| Term | Definition |
|---|
| Richter Scale | Scale used to measure the strength of an earthquake |
| Epicenter | point on the earth surface directly above an earthquake's focus |
| Focus | Starting point of the earthquake |
| Seismograph | An instrument located at or near the surface of the earth that records seismic waves |
| seismogram | a tracing of earthquake motion created by a seismograph |
| seismic waves | waves of energy that travel through the earth |
| seismic gap | an area along a fault where relatively few earthquakes have occured |
| seismology | the study of earthquakes |
| shadow zone | an area on the earth's surface where no direct seismic waves from a particular earthquakes can be detected |
| S waves | second-fastest type of seismic wave, side-to-side waves; 2nd, slower, & go though solids; |
| Shear waves | S waves are also called Shear waves and secondary waves |
| P waves | fastest type of seismic wave; it can travel through the solid, liquids and gases; also known as primary waves |
| Moho | a place within the Earth where the speed of seismic waves increases sharply |
| Moho | marks boundary between Earth's crust and mantle |
| fault | a break in the Earth's crust along which blocks of the crust slide relative to one another due to tectonic plates |
| elastic rebound | the sudden return of elastically deformed rock to its original shape |
| deformation | the change in shape of rock in response to stress |
| fault | is a break in the crust along which blocks of rock slide past each other |
| Earthquake occurs along | faults due to sliding |
| There are many faults on | plate boundaries |
| elastic rebound | is when the rocks suddenly returns to its original shape |
| Body waves | travel through the earth's interior |
| shadow zone | area where earthquakes cannot be detected |
| gap hypothesis | states that the section of active faults that have had relatively few earthquakes are likely to be the sites of strong earthquakes in the future |
| shallow focus earthquakes are found on the coast of South America | the plates have moved east and deeper |
| surface waves | move ground up and down in circles; slowest; most destructive; feels like a roller coaster |
| the smaller the earthquake the more often you get them | relationship between earthquake strength & frequency |
Combine with other sets
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