!! • Measured using a seismograph Magnitude Estimated effects 2.0 can be detected only by seismograph 3.0 can be felt at epicenter 4.0 can be felt by most people in the area 5.0 causes damage at epicenter 6.0 can cause widespread damage 7.0 can cause great, widespread damage

  11. The Mercalli Scale • Ranks from 1-12 with Roman Numerals • Measures the intensity which = DAMAGE • One Earthquake can have more than one intensity level

  12. What are the worst earthquakes ever recorded?

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