Seismology

Seismology

The study of earthquake, seismic sources, and wave propagation through the Earth.

Industry: Earth science

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Seismology

Crust

Earth science; Seismology

The outermost major layer of the Earth, ranging from about 10 to 65 km in thickness worldwide. The continental crust is about 40 km thick in the Pacific Northwest. The thickness of the oceanic ...

Gradient

Earth science; Seismology

The partial derivative of the vectors in three directions. The gradient vector point in the direction of steepest slope.

The phenomena where azimuth dependence is due to fault propagation effects (i.e. stations lying in the directions of rupture propagation may get higher amplitudes than those lying in an area where ...

Seismic hazard

Earth science; Seismology

The physical effects such as ground shaking, faulting, landsliding, and liquefaction that underlie the earthquake's potential danger.

Focus

Earth science; Seismology

The place at which rupture commences resulting in an earthquake.

Fault plane

Earth science; Seismology

The plane that most closely coincides with the rupture surface of a fault.

Rupture zone

Earth science; Seismology

The area of the Earth through which faulting occurred during an earthquake. For very small earthquakes, this zone could be a few millimetres long, but in the case of a great earthquake, the rupture ...