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Ch. 9 Earthquakes
Question | Answer |
---|---|
What do seismologists commonly use to describe the magnitude of an earthquake? | Richter Scale |
What is one way to make your home seismic safe? | Place heavy items on lower shelves |
What is the greatest loss of life in an earthquake due to? | structures built by people |
What type of wave causes the greatest destruction during an earthquake? | surface waves |
How much more energy does an earthquake with a magnitude of 7.5 release than an earthquake with a magnitude of 6.5? | 32 times more |
What phase of matter do secondary waves not go through? | liquid |
What is the slowest seismic wave? | secondary waves |
What wave arrives at a seismograph station first? | primary waves |
When rocks break below the sea or ocean, the energy is released in what form? | tsunami |
What determines how far an epicenter is from a seismograph station? | how far apart the p and s waves are |
What waves cause rock particles to move up and down? | Secondary waves |
What waves cause rock particles to squeeze and compress? | primary waves |
What type of fault results from compression causing the rock to move upwards? | reverse fault |
What type of fault results from tension causing the rock to move downward? | normal fault |
What type of fault results from shear force causing the rocks to move side to side? | strike-slip fault |
What is the area between 105 and 140 degrees from an earthquake's focus where no seismic waves occur called? | shadow zone |
What is the boundary between the crust and the mantle called? | Moho Dicontinuity |
The San Andreas is an exmaple of what type of fault in California? | strike-slip |
What is the origin of an earthquake called? | focus |
What is the area called straight above the focus? | epicenter |
What is a person who studies earthquakes called? | seismologist |