Classic paper on earthquake mechanisms and nature of faulting on the Mid-
Atlantic Ridge which established beyond a doubt the nature of motion of
transform faults on ridge systems. This was a major proof of the Theory of Plate
Tectonics. Sykes was at the ESSA (forerunner of NOAA) Institute for Earth Sci
ences and used data from the C&GS World-Wide Standardized Seismograph Network.