| A | B |
|---|
| focus | the pt. at which the rocks break |
| epicenter | pt. directly above the focus on the earth's surface |
| tsunami | largest tidal wave created by an earthquake |
| Richter scale | scale divised by Carles Richter to show the strength of an earthquake |
| Merchalli scale | Scale devised to show the amount of damage created by an earthquake |
| S wave | Secondary wave that arrives at a given location after P waves. |
| P wave | fastest wave that travels through solids, liquids, and gases |
| L wave | Surface wave and the most destructive wave |
| Side to Side motion | S wave |
| Up and Down motion | L wave |
| Push and Pull wave | P wave |
| magnitude | Designated numbers 1-10 given to an earthquake to indicate the strength of the quake |
| Missouri | Early 1900's an earthquake was sent through this state with thestrength of a 7 on the richter scale |
| seismograph | machine devised to detect a quake |
| seismogram | record of an earthquake |
| seismic waves | vibrations recorded by the earthquake |
| intensity | the amount of damage created |
| San Andreas Fault | a large fault in California |
| fault | a fracture within the Earth where rock movement occurs |
| Buffalo, NY | location of the National Center for Earthquake Engineering Research |
| reverse fault | rock above a fault that moves upward |
| normal fault | rock above a fault that moves downward |
| San Francisco | city which had major earthquakes in 1906 and 1989 |
| seismologist | scientist who studies earthquakes |
