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earthquakes
| Question | Answer |
|---|---|
| what statement correctly compares seismic P-waves with seismic S-waves? | P-waves travel faster then S-waves and can pass through Earth's liquid zones |
| what is the motion of P-waves called? | (compressional waves) travel faster then S-waves (shear waves) |
| what process prevents P-waves from arriving at a seismic station? | refraction |
| what can P-waves do that S-waves can not? | -waves cant travel through liquids, while P-waves can |
| a seismograph station records a difference in arrival time between the S- and P-wave of 4 minutes. About how far away is the earthquake epicenter? | 2,600 km |
| following an earthquake, a seismograph station recorded the arrival of a P-wave at 3:09:30 a.m. and an S-wave at 3:14:00 a.m. What is the distance from the seismograph station to the epicenter of the earthquake? | 3,000 km |
| an earthquake occurred at 5:00:00 a.m. At what time would the P-wave reach a seismic station 3,000 kilometers from the epicenter? | 5:05:40 a.m. |
| the arrival of P-waves and S-waves at a seismic station indicated that an earthquake occurred 4,000 km from the station. The P-wave arrived at 3:32:30 p.m. When did the earthquake occur? | 3:15:30 p.m. |
| why is this unit called the Earth DYNAMIC crust? | it is constantly changing |
| what is the driving force behind the movement of tectonic plates? | the convection of the mantle |
| what is an earthquake? | caused by a suden release of energy |
| what is a fault? | a crack in a mass of rock along which there has been a movement of rock layers on either side of the crack |
| what is a focus? | where the earthquake begins below the surface |
| what is an epicenter? | the location directly above the focus either on land or in water |
| what is the relative motion of the land mass around a normal fault? What is the name for this kind of force? | when rocks are being pulled apart (tensile) |
| what is the relative number what is the relative motion of the land mass around a reverse fault? what is the name for this kind of force? | when rocks are pushed up against each other and one side slides up |
| what is the relative motion of the land mass around a transform fault? | when rocks move side by side in an opposite direction |
| what is a fancy scientific word for earthquakes? | seismic |
| how do the seismic waves appear on a seismograph? | the table shakes which causes the needle to move up and down on a sheet of paper due to the weight |
| the speed of the seismic waves are not fixed. what does the speed or velocity of seismic waves depend on? | the type of wave (P-wave or S-wave or surface wave) |
| what is ti called when a wave changes its direction? | refraction |
| why do seismic waves bend as they travel through the Earth? | because of it's velocity and materials with different densities |
| what is a shadow zone? | Place where P-and S-waves cannot travel to due to their different densities |
| shadow zones exist because S-waves can not travel trough what? | the liquid outer core |
Created by:
juliablue0921