Earthquakes
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2010-12-15 00:44
Section
| Question | Answer |
|---|---|
| What was the strongest measurement on the Ritcher scale? | 8.9 |
| Where is the shadow zone located? | 103 degress to 143 degrees |
| How do we measure the magnitude of an EQ? | Ritcher scale |
| What must be reached in order for an EQ to occur? | Elastic Limit |
| What is the fasest wave?W | P wave |
| What wave moves in an up and down moition? | S wave |
| What wave only moves on the surface? | L wave |
| What is the defintion for stress? | force applied to crust |
| Waves that move in a circular moition? | L wave |
| Location A had an EQ of 2.5--Location B had an EQ of 5.5...What is the difference? | 1,000 times (Take the difference and create a zero for the amount of differences, add 1 and commas) |
| What two terms go along with--tension? | Divergent and Normal Fault |
| What two terms go along with--compression? | Convergent and Thrust or Reverse fault |
| What two terms go along with--shearing? | Transform and Strike-slip fault |
| T/F-- The strongest EQ ever recorded was an 8.9 on the Mercalli scale? | False |
| T/F-- S waves move in a direct line? | False |
| Which instrument measures EQ's? | Seismographs |
| T/F-- The Mercalli scale is open-ended? | True- the numbers are 1-12 Roman Numerals, no decimals |
| Which wave is as half as fast as the P wave? | S wave |
| Where most EQ's occur? | Faults and plate boundaries |
| 3 EQ's that reached a 12 on Mercalli? | Tangshan, Guteamala, and San Francisco |
| What is a fault? | A crack in the Earth's crust where movement occurs |
| Forces pushing together at opposite ends? | Compression |
| Area that is overdue for an EQ? | Seismic gap |
| Explains that when stress on rocks becomes too great, the energy is released and the rock snaps back? | Elastic Rebound Theory |
| Why did those 3 EQ measure a 12 on the Mercalli scale? | They had L waves |
| What are 2 charcteristics of S waves? | 1/2 as fast as P waves/Travel up and down |
| How do seismic waves tell us about the inside of the Earth? | Waves change speed |
| Name five EQ predictions | Animal behavior,Foreshocks,changes in Earth's crust,Magnetic and electrical properties,previous earthquakes,tilting of ground, decrease of local p waves |
| The Ritcher scale uses __________ to describe how strong the ___________ were or how much energy is released? | Numbers, Vibrations |
| What is an EQ? | Vibrations in the Earth's caused by the rapid release of energy |
| What are the two ways to measure EQ's? | Intensity and Magntitude |
| Intensity measures... | How much damage an EQ caused |
| Magnititude measures... | The strength of an EQ, describes how strong the vibrations are |
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