- Subsidence crater
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 present at the
Nevada Test Site, which is no longer in use for nuclear testing.
Subsidence craters are created as the roof of the cavity caused by the
explosioncollapses. This causes the surface to depress into a sink (which subsidence craters are sometimes called). It is possible for further collapse to occur from the sink into the explosion chamber. When this collapse reaches the surface, and the chamber is exposed atmospherically to the surface, it is referred to as a "chimney".
It is at the point that a chimney is formed through which radioactive fallout may reach the surface. At the Nevada Test Site, depths of convert|100|to|500|m|ft|sp=us were used for tests.
When a drilling oil well encounters high-pressured gas which cannot be contained either by the weight of the drilling mud or by blow-out preventers, the resulting violent eruption can create a large crater which can swallow up a drilling rig. This phenomenon is called "cratering" in oil field slang.
Underground nuclear testing
Chagan (nuclear test)
Sedan (nuclear test)
* [http://www.nv.doe.gov/news&pubs/photos&films/Images/photolib/8X10/NF474.jpgDOE Image of NTS's many subsidence craters]
* [http://www.nv.doe.gov/library/photos/craters.aspx Crater at DOE site]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Crater — may refer to: In landforms: Impact crater, caused by two celestial bodies impacting each other, such as a meteorite hitting a planet Volcanic crater or caldera, formed by volcanic activity Subsidence crater, from an underground (usually nuclear)… … Wikipedia
Crater depth — The depth of any crater in a solid planet or moon whether it is an impact crater, a volcanic crater, or a subsidence crater may be measured from the local surface to the bottom of the crater, or from the rim of the crater to the bottom. Crater… … Wikipedia
Crater Lake — For other uses, see Crater Lake (disambiguation). Crater Lake Aerial view; note Wizard Island against the western rim … Wikipedia
Pit crater — A pit crater (also called a subsidence crater) is a depression formed by a sinking of the ground surface lying above a void or empty chamber, rather than by the eruption of a volcano or lava vent. [cite web… … Wikipedia
Chicxulub crater — Imaging from NASA s Shuttle Radar Topography Mission STS 99 reveals part of the 180 kilometer (112 mi) diameter ring of the crater; clustered around the crater s trough are numerous sinkholes, suggesting a prehistoric oceanic basin in… … Wikipedia
solution subsidence — 1. Any subsidence due to solution of underlying rock but particularly the subsidence of parts of a formation into hollows or pockets of an immediately underlying soluble formation . 2. A crater like doline in rock other than karst… … Lexicon of Cave and Karst Terminology
Underground nuclear testing — Preparation for an underground nuclear test at the Nevada Test Site in the 1990s. Nuclear weapons … Wikipedia
Yucca Flat — is a closed desert drainage basin, one of four major nuclear test regions within the Nevada Test Site (NTS), and is divided into nine test sections: Areas 1 through 4 and 6 through 10. Yucca Flat is located at the eastern edge of NTS, about ten… … Wikipedia
Lava — flow redirects here. For the programming anti pattern, see Lava flow (programming). For other uses, see Lava (disambiguation) … Wikipedia
Nevada Test Site — Infobox Military Test Site name= Nevada Test Site caption= November 1951 nuclear test at Nevada Test Site. Test is shot Dog from Operation Buster, with a yield of 21 kilotons. It was the first U.S. nuclear field exercise conducted on land; troops … Wikipedia