Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Seismology

fundamental mode

Earth science; Seismology

The primary frequency produced where there are no places of zero motions (see Higher modes).

P wave

Earth science; Seismology

The primary or fastest wave traveling away from a seismic event through the rock and consisting of a train of compressions and dilatations of the material. P-waves can travel ...

antipode

Earth science; Seismology

The point exactly opposite of the epicenter where the wavefront (assuming a homogeneous Earth) should arrive simultaneously at the receiver and produce strong amplifications.

lithosphere

Earth science; Seismology

The outer solid part of the Earth, including the crust and uppermost mantle. The lithosphere is about 100 km thick, although its thickness is age dependent. The lithosphere below ...

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 ...

hanging wall

Earth science; Seismology

Of the two sides of a fault, the side above the fault plane. It is called the hanging wall because where inactive faults have been "filled in" with mineral deposits and then ...