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  2. Bird's Head plate - Wikipedia

    en.wikipedia.org/wiki/Bird's_Head_Plate

    The Bird's Head plate is a minor tectonic plate incorporating the Bird's Head Peninsula, at the western end of the island of New Guinea.Hillis and Müller consider it to be moving in unison with the Pacific plate. [1]

  3. Seismic retrofit - Wikipedia

    en.wikipedia.org/wiki/Seismic_retrofit

    Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes.With better understanding of seismic demand on structures and with recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged.

  4. Seismic base isolation - Wikipedia

    en.wikipedia.org/wiki/Seismic_base_isolation

    Through the George E. Brown, Jr. Network for Earthquake Engineering Simulation (), researchers are studying the performance of base isolation systems. [16]The project, a collaboration among researchers at University of Nevada, Reno; University of California, Berkeley; University of Wisconsin, Green Bay; and the University at Buffalo is conducting a strategic assessment of the economic ...

  5. Subsoiler - Wikipedia

    en.wikipedia.org/wiki/Subsoiler

    The design provides deep tillage, loosening soil deeper than a tiller or plough is capable of reaching. Agricultural subsoilers, according to the Unverferth Company, can disrupt hardpan ground down to 60 cm (24 in) depths. [1] [2] The subsoiler consists of three or more heavy vertical shanks (standards) mounted on a toolbar or frame with shear ...

  6. Eastern span replacement of the San Francisco–Oakland Bay ...

    en.wikipedia.org/wiki/Eastern_span_replacement_of...

    The earthquake measured 6.9 on the moment magnitude scale and while the epicenter was distant from the bridge, a 50-foot (15 m) section of the upper deck of the eastern truss viaduct portion of the bridge collapsed onto the deck below, indirectly resulting in one death at the point of collapse.

  7. Plough - Wikipedia

    en.wikipedia.org/wiki/Plough

    Tomato tiller. Chisel ploughs are becoming more popular as a primary tillage tool in row-crop farming areas. Basically the chisel plough is a heavy-duty field cultivator intended to operate at depths from 15 cm (5.9 in) to as much as 46 cm (18 in). However some models may run much deeper.

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