High-density surveys conducted to reveal active deformations of the upper forearc slope along the Ryukyu Trench, western Pacific, Japan

• DOI: 10.1186/s40645-018-0199-0
• Publication Date: 2018-08-24T09:40:27Z
• Authors: Kohsaku Arai; Takahiko Inoue; Tomoyuki Sato
• Keywords: Forearc; Island arc; Pacific Plate

In this study, which was conducted to investigate present-day geological deformations occurring off the central Ryukyu Arc along Trench (Okinawa-jima) in vicinity of Japan, we obtained and examined dense, high-resolution, 2D grid (high-density) multichannel seismic reflection data. The forearc slope lacks a large basin but has steep narrow that dips southeast direction opposite plate convergence. However, while profiles our investigation do not reveal any active structures indicative compressional stress convergent subduction zone, recent tectonic are characterized by normal faults strike perpendicular axis. Examinations high-density data show relative motion overriding resulted an active, arc-parallel extensional field. Furthermore, results observations indicate two stages beneath from back-arc rifting Okinawa Trough.