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Chapter 5, Section 4 Monitoring Faults

Chapter 5, Section 4 Monitoring Faults. Friday, February 19, 2010 Pages 168 -- 171. Objectives. Discover how geologists monitor faults. Understand how geologists determine earthquake risk. Monitoring Faults. Geologists place instruments that measure stress and deformation in the crust.

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Chapter 5, Section 4 Monitoring Faults

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  1. Chapter 5, Section 4Monitoring Faults Friday, February 19, 2010 Pages 168 -- 171

  2. Objectives • Discover how geologists monitor faults. • Understand how geologists determine earthquake risk.

  3. Monitoring Faults • Geologists place instruments that measure stress and deformation in the crust. • This is a means that geologists use to try to predict when and where an earthquake will occur. • Highest risks areas are determined by locating faults that are active and where past earthquakes have occurred.

  4. Fault Monitoring Devices • Four instruments are used to monitor faults. • Creep meters • Laser-ranging devices • Tiltmeters • Satellites

  5. Creep Meters • Creep meters use a wire stretched across a fault to measure sideways movement of the ground.

  6. Laser-Ranging Devices • Laser-ranging devices use a laser beam that bounces off a reflector that detects even the slightest fault movements.

  7. Tiltmeters • Tiltmeters measures how much the ground has tipped along a fault.

  8. Satellites • Satellites use radio waves to bounce off the ground to measure changes in elevation.

  9. Homework • Workbook 5.4 -- Monday, 2/22 • Vocabulary Quiz 5.4 -- Wednesday, 2/24

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