Upload
gillian-lyn
View
223
Download
0
Tags:
Embed Size (px)
Citation preview
Chapter 5, Section 4Monitoring 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. 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.
Fault Monitoring Devices
Four instruments are used to monitor faults. Creep meters Laser-ranging devices Tiltmeters Satellites
Creep Meters
Creep meters use a wire stretched across a fault to measure sideways movement of the ground.QuickTime™ and a
TIFF (Uncompressed) decompressorare needed to see this picture.
Laser-Ranging Devices
Laser-ranging devices use a laser beam that bounces off a reflector that detects even the slightest fault movements.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Tiltmeters
Tiltmeters measures how much the ground has tipped along a fault.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Satellites
Satellites use radio waves to bounce off the ground to measure changes in elevation.QuickTime™ and a
TIFF (Uncompressed) decompressorare needed to see this picture.
Homework
Workbook 5.4 -- Monday, 2/22Vocabulary Quiz 5.4 -- Wednesday, 2/24