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| A seismic wave that travels outwards from the focus, and travels through the Earth's interior. |
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| A seismic wave that travels around the Earth's surface. |
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| When a change in shape reverses when force is removed. |
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| Elastic Rebound Hypothesis |
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| The hypothesis of earthquake formation. Some fault surfaces are rough, become locked. |
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| The surface center of an earthquake. |
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| The overall origin of an earthquake. |
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| A break or fracture in rock. |
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| The sudden disturbance of liquid which turns seemingly solid ground to quicksand. |
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| The measure of energy of an earthquake. |
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| Modified Mercalli Intensity (MMI) |
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Definition
| A scale used to quantify the magnitude of earthquakes. |
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| Not YOLO. Mohorovicic Discontinuity. The base of the crust that separates the crust from the underlying zone of denser composition. |
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| The first waves recorded by a seismograph after an earthquake. |
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| The second waves recorded by a seismograph after an earthquake. |
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| When seismic waves are reflected by numerous bounderies inside the planet. |
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| When the speed of a wave changes as it passes from one medium to another, causing i to bed. (Pencil in water.) |
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| A measurement of the amplitude of seismic waves. Corrects for distance from the epicenter. |
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| Bounderies where the velocity of waves changes suddenly rather than smoothly. |
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| Places where earthquakes haven't occurred in a long time. |
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| The scale used to determine the magnitude of a quake. |
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| The vibrations caused by elastically stored energy carried out to other parts of the Earth. |
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| A recording made by a seismogram. |
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| A machine used to record seismic waves. |
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| A type of magma that contains about 60% silicon and lots of dissolved gas. |
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| A type of magma that's has 60% silicon and little dissolved gas. (80% of magma from all volcanoes.) |
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Definition
| Similar to stocks, huge plutonic bodies that are fundamental building blocks of continental crust. |
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| A large depression near the summit of a volcano several kilometers in diameter. Formed by collapse after eruption. |
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| A volcano that is dormant. |
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| What comes out of a volcano. |
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| When lava reaches the surface of Earth through an elongate vent. |
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| Places lava is fed to the surface by plumes. |
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| An upwelling mass of hot air (see: Glenn Beck) and material. |
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| Magma that reaches the Earth's surface. |
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| A mixture of molten rock, minerals grains, and dissolved gas formed at high temperatures. |
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| When something melts only partially. |
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| A fragment of hot shattered magma ejected during an explosive eruption (ewwww....) |
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| A mobile mass of tephra that is denser than the atmosphere and will not rise into the air, but just flow over. |
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| Consolidated, solid tephra. |
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| A deposit of unconsolidated loose pyroclasts. |
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Definition
| A type of magma containing 70% silicon and the highest gas content. |
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| A dome-shaped volcano with a small slope, formed by successive eruptions of basaltic lava. |
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| Your typical cone-shaped volcano. Has layers of lava and tephra. |
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| The cone that builds up around the vent of a steep volcano. |
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| The property that causes a substance to resist flowing. Magma viscosity depends on composition |
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| The smallest tephra particles. |
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| Small amounts of gas dissolved in magma. |
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| A vent from which melted rock, solid rock debris, and gas is expelled. |
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