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Earthquake L4
Science
| Question | Answer |
|---|---|
| A sudden movement of the Earth's crust is called? | earthquake |
| The place where the slipping begins during an earthquake is called ? | focus |
| The surface point directly above the focus during an earthquake is called? | epicenter |
| At what point on the ground do people first feel the ground shaking? | epicenter |
| Rocks on both sides of a ______ are pushed and pulled by forces in the crust causing an earthquake. | fault (a crack in the Earth's crust) |
| What do the waves of an earthquake remind you of when looking at a pond? | ripples (throw a small rock into the pond you will see ripples spreading out, this is how the waves of an earthquake move) |
| What is an instrument that detects and measures waves produced by an earthquake called? | seismometer |
| Name the 3 different kinds of waves? | *Primary waves (P) - the fastest and move through liquid and solids move back and forth *Secondary waves (S) - half as fast as P move through only solids; up and down *Surface waves (Lg)- slowest and move like ripples, but are the most dangerous |
| How many seismometers are needed to pinpoint the exact location of an earthquake? | data from at least 3 stations - the point where the three circles intersect is the epicenter of the earthquake |
| The measure of the amount of energy released by an earthquake is called what? | magnitude |
| What measures the magnitude of an earthquake at the epicenter? | Richter scale |
| What measures what people felt and what happened to object at a specific location? | Mercalli scale |
| On a Richter scale each number that goes up indicates how many times more energy was released? | 30 times more energy |
| How many more times of energy was released when one earthquake measured 3.0 and the another measured 5.0? | 5 - 3 = 2 so 2 X30= 60 times more energy |
| I am sometimes felt after the main earthquake...what am I called? | aftershocks |
| On the Mercallli scale how is the earthquake rated? | by Roman numeral I to XII |
| What usually occurs after an underwater earthquake? | tsunamis (means wave in port) |
| Why is a tsunamis easier to predict than an earthquake? | it follows an earthquake that can be felt using seismometers |
| Name some of the safest places to be during an earthquake and during a tsunamis: | earthquake - under a sturdy table or a kitchen counter tsunami - go to high ground away from the shoreline |
Created by:
douglastmo
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