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Earthquake Measurements Quick Write In this chapter, you will learn about earthquakes and their causes? Write down these questions and answer them in complete sentences. 1. How are EQs measured? 2. Where are most EQs found? 3. Why are there no EQs larger than 9.8? 1. Amount of energy releases by an EQ? Magnitude. 2. Magnitude reported with? Richter Scale. 3. Richter Scale values? 0.1 to about 9.8 maximum. 4. Modified Mercalli Scale? Measures EQ intensity. 5. Intensity? Examples of damages to the crust or buildings. Example I to XII. 6. Locating EQs? Need at least three seismic stations. Check for Understanding Movie The Richter Scale measures _____, while the Modified Mercalli Scale measures ______. Intensity/Magnitude or Magnitude/Intensity A value of 7.7 is from the ______, while a value of VII is from the ______. Richter Scale/MMS or MMS/Richter Scale 7. Seismic belt? Locations where EQs are common. 8. Where are seismic belts normally found? At plate boundaries. 9. What other hazards are found at plate boundaries? Volcanoes. 10. Can EQs be found away from plate boundaries? Yes, hot spots have many EQs too. 11. Why can’t there be Richter Scale values higher than 9.8? The Earth’s crustal rocks aren’t strong enough to handle enough stress and strain to store that much energy. Check for Understanding Movie A location where many earthquakes are found is called a _____ _____. Many earthquakes occur at _____ _____. Seismic Belt/Plate Boundaries or PB/SB Why can’t EQs larger than about 9.8 occur?