Abstract
Summary A total magnetic intensity map covering the area between latitudes 32° and 36° N and longitudes 121° and 128° W is presented. It shows a series of narrow anomalies of about 400 γ amplitude trending northsouth for 300 miles over a substantially flat abyssal plain. Some possible interpretations are discussed. The anomalies arise at shallow depths beneath the ocean bottom and are consistent with the presence of relatively thin layers of magnetized material overlying a less magnetic crust; they could equally well arise from topography of the upper surface of a continuous magnetic basement for the most part concealed by an overlying blanket of sediments. The anomalies are intersected by the Murray fracture zone, which interrupts their pattern in such a way as to suggest a right lateral displacement of about 84 nautical miles.
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