20 Terms
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Seismology
The study of earthquake, seismic sources, and wave propagation through the Earth.
Industry: Earth science
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Seismology
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 centimetres per year through many geological ...
Epicentre
Earth science; Seismology
The point on the earth's surface directly above the focus (hypocentre) of an earthquake.
Epicentre
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 locate it.
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 travelling away from a seismic event through the rock and consisting of a train of compressions and dilatations of the material. P-waves can travel through the entire ...
Antipode
Earth science; Seismology
The point exactly opposite of the epicentre 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 the crust is ...
