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Monitoring Earthquakes
Seismograph: a device used to record movement from seismic waves
Seismogram: the record of seismic waves Provide us with the arrival times for P, S, and L waves The height of the lines indicated severity of the seismic wave
Fault Monitoring
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Scientist monitor faults for vertical and horizontal movement Scientist use a variety of detectors to measure changes around a fault Scientist can NOT predict earthquakes, but they can map information
that can determine risk areas
1. Tiltmeters: Measure the changes in liquid levels inside a container Measures vertical movement
2. Creep meters: Measures the movement of a wire that is anchored on both side of a
fault Measures horizontal movement
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3.Laser-Ranging Device Measure the movement of a laser beam that is reflected across a fault Measures horizontal movement
4. GPS Satellites Measures changes in elevation, tilt, and horizontal motion Measures horizontal and vertical motion