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 206

Fig. 5 Oblique, southerly view south of overturned antiformal stack within the Tokai thrust zone
from Dive 1057 (see text and Fig. 7 for details). Bedding is approximately 20 cm thick

outcrop-scale faulting relationships were observed, including thrust faults and synde-
positional and post-depositional normal faults. A few outcrops on Dive 1058 con-
tained strike-slip faults (Fig. 4e, f ). The most complex outcrop-scale structures occur
in the imbricate zone of the Tokai thrust imaged during Dive 1057. These exposures
include an overturned antiformal stack of gently folded, fault-bound imbricates that
provides an unparalleled potential window into the structural style of the region
(Fig. 5 ). In the following section, we draw on these and other outcrop observations to
document map-scale evidence for trench-parallel shortening.

4 Dive-Transect Maps

By systematically measuring strikes and dips from dive video collected along the
dive tracks, we were able to construct two structural maps that illustrate the attitude
of bedding, joints, and faults. Dive 1056 encountered a largely homoclinal sequence