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| a break in a mass of rock which movement occures. Many faults occur along plate boundaries. They break from stress of plates. |
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| Primary waves. Longitudal waves similar to sound waves. They compress and expand the ground. They are tge fastest seusnuc waves, They can travel through solids and liquids. |
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| Secondary waves. transverse waves like light. Cause particles around them to vibrate at right angles to the direction waves move. Cant travel through liquid. MOve 1/2 speed of p waves. |
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| Develop when seismic waves reach surface. MOve slower than s waves but produce larger ground movements. Some are transverse and others have a rolling motion. |
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| Location beneath earth's surface where earthquake begins. |
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| Location on earth's surface directly above the focus |
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| Measures ground movements caused by seismic waves |
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| Measures the amount of energy released by earthquake. |
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| Wide flat volcano that forms by quiet eruption of low viscosity lava. |
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| eruption of entirely ash and cinders will make a small steep sided volcano. |
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| is formed from explosive eruptions that produce a combo of lave and ash |
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