If there is no vertical offset between two parts of an offset bed, the throw is?

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Multiple Choice

If there is no vertical offset between two parts of an offset bed, the throw is?

Explanation:
Throw is the vertical displacement of one side of a fault relative to the other, as observed in the bed. When there is no vertical offset between the two parts of an offset bed, there is no upward or downward movement to measure, so the vertical displacement is zero. In that situation the fault may still shift laterally (a pure strike-slip component), but that horizontal movement doesn’t affect the vertical throw. So the value is zero, not undefined, infinite, or negative.

Throw is the vertical displacement of one side of a fault relative to the other, as observed in the bed. When there is no vertical offset between the two parts of an offset bed, there is no upward or downward movement to measure, so the vertical displacement is zero. In that situation the fault may still shift laterally (a pure strike-slip component), but that horizontal movement doesn’t affect the vertical throw. So the value is zero, not undefined, infinite, or negative.

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