Seismic Discontinuity

Science / Geology / Seismic Discontinuity: A surface within the Earth across which P-wave or S-wave velocities change rapidly, usually by more than +~0.2 kilometer/second.

Discontinuity

Science / Geology / Discontinuity: A surface separating rock layers of differing properties or compositions. (See seismic discontinuity.) MORE

Seismic Transition Zone

Science / Geology / Seismic Transition Zone: A seismic discontinuity, found in all parts of the Earth, at which the velocity increases rapidly with depth: especially the one at 300 to 600 kilometers. MORE

Seismicity

Science / Geology / Seismicity: The study of the worldwide distribution of earthquakes over time and the probability of an earthquake occurring in a specific location. MORE

Seismic Surface Wave

Science / Geology / Seismic Surface Wave: A seismic wave that follows the earth's surface only, with a speed less than that of S-waves. There are Raleigh waves (forward and vertical vibrations) and Love waves (transverse vibrations). MORE

Seismic Refraction

Science / Geology / Seismic Refraction: A mode of seismic prospecting in which the seismic profile is examined for waves that have been refracted upward from seismic discontinuities below the profile. Greater depths may be reached than thro MORE

Seismic Discontinuity

Science / Geology / Seismic Discontinuity: A surface within the Earth across which P-wave or S-wave velocities change rapidly, usually by more than +~0.2 kilometer/second. MORE

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