Wide-angle seismic experiment crossing the Sofu-gan tectonic line in the Izu-Ogasawara arc –KY0507 cruise–

抄録

We conducted a wide-angle seismic experiment using a large volume (200l) airgun array and 110 ocean bottom seismographs (OBSs) in the central and southern Izu-Ogasawara region. The experiment was KY05-07 cruise using R/V Kaiyo of Japan Agency for Marine-Earth Science and Technology (JAMSTEC) during July 8 and August 1, 2005. Objectives of the experiment are to reveal a velocity structure of the central and southern Izu-Ogasawara region, and to constrain the structural variation along the profile, especially crossing the Sofu-gan tectonic line. The total shot number of the large volume airgun array was 7300, which were recorded by the OBSs and a 12-ch hydrophone streamer towing simultaneously. In this paper, we summarize information of the experiments and introduce OBS and streamer data.