SKKH+2.4

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Vocabulary
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 * Creep Meters-** a device used for measuring horizontal movement of the ground.
 * Laser-Ranging Devices-**a device that uses a beam to detect any tiny movements in the fault.
 * Tiltmeters-**a device that measures tilting of the ground.
 * Satilite Monitors-**these devices take images of faults.

Devices that Monitor Faults

 * To help predict earthquakes,geologists use instruments such as a creep meter,a laser-ranging devices,tiltmeters,and satilites.


 * Creep Meters
 * This device uses a wire stretched across a fault for measuring horizontal movement of the ground.


 * Laser-Ranging Devices
 * This device uses a laser beam to detect tiny movements along a fault.


 * Tiltmeters
 * This device consists of two bulbs ,filled with liquid and connected to a hollow stem to measure tilting of the ground.


 * Satilite Monitors
 * This device uses satilites packed with radar to take images of faults.

Monitoring Risk In the United States

 * To determine earthquake risk geologists have to find faults that are active and where past earthquakes have occured.

Diagram


This diagram shows how a laser-ranging device works. = =