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  2. Brush hog - Wikipedia

    en.wikipedia.org/wiki/Brush_hog

    Two archetypes of this type of mower are the Bush Hog which is made by Bush Hog, Inc. [1] of Selma, Alabama, and the Flex-Wing by RhinoAg of Gibson City, Illinois.The formal name for this type of implement is a rotary cutter or rotary mower, although it differs from mowers in that it does not cut with a sharp blade, but rather severs with an intentionally very dull wedge-like blade.

  3. Earthquake map - Wikipedia

    en.wikipedia.org/wiki/Earthquake_map

    Thurston's earthquake theorem states that for any two points x, y of a Teichmüller space there is a unique left earthquake from x to y.It was proved by William Thurston in a course in Princeton in 1976–1977, but at the time he did not publish it, and the first published statement and proof was given by Kerckhoff (1983), who used it to solve the Nielsen realization problem.

  4. Focal mechanism - Wikipedia

    en.wikipedia.org/wiki/Focal_mechanism

    The moment tensor solution is displayed graphically using a so-called beachball diagram. The pattern of energy radiated during an earthquake with a single direction of motion on a single fault plane may be modelled as a double couple, which is described mathematically as a special case of a second order tensor (similar to those for stress and strain) known as the moment tensor.

  5. Earthquake-resistant structures - Wikipedia

    en.wikipedia.org/wiki/Earthquake-resistant...

    Earthquake-resistant or aseismic structures are designed to protect buildings to some or greater extent from earthquakes. While no structure can be entirely impervious to earthquake damage, the goal of earthquake engineering is to erect structures that fare better during seismic activity than their

  6. Seismogram - Wikipedia

    en.wikipedia.org/wiki/Seismogram

    Time marks show when the earthquake occurred. Time is shown by half-hour (thirty-minute) units. Each rotation of the seismograph drum is thirty minutes. Therefore, on seismograms, each line measures thirty minutes. This is a more efficient way to read a seismogram. Secondly, there are the minute-marks.

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  9. Seismic refraction - Wikipedia

    en.wikipedia.org/wiki/Seismic_refraction

    P-wave refraction evaluates the compression wave generated by the seismic source located at a known distance from the array. The wave is generated by vertically striking a striker plate with a sledgehammer, shooting a seismic shotgun into the ground, or detonating an explosive charge in the ground.