JLKR+2.4

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Vocabulary
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Devices that Monitor Faults

 * unfortunately, scientists cannot always predict earthquakes accurately, but they can monitor their movements
 * creep meters
 * measures horizontal movement of the ground
 * geologists can measure the amount the fault has moved
 * laser-ranging devices
 * detect tiny fault movements
 * the device can detect any change in distance to the reflector
 * tilt-meters
 * measures tilting in the ground
 * uses water-tubes
 * satellite monitors
 * makes images of the fault
 * by comparing images, geologists detect small images in elevation
 * the changes in elevation result when stress deforms the ground along the fault

Monitoring Risk in the United States

 * geologists can determine earthquake risk by locating where faults are active and where past earthquakes have occurred