Abstract
Abstract The fine structure of the upper part of the crust around a unique trench-trench-trench triple junction (34°10′N, 141°50′E, Fig. 1) off the coast of southeastern Honshu, Japan, was analyzed on the basis of geophysical data. The triple junction is characterized by a triangular shaped 9000 m deep basin with a strong negative free air gravity anomaly, distorted magnetic lineaments and shallow angle sub-bottom faults. Although there is a lack of refraction data, simulation experiments in terms of gravity and magnetics suggest that the topmost part of the lithosphere of the northeastern corner of the Philippine sea plate is stretched to form a wide basin in the triple junction area. No attempt is made to discuss the dynamic structure of the triple junction.
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