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

ground shaking

Earth science; Seismology

General term referring to the qualitative or quantitative aspects of movement of the Earth's surface from earthquakes or explosions. Ground motion is produced by waves that are ...

gravity

Earth science; Seismology

The attraction between two masses, such as the Earth and an object on its surface. Commonly referred to as the acceleration of gravity. Changes in the gravity field can be used ...

variance

Earth science; Seismology

The arithmetic mean of the squared deviations from the mean.

sea-floor spreading

Earth science; Seismology

The process by which adjacent plates along midoceanic ridges move apart to make room for new sea-floor crust. This process may continue at 0. 5 to 10 centimeters per year through ...

epicentre

Earth science; Seismology

The point on the earth's surface directly above the focus (hypocentre) of an earthquake.

epicenter

Earth science; Seismology

The point on the Earth's surface directly above the (subterranean) point of origin (hypocenter) of an earthquake; only two measurements, latitude and longitude, are needed to ...