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  2. Earth auger - Wikipedia

    en.wikipedia.org/wiki/Earth_Auger

    An earth auger, earth drill, or post-hole auger is a drilling tool used for making holes in the ground. [1] It typically consists of a rotating vertical metal rod or pipe with one or more blades attached at the lower end, that cut or scrape the soil.

  3. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    The Richter scale [1] (/ ˈ r ɪ k t É™r /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]

  4. Peak ground acceleration - Wikipedia

    en.wikipedia.org/wiki/Peak_ground_acceleration

    In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself. For moderate earthquakes, PGA is a reasonably good determinant of damage; in severe earthquakes, damage is more often correlated with peak ground velocity .

  5. Tractor PTO auger - Wikipedia

    en.wikipedia.org/wiki/Tractor_PTO_auger

    This in turn will provide power to the Tractor PTO Auger's gearbox. Most modern [1] Tractor PTO Auger gearboxes come standard with a shear bolt to protect the gear drive if the auger encounters an obstruction such as rock during drilling a hole. Tractor PTO Augers connect via 3 point hitch to subcompact tractors and mid-size tractors. [2]

  6. Tectonic weapon - Wikipedia

    en.wikipedia.org/wiki/Tectonic_weapon

    Roger Clark, lecturer in geophysics at Leeds University said in the journal Nature in 1996, responding to a newspaper report that there had been two secret Soviet programs, "Mercury" and "Volcano", aimed at developing a "tectonic weapon" that could set off earthquakes from great distance by manipulating electromagnetism, said "We don't think it is impossible, or wrong, but past experience ...

  7. 7.0 earthquake in Northern California knocks out power to ...

    www.aol.com/tsunami-warnings-california-oregon...

    Christine Goulet, the director of the USGS Earthquake Science Center, based in Los Angeles, said the 7.0 earthquake initiated less than a mile beneath the Earth’s surface, making it uncommonly ...

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