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

meizoseismal region

Earth science; Seismology

The area of strong shaking and significant damage in an earthquake.

arrival

Earth science; Seismology

The appearance of seismic energy on a seismic record.

takeoff angle

Earth science; Seismology

The angle that a ray makes with a downward vertical. Used in determining depth phases.

back-azimuth

Earth science; Seismology

The angle measured from north to the direction from which the energy arrives at a given station. Is used to determine the longitudinal and transverse directions for an incoming ...

azimuth

Earth science; Seismology

The angle measured clockwise from north a ray must travel to arrive at a given station.

dip

Earth science; Seismology

The angle between a geologic surface -- for example, a fault plane -- and the horizontal. The direction of dip can be thought of as the direction a ball, if placed upon the tilted ...