1. Chapter 5, Section 4 Monitoring 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