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BLPhysical Geography
Faulting, Folding and Earthquakes
| Question | Answer |
|---|---|
| Focus | Deep below surface where earthquake starts |
| Epicenter | Point on earths surface directly above focus where earthquake is strongest |
| Seismograph | Instrument used to measure and record the seismic waves |
| Richter Scale | The scale used to measure the magnitude of an earthquake |
| Tsunami | Caused by an underwater earthquake. Massive waves. |
| Liquifaction | Liquefaction is a phenomenon in which the strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading. |
| Compression | Squeezes and shortens rock, causes faulting and folding. |
| Tension | Stretches body of rock. |
| Shearing | Fractures rock and pushes sections past each other. |
| Anticline | When rocks are compressed the layers are pushed upwards forming these. |
| Syncline | When rocks are compressed and pushed downwards |
| Scarp | The exposed section of a normal fault |
| Tear Fault | A fracture in rock when one rock moves sideways past another rock |
| Normal Fault | When crust is extended until a fault occurs |
| Reverse Fault | When the earths crust is compressed until a fault occurs |