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| The shaking and trembling that results from the movement of rock beneath the earth |
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| The area beneath the Earth |
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| The point on the surface directly above the focus. |
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| waves that compress and expand the ground like an accordion. |
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| Waves that move more slowly but can produce severe ground movement. |
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| An instrument that records and measures seismic waves. |
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| the maximum displacement of the particle motions, or the height of the ripple crest. This is the size of the wiggles on an earthquake recording. From rest to crest. |
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| the number of times something happens in a certain period of time, such as the ground shaking up and down or back and forth during an earthquake. |
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| the amount of distance traveled in a specific time frame. |
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| the distance between successive points of equal amplitude and phase on a wave. |
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| A weak spot in the crust where molten material or magma comes to the surface. |
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| A molten mixture of rock-forming substances, gases and water from the mantle. |
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| a volcanic belt formed by the many volcanoes that rim the Pacific Ocean. |
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| a pocket of magma beneath the surface. |
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| A long tube in the ground that connects the magma chamber to the earth |
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| An opening where molten rock and gas leave the volcano. |
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| a bowl shaped area that may form at the top of a volcano around the central vent. |
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| occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs. |
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Definition
| Volcanoes that Scientists expect to awaken in the future and become active. |
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| Volcano erupting or showing signs that it may erupt in the near future. |
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