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When Small Earthquakes: Much work remains to be done before we are in a position to conclude whether earthquake prediction is possible. It may be possible, however, to trigger imminent earthquakes before they appear without knowing what causes them. A series of small earthquakes was apparently man-made near Denver, Colo., between 1962 and 1966, when small earthquakes liquid wastes containing radioactive material were pumped down a very deep well and forced into the pores of the surrounding rocks. Possibly the liquid created enough pressure in the rocks to unlock faults, releasing accumulated strains in the form of small earthquakes. This method of inducing small earthquakes may offer a way to forestall really large disasters.
Recent research indicates that it may now be possible to control earthquakes. In the mid-1960s, the dumping of water-based waste into a well in Denver, Colorado, set up a series of small earthquakes. Thus the idea was born that by drilling deep holes along a fault, and then pumping water down, it might be possible to relieve strains in a series of small, non-destructive earthquakes instead of allowing them to build up until a major earthquake occurs [8].
A detectable earthquake occurs every 30 seconds. Fortunately, severe and damaging earthquakes are far less frequent. Since 1897 there has been an average of 16 severe earthquakes a year; that is, earthquakes with a rating.
The year 1967 was unusual in that only six major earthquakes occurred, and up until May 1968 there had been no earthquakes of intensity greater than 8 on the Richter scale since the catastrophic Alaskan earthquake of March 27, 1964, which caused the deaths of 121 people.
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