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A fathom = 6 feet or 1.8288 metres, is a unit of length in the old imperial and the U.S. customary systems, used especially for measuring the depth of water.There are two yards (6 feet) in an imperial fathom.ne fathom is equal to: 1  1.8288 metres exactly (1 metre is about 0.5468 fathoms). 2  2 yards (1 yard is exactly 1/2 of a fathom). 3  6 feet (1 foot is exactly 1/6 of a fathom).
The top map is for all depths and the bottom map is for events with focal depths greater than 100 km for all magnitude events. (from Stein and Wysession, 2003). Although most seismicity is shallow, less than 100 km in depth, in some regions of the Earth, seismicity can reach depths of greater than 600 km. These regions are called subduction zones and are thought to represent places where oceanic crust descends or sinks into the mantle.