Fig. 8
a Seismic reflection images of the back-arc basin along the RK02 profile and b its interpretation. In this image, normal faults are densely developed at 1–3-km intervals on the western part of the basin (black lines). In most cases, displacements along the faults reach the seafloor and form half-graben structures, suggesting these faults are young or still active. The normal faults consistently dip eastward and produce rotated blocks, indicating an asymmetric rifting style in the basin (see text for discussions). On the eastern part of the basin, the sedimentary layers are highly deformed by crosscutting faults (blue lines and arrows)