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QUIZ 10/28

QUIZ 10/28. What does the Richter scale measure? What does the Modified Mercalli Scale measure ? What scale is used to describe the amount of damage caused by an earthquake? How many seismic stations are needed to locate the epicenter of an earthquake? BONUS

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QUIZ 10/28

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  1. QUIZ 10/28 • What does the Richter scale measure? • What does the Modified Mercalli Scale measure? • What scale is used to describe the amount of damage caused by an earthquake? • How many seismic stations are needed to locate the epicenter of an earthquake? BONUS • Describe the effect of an earthquake with a 9.0 on the Richter Scale. • What is a Seismologists?

  2. EQ HAZARDS • Probability of an EQ is determined by historic occurrences • Identify EQ hazards help in preventing some damage and loss of life

  3. Hazards • Structural Failure • Land & Soil Failure(soil liquefaction) • Tsunami • Landslides & Fires

  4. Soil Liquefaction

  5. TSUNAMI • A large ocean wave generated by vertical motions of the seafloor during an EQ • In deep oceans the waves travel fast with a height of 1 m • When waves enter shallow water, height could exceed 30 m

  6. DECEMBER 2004 TSUNAMI • INDIAN OCEAN EARTHQUAKE • Magnitude 9.0 EQ about 160km west of Sumatra • A 30 m plus tall wave struck several nations • What do you think the Death toll was 225,000

  7. NY Times

  8. EQ Forecasting Probability of an EQ occurrence based on: • History of EQ in an area • Rate at which strain builds up in the rocks

  9. EARTHQUAKES WORLD WIDE • 500,000 detectable earthquakes in the world each year. 100,000 of those can be felt & 100 of them cause damage • The largest recorded earthquake in the world was a magnitude 9.5 (Mw) in Chile on May 22, 1960 • The world's deadliest recorded earthquake occurred in 1556 in central China killing an estimated 830,000 people

  10. ANY QUESTIONS?

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