RLAF+2.4

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Monitoring Faults

 * Vocab: Creep Meters-** a device that measures how much a fault has moved
 * Laser-Ranging Device-** records movement in the faults uses reflector and laser -
 * Tiltmeters-** measures how much the fault has tilted
 * Satellite Monitors-** uses radar to show an image of the fault's movement

**Devices that Monitor Faults**

 * geologists invented new instruments
 * use many instruments to record ground movement that occur along faults

**Creep Meters**

 * device that measure every time the fault is moving
 * measures horizontal movement

**Laser-Ranging Devices**

 * a device that uses a laser and a reflector to determine the fault's movements
 * calculates change in time
 * detect change in distance



**Tiltmeters**

 * device that measures tilting of ground
 * carpenters level
 * like tiltmeter
 * Geologists
 * look at scale
 * measure amount of tilt on scale

**Satellite Monitors**

 * bounces radio waves off ground
 * echoes back to space
 * satellite records them
 * distance to satellite changes

**Monitoring Risk in the United States**

 * use devices to try and predict earthquakes
 * geologist predict where earthquakes will happen from past experience
 * stress
 * along faults
 * stress increases
 * Earthquakes
 * risk is highest in United States
 * very dangerous
 * few places are minor

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