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as it applies itself to things which precede and are better, wherefore
A member of a group for less than half the number of days of the tax year that precede December 31, even if it is a member on December 31; 2.
In studies of past foreshocks, seismologists have not succeeded in detecting any discriminating characteristic that could serve as the basis for identifying which jolt precedes a larger quake.
But other types of magnetic activity, which take place at higher latitudes - closer to the poles - precede sunspot formation, Altrock asserts.
If they can establish that certain noticeable patterns of magnetic signals precede quakes, then magnetometers might prove to be useful tools for predicting an earthquake months to days ahead of time.