Submarine Outcrop Evidence for Transpressional Deformation Within the Nankai Accretionary Prism, Tenryu Canyon, Japan - Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin - page 209

orientation as the result of tight folding associated with slip along the Tokai thrust.
The northern portion of the 1057 dive track crossed the nose of a broad antiformal
fold, with strata dipping away from the dive track on both sides. Thus, the 1057 dive
track crossed a broad synform-antiform pair within a broad Tokai thrust zone. By
comparison, Dive 1058 crossed very simple geology, with persistently northeast
and shallowly dipping strata.
A revelatory observation comes from plotting the strike and dip data from the
three dives (Table 1 ) on lower-hemisphere, equal area stereographic projections
(Fig. 8 ). The poles to bedding measurements from Dive 1056 plot as a crudely
Fig. 8 Stereoplots of poles to bedding ( black dots ) and p-axis ( red square ) for structural data
collected during dives 1056, 1057, and 1058 in Tenryu Canyon. These data are presented within
the context of a series of schematic, block diagrams highlighting inferred structural trends. Strata
observed during dive #1058 are generally flat lying. Bedding data collected during Dives #1056
and #1057 define regional folds. Poles to bedding from Drive #1056 track a girdle distribution
around a great circle, whereas poles to bedding from Dive #1507 plot on opposite sides of the
stereonet. Note the difference in orientation of the p-axis between all three dives