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  2. 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.

  3. Seismic wave - Wikipedia

    en.wikipedia.org/wiki/Seismic_wave

    The path that a wave takes between the focus and the observation point is often drawn as a ray diagram. Each path is denoted by a set of letters that describe the trajectory and phase through the Earth. In general, an upper case denotes a transmitted wave and a lower case denotes a reflected wave. The two exceptions to this seem to be "g" and "n".

  4. Earthquake shaking table - Wikipedia

    en.wikipedia.org/wiki/Earthquake_shaking_table

    Earthquake shaking tables are essential in model testing contests, where participants evaluate designs developed within specific guidelines against simulated seismic activity. [5] Simple shake tables are also used in architecture and structural engineering primarily for educational purposes, helping students learn how structures respond to ...

  5. 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.

  6. Wheel tractor-scraper - Wikipedia

    en.wikipedia.org/wiki/Wheel_tractor-scraper

    The push-pull attachment allows two individual scrapers to act as a self-loading system, typically loading both machines in less than a minute, one after the other. Auger: uses vertically mounted auger in the bowl to pull material upwards. Pull type scraper: uses agricultural tractor, articulated dump truck, or bulldozer to pull.

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