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- Number of terms: 6786
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Igneous and metamorphic rocks underlying the sedimentary rocks of a region and extending to the base of the crust.
Industry:Natural environment
The direction of ground motion as the P-wave arrives at a seismometer. Used to compute fault-plane solutions.
Industry:Natural environment
Solid rock that is exposed or underlies softer rock, sediments, or soil.
Industry:Natural environment
Earthquakes in regions of moderate to high seismicity that cannot be correlated with known geologic structures and thus are assumed to be likely to occur at any location in the region.
Industry:Natural environment
Seismic vibration from an earthquake propagated deep underground.
Industry:Natural environment
The depth below the surface of the hypocenter or focus of an earthquake.
Industry:Natural environment
Failure (sudden loss of strength) at some critical stress either by breaking along a new fracture or, most commonly, by frictional sliding on an already existing fracture.
Industry:Natural environment
