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Plumbbob Rainier was detonated at 899 ft (274 m) underground on 19 September 1957. [17] The 1.7 kt explosion was the first to be entirely contained underground, producing no fallout. [20] The test took place in a 1,600 [21] to 2,000 ft [22] (500 to 600 m) horizontal tunnel in the shape of a hook. [22]
A subsidence crater is a hole or depression left on the surface of an area which has had an underground (usually nuclear) explosion. Many such craters are commonly present at bomb testing areas; one notable example is the Nevada Test Site , which was historically used for nuclear weapons testing over a period of 41 years.
Subsidence frequently causes major problems in karst terrains, where dissolution of limestone by fluid flow in the subsurface creates voids (i.e., caves).If the roof of a void becomes too weak, it can collapse and the overlying rock and earth will fall into the space, causing subsidence at the surface.
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Production, conservation, sale, and distribution of helium for essential government activities. Respirator guidelines, and after the Hawks Nest Tunnel Disaster, respirator regulation and approval. [1] The first director of the USBM was Joseph Austin Holmes, a pioneer in occupational safety and health. He served from 1910 until his death in 1915 ...
Groundwater-related subsidence is the subsidence (or the sinking) of land resulting from unsustainable groundwater extraction.It is a growing problem in the developing world as cities increase in population and water use, without adequate pumping regulation and enforcement.
(Reuters) -Los Angeles-based asset management firms overseeing more than $4 trillion in assets are grappling with the impact of the region's destructive wildfires on their operations, with some ...