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Example A - Spreading Ridges and Transform Fault

In example A (shown below),

there are two segments of mid-ocean ridge with a transform fault between them. I have indicated, using heavy arrows, that there is spreading going on with the left plate moving left, away from the spreading centers. However, since these are spreading segments, the other side is also moving away from the center, to the right in this case. You should draw the skinny arrows on the right side, pointing away from the spreading centers.

At the transform fault, there is a sliding motion, with the upper block sliding to the right, and the lower block sliding to the left. This is marked by two arrows, one on top of the other, pointing in opposite directions. That is how to mark an active transform fault.

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Greg Anderson
Thu Jan 30 16:29:24 PST 1997