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13 Cards in this Set
- Front
- Back
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What is a seismograph?
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It is an instrumental thaat records seismic activity.
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What is the paper record of a seismic event?
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It is called a seismogram.
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How many seismographs are needed to accurately locate an earthquake epicenter?
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At least three seismographs are needed to accurately locate an earthquake epicenter.
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How did scientists discover changes in Earth's interior?
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Scientists discovered changes in Earth's interior by studying changes in seismic waves.
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What happens when seismic waves reach the bottom of the crust?
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They speed up.
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What hapens when primary waves hit the liquid outer core?
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They slow down.
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What happens when secondary waves when they hit the liquid outer core?
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They stop.
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What are 3 characteristics of earthquakes?
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Most earthquakes happen without warning, in areas where earthquakes have occurred in the past, and along plate boundaries.
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Who are seismologists?
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They are people who study earthquakes and seismic waves.
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What is magnitude?
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It is the amount of energy an earthquake releases.
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What measures the magnitude of an earthquake?
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the Richter scale
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What are seismic sea waves called?
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Tsunamis
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What are some things that will improve safety factors during an earthquake?
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1) study an area's earthquake history
2) make sure hot-water heaters are held securely in place 3) take heavy objects down from high places |
