Can_Natural_Disasters_Be_Predicted_1_

Can_Natural_Disasters_Be_Predicted_1_ - Can Natural...

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Can Natural Disasters Be Predicted? Volcanoes Volcanologists use many instruments to help them predict eruptions. Here are some exapmles: Luigi Palmieri invented a seismograph in 1856 while working near Italy's Mt. Vesuvias. He wanted a way to predict eruptions, and knew that tremors were usually felt before an eruption. The seismograph uses a pendulum to record movement of the ground below it. The squiggly lines recorded on paper by a seismograph are called a seismogram . The tiltmeter is a sensor that uses a laser beam to find the rising or lowering of magma levels by measuring changes in ground elevation. Earthquakes Nobody has been able to predict earthquakes reliably enough and over short enough time scales to allow the evacuation of threatened cities. Some scientists say that so many factors decide whether a fault will rupture that earthquakes could be unpredictable. One basic idea behind quake prediction is that faults send out subtle but detectable warnings before they slip. Scientists have looked at a host of potential warning signals, or "precursors," including
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