Answer Posted / krishh

Generally earthquakes occur only when there is a gap or
vaccum between 2 layers underneath.there are many reasons
for a earth quake to occur, but here in this case we take
in reason told above.'a' stands for the area under which
the vaccum occurs,and 'w' stands for the weight of the part
under which vaccum is created, and that part is pulled by
earth's gravity,so the base shear force is (area/weight of
the part)multiplied by the gravity of the earth(9.8).

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