| A | B |
|---|
| What do you call machines that measure earthquakes? | Seismometers or seismographs |
| What are the first waves that leave an earthquake? | P or Primary Waves |
| What do you call the second waves that leave an earthquake? | S or Secondary Waves |
| What are the faster waves that leave an earthquake? | P or Primary Waves |
| What kind of waves reach a seismometer first from an earthquake? | P or Primary Waves |
| What do you call the actual place in the Earth's crust where an earthquake occurs? | The Focus |
| What do call the place on the surface of the Earth above the focus of the Earthquake? | Epicenter |
| How many seismograph stations have to report to see where the epicenter of an earthquake is? | 3,  |
| P wave arrives at 12:20:30 and S waves arrive at 12:25:50. What is the time difference? | 5 minutes 20 seconds (12:25:50 subtract 12:20:30) |
| As you live farther and farther from the epicenter of an earthquake, what happens to the difference between the P and S wave arrival time? | The lag time increases as you live farther away |
| What scale do we most use to measure the strength of earthquakes? | Richter Scale |
| Would an earthquake that is 8.5 on the Richter Scale be very destructive? | YES! |
| With only 2 seismographic stations reporting, we can narrow down the epicenter to __ places | 2 |
| Would Nebraska or California seismographs get seismic wave first from an earthquake in Mid Atlantic Ridge? | Nebraska (it is 2,000 km closer) |
| In a seismograph, does the paper or the pen move? | The paper moves and the weighted pen stays in place |
| Would a 2.9 Richter Scale earthquake cause a lot of damage? | No |
| Would a 8.9 Richter Scale earthquake cause a lot of damage? | YES!!! |
| What can one seismograph station reading tell you about an earthquake? | How far away the epicenter is (not exact location) |
If there is 5 minutes between when P and S waves arrive, how far away is the epicenter?,  | About 3,400 km |
| An earthquake that is a 6 on the Richter scale is __ times bigger in magnitude than a 3 on the Richter scale. | 1,000 X (10x increase for every number level) |
| In our soda straw lab, what kind of bracing worked best to make the wall stable (hard to break)? | Diagonal |
| Many buildings in earthquake areas are __ __ so they can "give" when the seismic waves come | Base Isolated |
| What do you call improving older buildings so they are safer in earthquakes? | Retrofitting |
| When a plate overcomes friction and suddenly snaps back under water, what is the large wall of water called that might form? | Tsunami |
| What happens to a Tsunami as it reaches shallower water? | The Tsunami gets slower and TALLER! |
| How far away is an earthquake if the S wave arrives 3'30" late?, | 2,200 km |
