  A conjecture on imminent earthquake prediction is presented. Drastic
geological deformations of crustal rock strata taking place immediately
(hours/days) before an earthquake may cause fast air or gas emission/absorption
vertically in between ground and sky. I conjecture, inspired by an observation
of strange patterns appearing on shaving foam, that this fast movement of air
fluid may produce unusual cloud patterns at interfaces between atmosphere
levels. This air movement is vertical and drastic, different from the
horizontal and moderate meteorological air movement, hence its caused cloud
patterns are expected to be different from meteorological cloud patterns. This
provides a possible origin for the so-called earthquake cloud. Recognition of
different earthquake cloud patterns may provide a practical way to estimate
location, magnitude and strength of geological deformations of rock strata, and
hence a method with support of physics for imminent earthquake prediction. In
the end of this paper an experiment has been designed to test the conjecture.
