| A | B |
|---|
| focus | point in earth's crust where the rocks actually broke and moved |
| epicenter | map location of the earthquake |
| Richter Scale | scale measuring earthquake magnitude |
| elastic rebound | process of rocks snapping back into position - the cause of an earthquake |
| aftershock | "earthquake after the earthquake" |
| seismograph | instrument that detects seismic waves |
| list 3 earthquake waves | P,S,L |
| New Madrid | mid-plate fault zone in N.A. |
| fault | crack in rocks along which movement has occured |
| Moho | boundary between crust and mantle |
| shadow zone | belt around earth that receive no earthquake waves |
| time it takes a P-wave to travel 4000km | 7 minutes |
| distance to an earthquake with an S-P lag of 8min. 20s | 6800km |
| anticline | upfold in rock layers |
| syncline | downfold in rock layers |
| normal fault | hanging wall moves down |
| reverse fault | hanging wall moves up |
| active continental margin | occurs along plate boundaries; ex. west coast of N.A. |
| passive continental margin | not at plate boundary;ex. east coast of N.A. |
| strike | compass direction of a fold |
| limb | side of a fold |
| list three evidences of uplifting | 1. fossils high above sea level 2.raised beaches 3. using instruments to measuring it |
| give an example of fault-block mountains | Sierra Nevadas |
| What lifts up a plutonic dome mountain? | a laccolith |
| what process raises a tectonic dome mountain? | uplifting due to compressional forces |
| How far away is an earthquake if the S-P time lag is 3min30s? | about 2000km |
| How long does it take an S wave to travel 6000km? | about 16min40s |
| How far is an earthquake's epicenter if the P waves arrive at 4:00 and the S-waves arrive at 4:05? | about 3400km |
