The effect of an earthquake on a river that runs perpendicular to the fault is, the two parts of the river might slide horizontally in opposite
directions.
What is fault?
A fault is a fracture or discontinuity on earth's surface.
It occurs in a volume of rock across which there has been significant displacement as a result of rock-mass movements.
From the given diagram, a river that runs perpendicular to the fault might slide horizontally in opposite directions during the event of earthquake.
Thus, the effect of an earthquake on a river that runs perpendicular to the fault is, the two parts of the river might slide horizontally in opposite
directions.
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