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 through seismic reflection.

Refraction (Wave)

Science / Geology / Refraction (Wave): The departure of a wave from its original direction of travel at the interface with a material of different index of refraction (light) or seismic wave velocity (see also Seismic refraction). 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 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

Subrefraction

Science / Weather / Subrefraction: Less than normal bending of light or a radar beam as it passes through a zone of contrasting properties, such as atmospheric density, water vapor, or temperature. MORE

Superrefraction

Science / Weather / Superrefraction: Greater than normal bending of light or radar beam as it passes through a zone of contrasting properties, such as atmospheric density, water vapor, or temperature. 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

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