The dilatancy theory arose after seismologists noticed that in the months before several earthquakes, compressional waves in the vicinity the quake site slowed down, then speeded up again (Science News).
Useful english dictionary. 2012.
dilatancy theory — /daɪˈleɪtənsi θɪəri/ (say duy laytuhnsee thearree) noun a theory for predicting earthquakes which depends upon measurements of wave motions set up when rocks dilate …
earthquake — /errth kwayk /, n. 1. a series of vibrations induced in the earth s crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2. something that is severely disruptive; upheaval. [1300 50; ME erthequake … Universalium
Dilatant — A dilatant (also termed shear thickening) material is one in which viscosity increases with the rate of shear strain. Such a shear thickening fluid, also known by the acronym STF, is an example of a non Newtonian fluid. Comparison of the behavior … Wikipedia
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