Term
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Definition
| Earthquakes that are weaker than the principal tremor. |
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Definition
| Seismic waves that travel through the interior of the earth. (P waves and S waves). |
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Definition
| Movement along faults that occurs gradually and relatively smoothly. |
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Definition
| Fault in which the displacement is vertical, up and down in the direction of dip. |
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Definition
| When stress at last exceeds the rupture strength of the rock, a sudden movement occurs to release the stress. |
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Definition
| A period of stress buildup, sudden fault rupture in a major earthquake, followed by a brief interval of aftershocks reflecting minor lithospheric adjustments, then another extended period of stress build up. |
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Definition
| When the rocks snap back elastically to their previous dimensions. |
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Definition
| The point on the earth's surface directly above the focus. |
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Term
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Definition
| Planar breaks in rock along which there is displacement of one side relative to the other. |
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Definition
| The point on a fault at which the first movement or break occurs during an earthquake. |
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Definition
| Measure of the earthquake's effects on humans and on surface features. |
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Term
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Definition
| When wet soil is shaken by an earthquake, the soil particles may be jarred apart, allowing water to seep in between them, greatly reducing the friction between soil particles that gives the soil strength, causing the ground to become somewhat like quicksand. |
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Term
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Definition
| The amount of ground motion caused by an earthquake. (Richter magnitude Scale) |
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Term
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Definition
| Things that happen or rock properties that change prior to an earthquake. |
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Term
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Definition
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Term
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Definition
| Dormant sections of otherwise active fault zones. |
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Term
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Definition
| Waves that are released when earthquakes occur. |
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Term
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Definition
| Device used to detect ground motions of Seismic Waves. |
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Term
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Definition
| (horizontal) A fault that is along which the displacement is parallel to the strike. |
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Term
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Definition
| They cause rocks and soil to be displaced in such a way that the ground surface ripples or undulates. ( Love and Rayleigh waves) |
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Term
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Definition
| are shear waves, involving a side-to-side motion of molecules. |
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Term
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Definition
| Are just revers faults with relatively shallowly dipping fault planes. |
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Term
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Definition
| Seismic Sea waves, sometimes improperly called tidal waves. |
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Term
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Definition
| the compass orientation of the line of intersection of the plane of interest with the earth's surface. |
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Term
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Definition
| The angle the plane makes with the horizontal, a measure of the steepness of slope of the plane. |
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Term
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Definition
| A dip-slip fault in which the block has moved up relative to the block below. |
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Term
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Definition
| Dip-slip fault in which the block above the fault has moved down relative to the block below. |
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