Fetch refers to the area of the sea over which the wind blows.
Explanation:
Fetch refers to the maximum distance of water which indicates how far the wind has traveled over open water. It is also the topmost length of open water over which the wind blows. Fetch can also be said to be a measurement of distance over which the winds can blow. It is a very important factor in the formation, size and power of waves.
I would say these would be transform boundaries where the tectonic energy appears to be transformed from one plate to another such as off the coast of Guatemala so it is not a simple process of subduction,.